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

Thank you. Questions?

You may reach us at nanosol@mit.eduhttp://web.mit.edu/course/3/3.042/team1_10