Journal
NANO LETTERS
Volume 12, Issue 3, Pages 1566-1570Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl204421p
Keywords
Organic materials; solar cells; X-ray diffraction; molecular packing
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Funding
- Department of Energy, Laboratory Directed Research and Development [DE-AC02-76SF00515]
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We compare the solar cell performance of several polymers with the conventional electron acceptor phenyl-C61-butyric acid methyl ester (PCBM) to fullerenes with one to three indene adducts. We find that the multiadduct fullerenes with lower electron affinity improve the efficiency of the solar cells only when they do not intercalate between the polymer side chains. When they intercalate between the side chains, the multiadduct fullerenes substantially reduce solar cell photocurrent. We use X-ray diffraction to determine how the fullerenes are arranged within crystals of poly-(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) and suggest that poor electron transport in the molecularly mixed domains may account for the reduced solar cell performance of blends with fullerene intercalation.
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