Journal
ADVANCED ENERGY MATERIALS
Volume 1, Issue 5, Pages 963-969Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201100300
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Funding
- Florida Energy Systems Consortium
- Department of Energy Basic Energy Sciences [DE-FG0207ER46464]
- AFOSR [FA9550-09-1-0320]
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Photo-current loss in donor-acceptor (DA) polymer-fullerene bulk heterojunction solar cells was studied via carrier transport and recombination measurements. Focusing on the DA polymer poly((4,4-dioctyldithieno (3,2-b:2',3'-d) silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl) (DTS-BTD) we found that the carrier transport is well-balanced and attribute the loss mechanism in DTS-BTD solar cells to carrier recombination. Using carrier extraction with linear increasing voltage (photo-CELIV) and transient photo-voltage (TPV), we show that carrier recombination plays an important role in photo-current extraction at open circuit conditions due to increase in photo-excited carrier concentration. Delay time dependent photo-CELIV and temperature dependent transport studies suggest that the recombination rate is related to the degree of energetic disorder in the polymer: fullerene blends.
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