Wei Li has published extensively in international scientific journals and books as well as international conference proceedings. Some of his notable publications include papers on spectral characterization of monolithic mode-locked lasers, superluminescent diodes at 1.55 μm, characterization of 1550 nm Fabry-Perot laser structures, and invited chapters in books on dilute nitride semiconductors and GaInNAs quantum well lasers. He has also published work on extending the emission wavelength of GaInNAs/GaAs quantum well lasers beyond 1300 nm and high performance 1.32 μm GaInNAs/GaAs single-quantum-well lasers.
Efficient charge transfer induced organic/inorganic based hybrid heterojunction of Ppy/GaN nanorods for high-performance self-powered UV photodetection
Percolation of light through whispering gallery modes in 3D lattices of coupl...Shashaanka Ashili
Using techniques of flow-assisted self-assembly we synthesized three-dimensional (3D) lattices of dye-doped fluorescent (FL) 5 μm polystyrene spheres with 3% size dispersion with well controlled thickness from one monolayer up to 43 monolayers. In FL transmission spectra of such lattices we observed signatures of coupling between multiple spheres with nearly resonant whispering gallery modes (WGMs). These include (i)
splitting of the WGM-related peaks with the magnitude 4.0-5.3 nm at the average wavelength 535 nm, (ii) pump dependence of FL transmission showing that the splitting is seen only above the threshold for lasing WGMs, and (iii) anomalously high transmission at the WGM peak
wavelengths compared to the background for samples with thickness around 25 μm. We propose a qualitative interpretation of the observed WGM transport based on an analogy with percolation theory where the sites of the
lattice (spheres) are connected with optical “bonds” which are present with probability depending on the spheres’ size dispersion. We predict that the WGM percolation threshold should be achievable in close packed 3D
lattices formed by cavities with ~103 quality factors of WGMs and with ~1% size dispersion. Such systems can be used for developing next generation of resonant sensors and arrayed-resonator light emitting devices.
Efficient charge transfer induced organic/inorganic based hybrid heterojunction of Ppy/GaN nanorods for high-performance self-powered UV photodetection
Percolation of light through whispering gallery modes in 3D lattices of coupl...Shashaanka Ashili
Using techniques of flow-assisted self-assembly we synthesized three-dimensional (3D) lattices of dye-doped fluorescent (FL) 5 μm polystyrene spheres with 3% size dispersion with well controlled thickness from one monolayer up to 43 monolayers. In FL transmission spectra of such lattices we observed signatures of coupling between multiple spheres with nearly resonant whispering gallery modes (WGMs). These include (i)
splitting of the WGM-related peaks with the magnitude 4.0-5.3 nm at the average wavelength 535 nm, (ii) pump dependence of FL transmission showing that the splitting is seen only above the threshold for lasing WGMs, and (iii) anomalously high transmission at the WGM peak
wavelengths compared to the background for samples with thickness around 25 μm. We propose a qualitative interpretation of the observed WGM transport based on an analogy with percolation theory where the sites of the
lattice (spheres) are connected with optical “bonds” which are present with probability depending on the spheres’ size dispersion. We predict that the WGM percolation threshold should be achievable in close packed 3D
lattices formed by cavities with ~103 quality factors of WGMs and with ~1% size dispersion. Such systems can be used for developing next generation of resonant sensors and arrayed-resonator light emitting devices.
Study of Mitotic Index and DNA profile when exposure to He-Ne laser and UVC r...IOSR Journals
In vitro, He-Ne laser show a modifying response of cells to ionizing radiations. So there is a need to show the effect of He-Ne laser (632.8nm), Ultraviolet radiation UVC (250nm) and He-Ne laser pre and post irradiation against the UVC radiation of Mitotic index of femur and in vivo to DNA of testis in Mice. In this study 100 albino male mice were divided into five groups, the first group Control which have (10) number of mice, the second group Laser which have (27) number of mice were divided into three groups different time periods (5, 10, 15 min), the third group Ultraviolet radiation (UVC) which have (9) number of mice and duration of exposure one hour, the fourth group laser (5, 10 and 15 min) + UVC (1h) which have (27) number of mice, with ½ hour time interval between the two irradiations and the finally group UVC (1h) + laser (5, 10, 15 min) which have (27) number of mice, with ½ hour time interval between the two irradiations was monitor the effect of radiation on mice according to the classification totals above after various time periods (7, 14, 21 days). Mitotic index as shown increase the percentage of Mononucleus and less increase of Dinucleus after exposure of the radiation according to the classification totals above. The He-Ne laser per-irradiation show a protection properties, which appeared the DNA damage against UVC light irradiation. But the He-Ne laser pre-irradiation against UVC irradiation farther more reduce the DNA testis damaging. UVC shows a damaging effect on the DNA. This damage was reduced by the He-Ne laser pre- irradiation. Thus Laser pre-irradiation may be attributed to the induction of endogenous of radio protectors or which may be involved in DNA damage repair.
