Organic thermoelectric generators
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Organic thermoelectric generators are a promising alternative to traditional inorganic thermoelectric materials. They offer advantages such as abundance, low weight, flexibility, low-cost solution processing and the potential for high thermoelectric figures of merit. Research has achieved a maximum figure of merit (ZT) of 0.42 for p-type and 0.2 for n-type organic materials. However, major challenges remain in reducing the large contact resistance between organic thermoelectric materials and device electrodes, which hinders power output. Further optimization of materials processing and device design is needed to realize the commercial potential of organic thermoelectric generators.
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2) The document details the electrochemical synthesis of Bi2Te3 from bismuth chloride and a tellurium glycolate precursor in an ionic liquid electrolyte.
3) Constant potential electrodeposition at different potentials produced Bi2Te3 coatings with nanoparticle or nanostructured morphologies and varying Bi:Te atomic ratios, demonstrating the ability to control composition through the electrochemical method.
Combining density functional theory calculations, supercomputing, and data-dr...
Combining density functional theory calculations, supercomputing, and data-driven methods to design new thermoelectric materials
Anubhav Jain presents on using computational methods like density functional theory calculations combined with large datasets and machine learning to design new thermoelectric materials. He discusses how DFT can be used for high-throughput screening of many materials to discover promising candidates. He highlights the Materials Project database which has calculated properties of over 65,000 materials and is used by many researchers. An example is given of screening over 50,000 compounds to find new thermoelectric materials like TmAgTe2 which was later experimentally verified. The goal is to accelerate materials discovery through these computational approaches.
Mrs 2008 Fall Walker
The document discusses the application of titanium oxide as an electron injection layer in organic optoelectronic devices through solution-based processes like sol-gel. It describes how amorphous and nano-crystalline titanium oxide synthesized by sol-gel and deposited via spin-coating can improve device performance when used as the electron injection layer in polymer LEDs and organic solar cells. Experimental results show that devices using the titanium oxide layer have higher efficiencies compared to those using other solution-processed layers like cesium carbonate. The document concludes that solution-processed titanium oxide is a promising material that can be employed as an electron injection layer for applications in printed electronics.
Synthesis and Dielectric Characterization of Barium Substituted Strontium Bis...
The strontium bismuth niobate, SrBi2Nb2O9 (SBN) is a bismuth layered perovskite oxide
compound with potentially useful ferroelectric properties which offer several advantages such as fatigue
free, lead free, low operating voltages, relatively high Curie temperature; and most importantly, their
ferroelectric properties are independent of film thickness. These materials are also important for Fe-RAM
applications having large remanent polarization and low coercivity accompanied by high Curie
temperature for better performance and reliable operation. Present paper describes synthesis, dielectric
properties and impedance studies to reveal the important properties of barium substituted strontium
bismuth niobate, Sr0.85Ba0.15Bi2Nb2O9 in the system Sr1-xBaxBi2Nb2O9(x=0.15).
SYNTHESIS AND DIELECTRIC CHARACTERIZATION OF BARIUM SUBSTITUTED STRONTIUM BIS...
The strontium bismuth niobate, SrBi2Nb2O9 (SBN) is a bismuth layered perovskite oxide
compound with potentially useful ferroelectric properties which offer several advantages such as fatigue
free, lead free, low operating voltages, relatively high Curie temperature; and most importantly, their
ferroelectric properties are independent of film thickness. These materials are also important for Fe-RAM
applications having large remanent polarization and low coercivity accompanied by high Curie
temperature for better performance and reliable operation. Present paper describes synthesis, dielectric
properties and impedance studies to reveal the important properties of barium substituted strontium
bismuth niobate, Sr0.85Ba0.15Bi2Nb2O9 in the system Sr1-xBaxBi2Nb2O9(x=0.15).
Kinetic Analysis of TL Spectrum of ϒ-IrradiatedSrAl2O4:Eu2+, Dy3+ Nanophosphor
Thermoluminescence is a simple technique for studying
the distribution of artificially created or naturally occurring
point defects. In present work we are reanalyzing the
Thermoluminescence response of Eu2+,Dy3+ doped SrAl2O4
nanophosphor at different irradiation dose of ϒ-rays, in
accordance with new method of analysis. Orders of kinetics for
different glow curves are recalculated. Order of kinetics values
are not same as already reported in literature. As per new model
order of kinetics depends on extent of retrapping and from
reanalysis we can infer that all the reported TL responses of
material under consideration are retrapping dominant process.
Methods, tools, and examples (Part II): High-throughput computation and machi...
The document discusses using high-throughput density functional theory (DFT) calculations and machine learning to aid in the design of thermoelectric materials. It describes how the author's group has used automated DFT workflows to screen over 50,000 compounds for potential thermoelectric performance. Several new materials with promising figures of merit were identified through this process, including TmAgTe2, though experimental realization proved challenging. It also discusses efforts to incorporate machine learning to help guide materials discovery and address limitations of DFT, such as accurately modeling doping concentrations. Overall, the document outlines the author's work applying computational methods at a large scale to accelerate the discovery of efficient thermoelectric materials.
International Refereed Journal of Engineering and Science (IRJES)
a leading international journal for publication of new ideas, the state of the art research results and fundamental advances in all aspects of Engineering and Science. IRJES is a open access, peer reviewed international journal with a primary objective to provide the academic community and industry for the submission of half of original research and applications.
