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Update 2April 2, 2010
JESUS GUARDADO, LEAH NATION, HUY NGUYEN, TINA RO
Agenda
• Project Background • Fabrication
• Testing
• Project Changes
• Schedule
Flexible Cell
http://www.worldofrenewables.com
Project Background
Polymeric Photovoltaic Cells
o Low fabrication costso Fast processing speed o Light weighto Flexible
Carbon Nanotubes
o Aid transfer of electronso Prevents charge recombinationo Improves Voc, Jsco $8 per m2
SWeNT SG 65, from CoMoCAT
SWeNT SG 65, from CoMoCAT
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
Testing
• UV-Viso verified CNT presenceo gauged absolute effect of CNTs in CNT/P3HT mix
• I-V Curve
o resistors, not diodes
Uv-vis w/ NIR in ISN lab
Results: UV-Vis
Results: I-V Curves
Sample Result Desired Diode Curve
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
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
Layer Separation
Layer Separation
Layer Separation
Layer Separation
Layer Separation
New Cell Design
Original Cell New Cell
FTO - Fluoride Tin OxidePEDOT - Poly(3,4-ethylenedioxythiophene)P3HT - poly(3-hexylthiophene)
Current Progress & Future Schedule