APS D63.00002 Tight Binding Simulation of Finite Temperature Electronic Struc...DavidAbramovitch1
Abstract: D63.00002 : Improved Accuracy Tight Binding Model for Finite Temperature Electronic Structure Dynamics in Methyl Ammonium Lead Iodide (MAPbI3)
Presenter:
David Abramovitch
(Department of Physics, University of California, Berkeley)
Authors:
David Abramovitch
(Department of Physics, University of California, Berkeley)
Liang Tan
(Molecular Foundry, Lawrence Berkeley National Lab)
Halide perovskites are promising photovoltaic and optoelectronic materials. However, computing electronic properties and dynamics at finite temperature is challenging due to nonlinear lattice dynamics and prohibitive computational costs for ab initio methods. Tight binding models decrease computational costs, but current models lack the ability to accurately model instantaneous atom displacement and reduced symmetry at finite temperature. We present a parameterized tight binding model for MAPbI3 capable of predicting instantaneous electronic structures for large systems based on atomic positions extracted from classical molecular dynamics. Our tight binding Hamiltonian predicts instantaneous atomic orbital onsite energies and hopping parameters accurate to 0.1 to 0.01 eV compared to DFT across the orthorhombic, tetragonal, and cubic phases, including effects of temperature, reduced symmetry, and spin orbit coupling. This model allows for efficient calculation of instantaneous and dynamical electronic structure at the length and time scales required to address coupled electronic and ionic dynamics, as required for predicting temperature dependence of carrier mass, band structure, free carrier scattering, and polaron transport and recombination.
Cation distribution of Ni2+ and Mg2+ ions improve structure and Magnetic Prop...AI Publications
In the present work, ferromagnetic Ni is slightly substituted for diamagnetic Mg spinal ferrites. The effect of Ni doping on the structural and magnetic properties of ferrites material in the form of NixMg1-xFe2O4 (x = 0.1,0.15,0.2,0.25, .0.3,0.35) has been the study. The Sol-gel auto Combustion method used to combine these substances uses urea as fuel. Sintered samples were shown using X-ray diffraction, Fourier Transform Infrared spectroscopy (FTIR) and a vibrating magnetometer sample. X-ray diffraction revealed that all the composite samples were pure cubic spinel arrays with a Fd3m space band and a permanent lattice that varied with Ni concentrations. the distribution of Ni2 + ions and Mg2+ ions in spinel ferrites indicates various changes in parameters such as tetrahedral ionic radius (rA), octahedral ionic radius (rB), hopping length (LA and LB). Fourier Transform Infrared (FT-IR) simulations showed wire vibration at the tetrahedral site and Octahedral site. spinel ferrites M-H curves are recorded at room temperature indicating normal hysteresis loop indicating the magnetic field.
Dr. Patrick Bradshaw presents an overview of his program, Human Performance and Biosystems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Mitat A. Birkan presents an overview of his program, Space Propulsion and Power, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Plenary lecture - XV B-MRS Meeting - Campinas, SP, Brazil - September, 25 to 29, 2016.
Author: Elvira Fortunato (CENIMAT, Universidade Nova de Lisboa, Portugal).
Study of Mitotic Index and DNA profile when exposure to He-Ne laser and UVC r...IOSR Journals
In vitro, He-Ne laser show a modifying response of cells to ionizing radiations. So there is a need to show the effect of He-Ne laser (632.8nm), Ultraviolet radiation UVC (250nm) and He-Ne laser pre and post irradiation against the UVC radiation of Mitotic index of femur and in vivo to DNA of testis in Mice. In this study 100 albino male mice were divided into five groups, the first group Control which have (10) number of mice, the second group Laser which have (27) number of mice were divided into three groups different time periods (5, 10, 15 min), the third group Ultraviolet radiation (UVC) which have (9) number of mice and duration of exposure one hour, the fourth group laser (5, 10 and 15 min) + UVC (1h) which have (27) number of mice, with ½ hour time interval between the two irradiations and the finally group UVC (1h) + laser (5, 10, 15 min) which have (27) number of mice, with ½ hour time interval between the two irradiations was monitor the effect of radiation on mice according to the classification totals above after various time periods (7, 14, 21 days). Mitotic index as shown increase the percentage of Mononucleus and less increase of Dinucleus after exposure of the radiation according to the classification totals above. The He-Ne laser per-irradiation show a protection properties, which appeared the DNA damage against UVC light irradiation. But the He-Ne laser pre-irradiation against UVC irradiation farther more reduce the DNA testis damaging. UVC shows a damaging effect on the DNA. This damage was reduced by the He-Ne laser pre- irradiation. Thus Laser pre-irradiation may be attributed to the induction of endogenous of radio protectors or which may be involved in DNA damage repair.