Dielectric, Electric and Thermal Behavior of La3+ doped Co-Zn Nanoferrite
Dielectric, Electric and Thermal properties of rare earth La3+ material doped in Co0.5Zn0.5 Lax Fe(2- x)O4 (where x=0.025, 0.050, 0.075, 0.100, 0.125) reaction nanocrystalline ferrites were synthesized by sol-gel auto combustion method. The electric, dielectric constant and Thermal properties were investigated. The dielectric constants and dielectric loss of the samples was observed between the 100Hz and 5 MHz. The resistivities of the prepared samples were measured from 0 Volt to 550 Volts at the constant temperature 2000C using the Two Probe method. The Thermal properties were characterized by Thermo Gravimetric and Differential Thermal Analysis (TGDTA).
Review on Thermoelectric materials and applications
In this paper thermoelectric materials are theoretically analyzed. The thermoelectric cooler device proposed here uses semiconductor material and uses current to transport energy (i.e., heat) from a cold source to a hot source via n- and p-type carriers. This device is fabricated by combining the standard n- and p-channel solid-state thermoelectric cooler with a two-element device inserted into each of the two channels to eliminate the solid-state thermal conductivity. The heat removed from the cold source is the energy difference, because of field emitted electrons from the n-type and p-type semiconductors. The cooling efficiency is operationally defined as where V is the anode bias voltage The cooling device here is shown to have an energy transport (i.e., heat) per electron of about500 me V depending on concentration and field while, in good thermoelectric coolers, it is about 50-60 me V at room temperature.
ppt1.pptx
This research proposal aims to investigate titanium-based Heusler alloys for thermoelectric applications using computational modeling and experimental synthesis. The researcher will use density functional theory calculations to model pristine and doped titanium alloys and estimate their thermoelectric properties like Seebeck coefficient and power factor. Experimentally, the researcher will synthesize and grow single crystals of titanium alloys with and without dopants. The best performing crystals will be fabricated into thermoelectric devices to harness waste heat and potentially commercialize the technology.
Piezoelectric Thermo-Acoustic Refrigeration System with Peltier Module Energy...
The document describes the design and analysis of a piezoelectric thermo-acoustic refrigeration system with Peltier module energy regeneration. The system uses acoustic waves generated by a piezoelectric speaker to transport heat across a temperature gradient in an aluminum stack. A Peltier module is used to convert waste heat to electricity. The components, design considerations, DeltaEC model, and theoretical analysis results showing temperature drop are discussed. The system aims to provide efficient refrigeration using thermoacoustic principles without moving parts or hazardous refrigerants.
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Organic thermoelectric generators
- 2. Current Scenario US Data ~ 2013 2
- 4. THERMOELECTRICITY Seebeck Effect Peltier Effect Thomson Effect 4
- 5. J.-C. Zheng, Front. Phys. China, 2008, 3(3): 269-2795
- 6. INTERRELATION LTe Wiedemann-Franz Law TZT α 2 Figure of merit n TK EE e K B FCB Seebeck coefficient Thermoelectric Efficiency 6
- 7. The Sweet Spot Semiconductors MetalsSemimetals & highly doped semiconductors J.-C. Zheng, Front. Phys. China, 2008, 3(3): 269-2797
- 8. Thermoelectric Materials The good thermoelectric materials should possess 8
- 9. Why ORGANIC Potentially abundant Light-weight Flexible Solution- processable Low-cost HIGHEST ZT VALUES ACHIEVED p-type= 0.42 (G. H. Kim , L. Shao , K. Zhang , K. P. Pipe , Nat. Mater. 2013 , 12 ,719) n-type= 0.2(Y. M. Sun , P. Sheng , C. A. Di , F. Jiao , W. Xu , D. Qiu , D. B. Zhu , Adv. Mater. 2012 , 24 , 932) 9
- 10. n-type ---- poly[Nax(Ni-ett)] n-type ---- poly[Kx(Ni-ett)] p-type ---- poly[Cux(Cu-ett)] Synthesis Scheme 10
- 12. Thermoelectric module with 35 legs based on poly[Nax(Ni-ett)] and poly[Cux(Cu-ett)] on AlN substrate Cuboid: 5 mm × 2 mm × 0.9 mm Thot =423 K ΔT = 82 K V = 0.26 V ISC =10.1 mA RL = 33Ω Pout = 750 μW NO LIFETIME CHARACTERIZATION HAS BEEN DONE ON ORGANIC TE DEVICES BEFORE 12
- 13. Average particle size n-type composite ~ 456–850nm p-type composite~ 229–414 nm Jiao F, Di C-a, Sun Y, Sheng P, XuW, Zhu D, Phil. Trans. R. Soc. A 372: 20130008 Poly(Metal-ett)/ PVDF 13
- 14. Drying temperature affects the TE properties 14
- 15. MAJOR DRAWBACK Contact resistance between the TE material and device electrodes (51Ω) is quite large compared with the resistance of the thermocouple (3.1Ω), thus hindering the power output. Thot =50 °C ΔT = 25 °C V = 15mV ISC = 3μA RL= 5000Ω Pout = 45nW insulating PVDF significantly blocks the pathway for transporting carriers 15
- 16. Date: April 10, 2014 Source: The Korea Advanced Institute of Science and Technology (KAIST) 16
- 17. 17
Editor's Notes
- 1,3,4,6-tetrathiapentalene-2,5-dione (TPD)
- Poly(Metal-ett)/ PVDF + DMSO PET= polyethylene terephthalate
- The main problem that affects the PF is the reduction in electrical conductivity, as the insulating PVDF significantly blocks the pathway for transporting carriers