1. Update 2 April 2, 2010 JESUS GUARDADO, LEAH NATION, HUY NGUYEN, TINA RO

2. Agenda Project Background Fabrication Testing Project Changes Schedule Flexible Cell http://www.worldofrenewables.com

3. Project Background Polymeric Photovoltaic Cells o Low fabrication costs o Fast processing speed o Light weight o Flexible Carbon Nanotubes o Aid transfer of electrons o Prevents charge recombination o Improves Voc, Jsc o $8 per m2 SWeNT SG 65, from CoMoCAT

4. Fabrication & Testing Update Assembled 10 samples: Prepared solutions Spin-coated onto substrates Deposited electrode Testing Efficiency calculation via I-V curve Optical absorption range via UV-vis spectroscopy

5. Testing UV-Vis o verified CNT presence o gauged absolute effect of CNTs in CNT/P3HT mix I-V Curve o resistors, not diodes Uv-vis w/ NIR in ISN lab

6. Results: UV-Vis

7. Results: I-V Curves Sample Result Desired Diode Curve

8. Analysis Samples weren't diodes  P3HT:CNT layer too thin  TiO2 too conductive  pattern transparent  scotch tape Chloroform  evaporates too quickly  nonuniform coats Cell Pattern ONE Lab

9. Modifications FTO instead of ITO  substrate availability 4 devices per glass slide  more devices to test  precise tape placement separate CNT from P3HT  spin coat separately P3HT solvent -> dichlorobenzene:  Higher boiling point  40mg/mL, before 10mg/mL www.mse.edu

10. Layer Separation

15. New Cell Design Original CellNew Cell FTO - Fluoride Tin Oxide PEDOT - Poly(3,4-ethylenedioxythiophene) P3HT - poly(3-hexylthiophene)

16. Current Progress & Future Schedule

17. Thank you. Questions? You may reach us at nanosol@mit.edu http://web.mit.edu/course/3/3.042/team1_10