APS D63.00002 Tight Binding Simulation of Finite Temperature Electronic Struc...DavidAbramovitch1
Abstract: D63.00002 : Improved Accuracy Tight Binding Model for Finite Temperature Electronic Structure Dynamics in Methyl Ammonium Lead Iodide (MAPbI3)
Presenter:
David Abramovitch
(Department of Physics, University of California, Berkeley)
Authors:
David Abramovitch
(Department of Physics, University of California, Berkeley)
Liang Tan
(Molecular Foundry, Lawrence Berkeley National Lab)
Halide perovskites are promising photovoltaic and optoelectronic materials. However, computing electronic properties and dynamics at finite temperature is challenging due to nonlinear lattice dynamics and prohibitive computational costs for ab initio methods. Tight binding models decrease computational costs, but current models lack the ability to accurately model instantaneous atom displacement and reduced symmetry at finite temperature. We present a parameterized tight binding model for MAPbI3 capable of predicting instantaneous electronic structures for large systems based on atomic positions extracted from classical molecular dynamics. Our tight binding Hamiltonian predicts instantaneous atomic orbital onsite energies and hopping parameters accurate to 0.1 to 0.01 eV compared to DFT across the orthorhombic, tetragonal, and cubic phases, including effects of temperature, reduced symmetry, and spin orbit coupling. This model allows for efficient calculation of instantaneous and dynamical electronic structure at the length and time scales required to address coupled electronic and ionic dynamics, as required for predicting temperature dependence of carrier mass, band structure, free carrier scattering, and polaron transport and recombination.
Cation distribution of Ni2+ and Mg2+ ions improve structure and Magnetic Prop...AI Publications
In the present work, ferromagnetic Ni is slightly substituted for diamagnetic Mg spinal ferrites. The effect of Ni doping on the structural and magnetic properties of ferrites material in the form of NixMg1-xFe2O4 (x = 0.1,0.15,0.2,0.25, .0.3,0.35) has been the study. The Sol-gel auto Combustion method used to combine these substances uses urea as fuel. Sintered samples were shown using X-ray diffraction, Fourier Transform Infrared spectroscopy (FTIR) and a vibrating magnetometer sample. X-ray diffraction revealed that all the composite samples were pure cubic spinel arrays with a Fd3m space band and a permanent lattice that varied with Ni concentrations. the distribution of Ni2 + ions and Mg2+ ions in spinel ferrites indicates various changes in parameters such as tetrahedral ionic radius (rA), octahedral ionic radius (rB), hopping length (LA and LB). Fourier Transform Infrared (FT-IR) simulations showed wire vibration at the tetrahedral site and Octahedral site. spinel ferrites M-H curves are recorded at room temperature indicating normal hysteresis loop indicating the magnetic field.
Dr. Patrick Bradshaw presents an overview of his program, Human Performance and Biosystems, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Dr. Mitat A. Birkan presents an overview of his program, Space Propulsion and Power, at the AFOSR 2013 Spring Review. At this review, Program Officers from AFOSR Technical Divisions will present briefings that highlight basic research programs beneficial to the Air Force.
Plenary lecture - XV B-MRS Meeting - Campinas, SP, Brazil - September, 25 to 29, 2016.
Author: Elvira Fortunato (CENIMAT, Universidade Nova de Lisboa, Portugal).
This presentation reviews the following paper.
Giannini, Vincenzo, Antonio I. Fernández-Domínguez, Susannah C. Heck, and Stefan A. Maier. "Plasmonic nanoantennas: fundamentals and their use in controlling the radiative properties of nanoemitters." Chemical reviews 111, no. 6 (2011): 3888-3912.
Multiprocess passive diffusion driven nano ion filter and brownian motion bat...Michael Changaris
Multiple new developments in physical principals allow for amplification of energy storage through passive and chemically driven process.
Membrane ion selectivity can allow for passive diffusion driven energy storage.
Light and heat can increase rate of Brownian motion enhancing the diffusion gradient and driving ion charge independently (e.g. heat differential in lightning production).
Graphene can organize in a single sheet possibly allowing for more effective harnessing of the ratchet that can drive browning motion into mechanical action.
Ion pumps driven by Nano properties can create ion specific transport driving energy storage and maintaining energy with slower decay.
Chemical cascades if appropriately directed can create a stable far from equilibrium system in which the byproduct of one reaction becomes the catalyst for the next step.
With sufficient complexity and properties of phase shift these cascades can drive each other through interacting oscillatory patterns for the life of the battery and time for needed for energy storage.
IA Literature Review on Synthesis and Characterization of enamelled copper wi...Editor IJCATR
This paper discusses about the survey on the various magazines, conference papers and journals for understanding the
properties of enamelled copper wires mixed with nano fillers, fundamental methods for synthesis and characterization of carbon
nanotubes. From all these papers, it was noted that the research work carried out in an enamelled copper wires filled with nano fillers
has shown better results. It was also recorded that the research work was carried mostly with single metal catalysts and very little
amount of research work has been carried out on the synthesis of carbon nanotubes using bimetallic catalysts.
The effect of core destabilisation on the mechanical resistance of i27John Clarkson
D.J. Brockwell, G.S. Beddard, J. Clarkson, R.C. Zinober, A.W. Blake, J. Trinick, P.D. Olmsted, D.A. Smith & S.E. Radford, “The Effect of Core Destabilisation on the Mechanical Resistance of I27”, Biophys. J., 83(1), 472-483, 2002.
1. Wei Li
发表的论文:
A. International scientific journals & books:
1) P. Acedo, H. Lamela, S. Garidel, C. Roda, J.P. Vilcot, G. Carpintero, I.H. White, K. A.
