Analysis of Carbon Nanotubes and Quantum Dots in a Photovoltaic Device Francis Smith LSAMP Summer Program 2009 Electrical ...
Goal: Photovoltaic Device Design and fabricate: PHOTOVOLTAIC DEVICE which is a type of  SOLAR CELL using CARBON NANOTUBES ...
Single Walled Carbon Nanotubes (SWCNT) <ul><li>Single-layer graphene sheets rolled into cylinders </li></ul><ul><li>Of a h...
Cadmium Selenide Quantum Dots (CdSe QDs) <ul><li>Crystals (like salt), only nanometers in size </li></ul><ul><li>0-dimensi...
Methods I <ul><li>CdSe QD Preparation : </li></ul><ul><li>CDNTA + decylamine + Na 2 SeSO 3  + Toluene  </li></ul><ul><li>S...
Methods II YAG Laser Laser Attenuation Optics Scanning Platform Complete Z-Scan Setup Testing (Z-Scan) :
Results and Discussion I Absorption Spectrum of CdSe QDs (aq) Absorption Spectrum of SWCNTs (aq) SPECTROSCOPY : <ul><li>Ex...
Results and Discussion II Z-SCAN : Z-Scan of CS 2   (aq) at 8uJ and 1064nm (infrared) Z-Scan of CdSe QDs (aq) and13uJ at 5...
Future Work <ul><li>INDIVIDUALLY TEST  optical characteristics of CdSe QDs and SWCNTs in: </li></ul><ul><li>Solution (raw)...
References [1]: B.J. Landi et al, Solar Energy Materials & Solar Cells 87 (2005) 733–746 [2]: Kanwal, Alokik. A Review of ...
Upcoming SlideShare
Loading in …5
×

Analysis Of Carbon Nanotubes And Quantum Dots In A Photovoltaic Device Slide Presentation

2,042 views
1,813 views

Published on

Francis' presentation to Louis Stokes Association for Minority Participation. Since I co-authored this work I think I have the right to a copy. I was the graduate student Francis was working with.

Published in: Technology, Business
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
2,042
On SlideShare
0
From Embeds
0
Number of Embeds
22
Actions
Shares
0
Downloads
69
Comments
0
Likes
1
Embeds 0
No embeds

No notes for slide

Analysis Of Carbon Nanotubes And Quantum Dots In A Photovoltaic Device Slide Presentation

  1. 1. Analysis of Carbon Nanotubes and Quantum Dots in a Photovoltaic Device Francis Smith LSAMP Summer Program 2009 Electrical Engineering Department The City College of New York
  2. 2. Goal: Photovoltaic Device Design and fabricate: PHOTOVOLTAIC DEVICE which is a type of SOLAR CELL using CARBON NANOTUBES & QUANTUM DOTS
  3. 3. Single Walled Carbon Nanotubes (SWCNT) <ul><li>Single-layer graphene sheets rolled into cylinders </li></ul><ul><li>Of a hexagonal mesh-like structure </li></ul><ul><li>Of diameter between 0.33nm and 5nm </li></ul><ul><li>Of length between 2nm and 10nm </li></ul><ul><li>50 times as strong as steel </li></ul><ul><li>1-dimensional structures ( ballistic transport ) </li></ul>
  4. 4. Cadmium Selenide Quantum Dots (CdSe QDs) <ul><li>Crystals (like salt), only nanometers in size </li></ul><ul><li>0-dimensional structures ( quantum confinement ) </li></ul><ul><li>Of 2nm to 10nm (10-50 atoms) in diameter </li></ul><ul><li>Large surface area to volume ratio: efficient light absorber </li></ul>
  5. 5. Methods I <ul><li>CdSe QD Preparation : </li></ul><ul><li>CDNTA + decylamine + Na 2 SeSO 3 + Toluene </li></ul><ul><li>SWCNTA Preparation : </li></ul><ul><li>470 o C oven + HCL + sonicate in DI H 2 O + centrifuge </li></ul><ul><li>Film Making : </li></ul><ul><li>Drop solution at 100rpm + 1000rpm (20sec) + 200rpm (20min) + 2000rpm (5sec) </li></ul>(aq) (aq)
  6. 6. Methods II YAG Laser Laser Attenuation Optics Scanning Platform Complete Z-Scan Setup Testing (Z-Scan) :
  7. 7. Results and Discussion I Absorption Spectrum of CdSe QDs (aq) Absorption Spectrum of SWCNTs (aq) SPECTROSCOPY : <ul><li>Exciton peaks were expected and observed at approximately 415nm , 350nm and 380nm </li></ul><ul><li>Therefore efficient absorption occurs at these wavelengths </li></ul><ul><li>An absorption peak was expected and observed at approximately 440nm </li></ul><ul><li>Therefore, efficient absorption occurs at this wavelength </li></ul>
  8. 8. Results and Discussion II Z-SCAN : Z-Scan of CS 2 (aq) at 8uJ and 1064nm (infrared) Z-Scan of CdSe QDs (aq) and13uJ at 532nm (green) <ul><li>The symmetricity and smoothness of this reference curve indicate good alignment and a stable beam </li></ul><ul><li>Therefore, samples can now be scanned </li></ul><ul><li>CdSe QD two photon absorption (TPA) curve </li></ul><ul><li>This confirms the optical limiting property of QDs </li></ul>MAXIMUM INTENSITY
  9. 9. Future Work <ul><li>INDIVIDUALLY TEST optical characteristics of CdSe QDs and SWCNTs in: </li></ul><ul><li>Solution (raw) </li></ul><ul><li>Solution + PS (polystyrene) </li></ul><ul><li>Film 1 (from raw solution) </li></ul><ul><li>Film 2 (from solution + PS) </li></ul>1 2 3 COMBINE QDs and SWCNTs and test all 4 combinations as in step 1 <ul><li>FABRICATE Photovoltaic Cell with ITO electrodes </li></ul><ul><li>CHARACTERIZE cell for energy conversion efficiency </li></ul>
  10. 10. References [1]: B.J. Landi et al, Solar Energy Materials & Solar Cells 87 (2005) 733–746 [2]: Kanwal, Alokik. A Review of Carbon Nanotube Field Effect Transistors (Version 2.0).(2003). [3]: “Quantum Dots Explained.” Evident Technologies. 2008. http://www.evidenttech.com/quantum-dots-explained.html. 06 July 2009. [4]: Avila et al, Molecular Mechanics Applied to Single-Walled Carbon Nanotubes. Mat. Res. [online]. 2008, vol.11, n.3 [cited 2009-07-15], pp. 325-333 [5]: Pileni, Marie-Paule, Nature Materials 2, 145–150 (2003) [6]: Chaiwat Engtrakul, et al, Self-Assembly of Linear Arrays of Semiconductor Nanoparticles on Carbon Single-Walled Nanotubes,J. Phys. Chem. B, 2006, 110 (50), 25153-25157 [7]: A. Kasuya et al.: Stoichiometric and ultra-stable nanoparticles of II-VI compound semiconductors, Eur. Phys. J. D 34, 39–41 (2005)

×