Williams, M. Thompson, W. Li, M. Pessa, M. Dumitrescu and S. Hansmann “Spectral
Characterization of Monolithic Mode-locked Lasers for mm-wave generation and signal
processing” Electronics Letters, 42, pp. 928-929, 2006.
2) Wei Li, R. Rönkkö, A. Rydefalk, P. Pöyhönen, M. Pessa, Superluminescent diodes at
1.55 µm based on quantum-well and quantum-dot active regions Superluminescence
LED, SPIE 5739, pp. 116-121 (2005).
3) Wei Li, R. Rönkkö, M. Peltola, A. Rydefalk, M. Pessa, H. Schöll, S. Garidel. A.
Williams, P. Moreno, H. Lamela, M. Cavallari, Characterization of 1550 nm Fabry-Perot
Laser Structures for Application as Mode-Locked Pulse Sources, SPIE 5452, pp. 130-137
(2004).
4) Wei Li, M. Pessa, Invited Chapter in the book “Dilute Nitride Semiconductors for
Optoelectronic Devices” of the book “Handbook of Semiconductor Nanostructures and
Devices, published in 2005 by American Scientific Publishers.
5) Wei Li, M. Pessa, T. Jouhti, C.S. Peng, E.-M. Pavelescu, Invited chapter "GaInNAs
quantum well laser" in Encyclopedia of Nanoscience and Nanotechnology published in
2004 by American Scientific Publishers, vol.3, page 719-730.
6) Wei Li, J. Konttinen, T. Jouhti, C.S. Peng, E.-M. Pavelescu, M. Suominen, M. Pessa,
Extending the emission wavelength of GaInNAs/GaAs quantum well lasers beyond 1300
nm, in the book “Advanced Nanomaterials and Nanodevices” published by the Institute
of Physics Publishing 2003, pp. 251-260 (2003).
7) Wei Li, C.S. Peng, T. Jouhti, J. Konttinen, E.-M. Pavelescu, M. Suominen, M.
Dumitrescu, M. Pessa, High performance 1.32 μm GaInNAs/GaAs single-quantum-well
lasers grown by molecular beam epitaxy, SPIE 4651, p101.
8) Wei Li, T. Ahlgren, J. Dekker, M. Pessa, Origin of improved luminescence efficiency
after annealing of Ga(In)NAs materials, SPIE 4650, p207.
9) Wei Li, Tomi Jouhti, Chang Si Peng, Janne Konttinen, Pekka Laukkanen, Emil-Mihai
Pavelescu, Mihail Dumitrescu, and Markus Pessa, Low threshold current 1.32 μm
GaInNAs/GaAs single quantum well lasers grown by molecular beam epitaxy, Appl.
Phys. Lett. 79, 3386(2001).
10) Wei Li, Markus Pessa, Tommy Ahlgren and James Dekker, Origin of improved
luminescence efficiency after annealing of Ga(In)NAs materials grown by molecular
beam epitaxy, Appl. Phys. Lett. 79, 1094(2001).
11) Wei Li, Markus Pessa, Juha Toivonen and Harri Lipsanen, Doping and carrier transport in
GaInNAs alloys, Physical Review B, 64, 113308(2001).
12) Wei Li, Markus Pessa, and Jari Likonen, Lattice parameters of GaAsN: deviation of
Vegard' law. Appl. Phys. Lett. 78, 2864(2001).
13) Wei Li, Jani Turpeinen, Petri Melanen, Pekka Savolainen, Petteri Uusimaa, and Markus
Pessa, Effects of rapid thermal annealing on strain-compensated GaInNAs/GaAsP
quantum well structures and lasers, Appl. Phys. Lett. 78, 91 (2001).
14) Wei Li, Markus Pessa, Lattice contraction in carbon-doped GaAs epilayers, Phys. Rev. B
57, 14627(1998).
2. Wei Li
15) Wei Li, Peder Bergman, Ivan Ivannov, Wei-Xin Ni, H. Amano, I. Akasaki, High-
resolution X-ray analysis of InGaN/GaN superlattices grown on sapphire substrates with
GaN layers, Appl. Phys. Lett. 69, 3390(1996).
16) Wei Li, J. Lammasniemi, A. B. Kazantsev, R. Jaakkola, T. Mäkeläand M. Pessa,
GaInP/AlInP tunnel junction for GaInP/GaAs tandem solar cells, Electron. Lett. 34,
406(1998).
17) Wei Li, Wei-Xin Ni, Residual strain in GaN epilayers grown on sapphire and (6H) SiC
substrates, Appl. Phys. Lett. 68, 2705(1996).
18) Wei Li, Zhanguo Wang, Jiben Liang, Qiwei Liao, Bo Xu, Zhanping Zhu, and Bin Yang,
Investigation of the epitaxial growth of InxGa1-xAs on GaAs (001) and extension of two
dimensional-three dimensional growth mode transition, Appl. Phys. Lett. 66,
1080(1995).
19) Wei Li, Peder Bergman, Bo Monemar, H. Amano, I. Akasaki, Photoluminescence decay
dynamics in an InGaN/GaN/AlGaN single quantum well, J. Appl. Phys. 81, 1005(1997).
20) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Zhiliang Yuan, Jian Li,
Photoluminescence studies of single submonolayer InAs/GaAs structures grown GaAs
(001) matrix, Appl. Phys. Lett. 67, 1874(1995).
21) Wei Li, Zhanguo Wang, Aimin Song, Jiben Liang, Bo Xu, Zhanping Zhu, Wanhua
Zheng, Qiwei Liao, and Bin Yang, Photoluminescence studies of very high-density two-
dimensional electron gases in pseudomorphic modulation-doped quantum wells, J. Appl.
Phys. 78, 593(1995).
22) Wu Ju, Wei Li, T. W. Fan, Z. G. Wang, X. F. Duan, Breaking up of the misfit
dislocations in GaAs/In0.3Ga0.7As/GaAs heterostructures, Appl. Phys. Lett. 67,
846(1995).
23) Wei Li, Jari Likonen, Jouko Haapamaa, Markus Pessa, Be redistribution in GaInP and
growth of GaInP/AlInP tunnel diode by gas source molecular beam epitaxy, J. Cryst.
Growth 209, 459(2000).
24) Wei Li, Jari Likonen, Jouko Haapamaa, Markus Pessa, Study of concentration-dependent
Be diffusion in GaInP layers grown by gas source molecular beam epitaxy, J. Appl.
Phys. 87, 7592(2000).
25) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Optical characterizations of
single submonolayer InAs/GaAs structures grown GaAs (001) matrix, Chinese Physics
Letters 9, 261(1995).
26) Wei Li, Aimin Song, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Wanhua
Zheng, Qiwei Liao, and Bin Yang, Optical properties of highly dense 2DEG modulation-
doped AlGaAs/InGaAs/GaAs quantum well structures, Chinese Physics Letters 11,
758(1994).
27) Wei Li, S. Laaksonen, J. Haapamaa, M. Pessa, Growth of device-quality GaAs layer
directly on (001) Ge by both solid-source and gas-source molecular beam epitaxy, J.
Crystal. Growth 227/228, 104(2001).
28) Wei Li, Jani Turpeinen, Petri Melanen, Pekka Savolainen, Petteri Uusimaa, and Markus
Pessa, Growth of strain-compensated GaInNAs/GaAsP quantum wells for 1.3 um lasers,
J. Crystal. Growth 230, 533(2001).
29) E. Vainonen-Ahlgren, T. Ahlgren, J. Likonen, S. Lehto, J. Keinonen, Wei Li, and J.
Haapamaa, Identification of vacancy charge states in diffusion of arsenic in germanium,
Appl. Phys. Lett. 77, 690(2000).
3. Wei Li
30) Wei Li, Jani Turpeinen, Petri Melanen, Pekka Savolainen, Petteri Uusimaa, and Markus
Pessa, Strain-compensated GaInNAs/GaAsP/GaAs/GaInP quantum well lasers grown by
gas-source molecular beam epitaxy, J. Crystal. Growth 227/228, 541(2001).
31) Chang Si Peng, Tomi Jouhti, Pekka Laukkanen, Emil-Mihai Pavelescu, Janne Konttinen,
Wei Li, and Markus Pessa, 1.32 m GaInNAs-GaAs Laser with a low threshold current
density, IEEE Photon. Technol. Lett. 14, 275(2002).
32) Bin Yang, Zhan-guo Wang, Yong-hai Cheng, Ji-ben Liang, Lan-ying Lin, Zhan-ping
Zhu, Bo Xu, and Wei Li, Influence of DX centers in the AlxGa1-xAs barrier on the low-
temperature density and mobility of the two-dimensional electron gas in GaAs/AlGaAs
modulation-doped heterostructure, Appl. Phys. Lett. 66, 1406(1995).
33) Bin Yang, Yong-hai Cheng, Zhan-guo Wang, Ji-ben Liang, Qi-wei Liao, Lan-ying Lin,
Zhan-ping Zhu, Bo Xu, and Wei Li, Interface roughness scattering in GaAs-AlGaAs
modulation-doped heterostructures, Appl. Phys. Lett. 65, 3329(1994).
34) T. Ahlgren, E. Vainonen-Ahlgren, J. Likonen, Wei Li, and M. Pessa, Concentration of
interstitial and substitutional nitrogen in GaNxAs1–x, Appl. Phys. Lett. 80, 2314(2002).
35) E.-M. Pavelescu, C. S. Peng, T. Jouhti, J. Konttinen, Wei Li, M. Pessa, M. Dumitrescu,
and S. Spânulescu, Effects of insertion of strain-mediating layers on luminescence
properties of 1.3-µm GaInNAs/GaNAs/GaAs quantum-well structures, Appl. Phys. Lett.
80, 3054(2002).
36) B. Monemar, J. P. Bergman, I. A. Buyanova, Wei Li, H. Amano, and I. Akasaki, MRS
Internet J. Nitride Semicond. Res. 1, 2(1996).
37) M. Pessa, C.S. Peng, T. Jouhti, E.-M. Pavelescu, Wei Li, S. Karirinne, H.F. Liu, O.G.
Okhotnikov, Long-wavelength Nitride Lasers on GaAs, Microelectronics Engineering 69,
195(2003).
38) C. S. Peng, Wei Li, T. Jouhti, E.-M. Pavelescu, M. Pessa, A study and control of lattice
sites of N and In/Ga interdiffusion in dilute nitride quantum wells, J. of Cryst. Growth
251, 378(2003). E-MRS 2002 Spring Meeting, Strasbourg, France, June 18-21, 2002.
39) T. Jouhti, C.S. Peng, E.-M. Pavelescu, Wei Li, V.-T. Rangel Kuoppa, J. Konttinen, P.
Laukkanen, M. Pessa, Group III-Arsenide-Nitride Quantum Well Structures on GaAs for
Laser Diodes Emitting at 1.3 μm, SPIE 4651, p32.
40) E. -M. Pavelescu, C. S. Peng, T. Jouhti, J. Konttinen, M. Dumitrescu, Wei Li and M.
Pessa, Enhanced optical and structural properties of strain-compensated 1.3-m
GaInNAs/GaNAs/GaAs quantum-well structures by insertion of strain-mediating layers,
Solid-State Electronics, 47, 507(2003).
41) J. Dekker, J. Oila, K. Saarinen, A. Tukiainen, Wei Li, M. Pessa, Cation and anion
vacancies in proton irradiated GaInP, J. of Appl. Phys. 92, 5942(2002).
42) E.-M. Pavelescu, T. Jouhti, C.S. Peng, Wei Li, J. Konttinen, M. Dumitrescu, P.
Laukkanen, M. Pessa, Enhanced optical performances of strain-compensated 1.3 um
GaInNAs/GaNAs/GaAs quantum-well structures, J. of Cryst. Growth 241, 31(2002).
4. Wei Li
B. International conference proceedings:
1) Wei Li, Jari Likonen, Jouko Haapamaa, Markus Pessa, Be redistribution in GaInP and
growth of GaInP/AlInP tunnel diode by gas source molecular beam epitaxy, 7th
international Conference on Chemical Beam Epitaxy and Related Growth Techniques,
Tsukuba, Japan, 1994.
2) Wei Li, J.Lammasniemi, A. B. Kazantsev, R. Jaakkola, T. Mäkeläand M. Pessa, MBE
grown GaInP/AlInP tunnel junctions for GaInP/GaAs tandem solar cells, 2nd World
Conference and Exhibition on Photovoltaic Solar Energy Conversion, 1998, Vienna,
Austria, p3614.
3) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Optical studies of single
submonolayer InAs/GaAs structures grown GaAs (001) substrates, 1995 Electronic
Material Conference, U.S.A.
4) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Investigation of MBE
growth of highly strained InGaAs on GaAs, 1994 MSSS, Japan.
5) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, 2D-3D growth mode
transition in InGaAs/GaAs (001), 1994 Electronic Material Conference, U.S.A.
6) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, MBE growth kinetics
process of InGaAs on GaAs (001), 1994 MRS Fall Meeting, U.S.A.
7) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Optical studies of single
submonolayer and fractional layer InAs/GaAs superlattice structures grown in GaAs
matrix, 1995 MRS Spring Meeting, U.S. A.
8) Wei Li, Zhanguo Wang, Jiben Liang, Bo Xu, Zhanping Zhu, Photoluminescence studies
of fractional-layer InAs/GaAs superlattice structures grown in GaAs matrix, 1995 LDSD,
Singapore.
9) Wei Li, Peder Bergman, Bo Monemar, H. Amano, I. Akasaki, Time-resolve
photoluminescence studies of InGaN/GaN/AlGaN SQW, 1996 MRS Fall Meeting,
U.S.A.
10) Wei Li, Peder Bergman, I. Ivannov, Wei-Xin Ni, H. Amano, I. Akasaki, High resolution
X-ray diffraction and optical characterization of InGaN/GaN superlattices grown on
sapphire substrates with GaN layers, 1996 MRS Fall Meeting, U.S.A.
11) Wei Li, J. Turpeinen, P. Melanen, P. Savolainen, P. Uusimaa, M. Pessa: Growth of stain-
compensated GaInNAs/GaAsP Quantum Wells for 1.3 um Lasers. The fourth European
GaN Workshop, Nottingham, UK 2-5 July 2000.
12) Wei Li, Jani Turpeinen, Petri Melanen, Pekka Savolainen, Petteri Uusimaa, and Markus
Pessa, Strain-compensated GaInNAs/GaAsP QWs for 1.3 um lasers, 11th international
MBE conference, Beijing, China, September 11-15, 2000.
13) Wei Li, S. Laaksonen, J. Haapamaa, M. Pessa, Study of antiphase domain-free growth of
GaAs directly on offcut (001) Ge by gas-source molecular beam epitaxy, 11th
international MBE conference, Beijing, China, September 11-15, 2000.
14) Wei Li, Jani Turpeinen, V. Kuoppa, and Markus Pessa, Study of Nitrogen incorporation
in Ga(In)NAs materials grown by gas-source molecular beam epitaxy, 11th Euro MBE
workshop, Hinterzarten, Germany, February 4-7, 2001.
5. Wei Li
15) Wei Li and Markus Pessa, Growth of GaInNAs/GaAs by plasma-assisted molecular beam
epitaxy, European MRS conference, France, June5-8, 2001.
16) Wei Li, Jani Turpeinen, Petri Melanen, Pekka Savolainen, Petteri Uusimaa, and Markus
Pessa, Investigation of GaInNAs/GaAs QWs for 1.3 mm lasers, Polish-Finnish workshop
on Nitrides, Helsinki, Finland, 2000.
17) Wei Li, Markus Pessa, Jari. Likonen, Juha Toivonen and Harri Lipsanen, N incorporation
in GaInNAs materials grown by MBE, 10th International conference on Modulated
Semiconductor Structures, Linz, Austria, 23-27July, 2001.
18) Wei Li, Markus Pessa, Origin of improved luminescence efficiency after annealing of
Ga(In)NAs materials grown by molecular beam epitaxy, 43rd Electronic Material
Conference, Notre Dame, U.S.A., 27-29 June, 2001.
19) Wei Li, Markus Pessa, Origin of improved luminescence efficiency after annealing of
Ga(In)NAs materials grown by molecular beam epitaxy, European workshop on GaAs-
based lasers at 1300 nm, Lecce, Italy, 16-19 Sep. 2001.
20) Wei Li, T. Jouhti, P. Laukkanen, C. S. Peng, J. Konttinen, E. Pavelescu, M. Pessa, High
Performance 1.32 um GaInNAs/GaAs SQW Lasers Grown by Molecular Beam Epitaxy,
European Semiconductor Laser Workshop, Gent, Belgium, 28-29 Sep. 2001.
21) Wei Li, Markus Pessa, Origin of improved luminescence efficiency after annealing of
Ga(In)NAs materials grown by molecular beam epitaxy, 2002 Photonics West, San Jose
California.
22) Wei Li, Chang Si Peng, Tomi Jouhti, Janne Konttinen, Emil-Mihai Pavelescu, Mikko
Suominen, Mihail Dumitrescu, and Markus Pessa, High Performance 1.32 um
GaInNAs/GaAs SQW Lasers Grown by Molecular Beam Epitaxy, SPIE 4651, pp. 101-
106,2002 Photonics West, San Jose California.
23) W. M. Chen, N.Q. Thinh, I. A. Buyanova, P.N. Hai , H. P. Xin, C. W. Tu, Wei Li , M.
Pessa, Nature and Formation of Non-Radiative Defects in GaNAs And InGaAsN, 2001
MRS fall meeting.
24) Tomi Jouhti, Pekka Laukkanen, Chang Si Peng, Janne Konttinen, Wei Li and Markus
Pessa, Group III-arsenide-nitride quantum well structures on GaAs for laser diodes
emitting at 1.3μm, 2002 Photonics West, San Jose California.
25) Tomi Jouhti, Pekka Laukkanen, Chang Si Peng, Janne Konttinen, E. Pavelescu, Wei Li,
Markus Pessa, GaInNAs quantum well structures and lasers on GaAs grown by solid
source MBE, European workshop on GaAs-based lasers at 1300 nm, Lecce, Italy, 16-19
Sep. 2001.
26) Wei Li, Janne Konttinen, Chang Si Peng, Tomi Jouhti, Emil-Mihai Pavelescu, Mikko
Suominen, Mihail Dumitrescu, and Markus Pessa, High Performance 1.32 μm
GaInNAs/GaAs SQW Lasers Grown by Molecular Beam Epitaxy, 14th Indium
Phosphide and related Materials Conference, May 12-16, 2002, Stockholm, Sweden.
27) Wei Li, Tomi Jouhti, Chang Si Peng, Janne Konttinen, Emil-Mihai Pavelescu, Mikko
Suominen, Mihail Dumitrescu, and Markus Pessa, Invited presentation in 8th
International Conference on Electronic Materials (ICEM 2002).
28) S. Karirinne, Wei Li, J. Konttinen, J. Jouhti, M. Pessa, Growth of InAsN quantum dots on
GaAs by molecular beam epitaxy, 12th Euro-MBE Workshop, Feb. 16-19, 2003, Bad
Hofgastein, Austria.
29) M. Pessa, C.S. Peng, T. Jouhti, E.-M. Pavelescu, Wei Li, S. Karirinne, H.F. Liu, O. G.
Okhotnikov, Towards high-performance nitride lasers at 1.3 m and beyond, IEE Proc.
6. Wei Li
Optoelectronics 150 (1), pp. 12-21 (2003). International Workshop on Physics and
Technology of Dilute Nitrides for Optical Communications, Istanbul, Turkey, 8-12 Sept.,
2002.
30) E.-M. Pavelescu, T. Jouhti, M. Dumitrescu, C.S. Peng, Wei Li, J. Konttinen, V. Cimpoca,
M. Pessa, Photoluminescence study of strain-compensated GaInNAs/GaNAs/GaAs
quantum-well structures grown by molecular-beam epitaxy, CAS 2002, Int.
Semiconductor Conf., Sinaia, Romania, 8-12 Oct., 2002. Conf. proc., pp. 177-180 (2002).
31) C.S. Peng, Wei Li, T. Jouhti, E.-M. Pavelescu, M. Pessa, A study and control of lattice
sites of N and In/Ga interdiffusion in dilute nitride quantum wells, E-MRS 2002 Spring
Meeting, Strasbourg, France, June 18-21, 2002.
32) E.-M. Pavelescu, T. Jouhti, C.S. Peng, M. Dumitrescu, Wei Li, J. Konttinen, M. Pessa,
Influence of low-temperature growth on photoluminescence of 1.3-um
GaInNAs/GaNAs/GaAs quantum wells, International Workshop on the Physics and
Technology of Dilute Nitrides for Optical Communications, Istanbul, Turkey, 8-12 Sept.
2002.
33) C. S. Peng, T. Jouhti, J. Konttinen, Wei Li, M. Pessa, 1.3 m InGaAsN/GaAs Edge
Emitting and Vertical Cavity Surface Emitting Lasers grown by molecular beam epitaxy,
MBE XII Conf., San Fransisco, USA, September 15-20,2002. Conf. proc. pp. 63-64
(2002).
34) M. Dumitrescu, Wei Li, A. Rydefalk, R. Rönkkö, M. Peltola, M. Pessa, Extended
broadband superluminescent diodes, CLEO/IQEC, San Francisco, USA, May 16-21,
2004.
35) Wei Li, R. Rönkkö, M. Peltola, A. Rydefalk, M. Pessa, H.Schöll, S.Garidel.
K.A.Williams, P.Moreno, H.Lamela, M.Cavallari, Characterization of 1550 nm Fabry-
Perot Laser Structures for Application as Mode-Locked Pulse Sources, Photonics Europe
2004, Strasbourg, France, 26-30 April, 2004.
36) E.-M. Pavelescu, C.S. Peng, T. Jouhti, J. Konttinen, M. Dumitrescu, Wei Li, M. Pessa,
Enhanced optical and structural properties of strain-compensated 1.3-um GaInNAs/
GaNAs / GaAs quantum- well structures by insertion of strain-mediating layer, E-MRS
2002 Spring Meeting, Strasbourg, France, June 18-21, 2002.
37) M. Pessa, M. Dumitrescu, M. Guina, J. Haapamaa, P. Leinonen, Wei Li, P. Melanen, S.
Orsila, M. Saarinen, P. Savolainen, P. Sipilä, M. Toivonen, V. Vilokkinen, State-of-the-
art semiconductor light emitters and high-efficient solar cells prepared by the MBE
method, Northern Optics 2000, Uppsala, p. 32, Sweden, 6-8 June, 2000.
38) S. Laaksonen, J. Keränen, Wei Li, J. Haapamaa, P. Leinonen, M. Pessa, T. Lepistö, Gas-
Source Molecular Beam Epitaxy of GaAs on Ge for Solar Cell Applications, 16th
European Photovoltaic Solar Energy and Exhibiton, Glasgow, U.K., 1-5 May, 2000.
39) Wei Li, R. Rönkkö, M. Peltola, A. Rydefalk, M. Pessa, H. Schöll, S. Garidel.
K.A.Williams, P. Moreno, H. Lamela, M. Cavallari, Characterization of 1550 nm Fabry-
Perot Laser Structures for Application as Mode-Locked Pulse Sources, Photonics Europe,
Strasbourg, France, 26-30 April, 2004.
40) Wei Li, R. Rönkkö, A. Rydefalk, P. Pöyhönen, M. Pessa, High Performance 1550 nm
Superluminescent Diodes Based on Quantum Wells and Quantum Dots Structures,
Photonics West, 2005, USA.
7. Wei Li
Other Publications:
1) Wei Li, M. Pessa, Invited Chapter “Dilute Nitride Semiconductors for Optoelectronic
Devices” of the book “Handbook of Semiconductor Nanostructures and Devices,
published in 2005 by American Scientific Publishers.
2) Wei Li, M. Pessa, T. Jouhti, C.S. Peng, E.-M. Pavelescu, Invited Chapter "GaInNAs
quantum well laser" in Encyclopedia of Nanoscience and Nanotechnology, published in
January 2004 by American Scientific Publishers.
3) Wei Li, J. Konttinen, T. Jouhti, C.S. Peng, E.-M. Pavelescu, M. Suominen, M. Pessa,
Extending the emission wavelength of GaInNAs/GaAs quantum well lasers beyond 1300
nm in the book “Advanced Nanomaterials and Nanodevices” published by the Institute of
Physics Publishing. IOP Publishing Ltd, 2003. ISBN no. 0750309652, pp. 251-
260(2003).
4) Wei Li, J. Konttinen, T. Jouhti, C.S. Peng, E.-M. Pavelescu, M. Suominen, M. Pessa ,
Invited presentation in 8th International Conference on Electronic Materials
ICEM2002).
5) Wei Li, T. Jouhti, C.S. Peng, J. Konttinen, E.-M. Pavelescu, M. Suominen, M. Pessa,
Invited talk in "Narrow Bandgap Optoelectronic Materials and Devices Symposium",
202nd meeting of the Electrochemical Society in Salt Lake, USA.