Increased open-circuit voltage in bulk-heterojunction solar cells using a C60 derivative

The fullerene derivative C60-fused N-methyl-2-(3-hexylthiophen-2-yl)pyrrolidine (C60-TH-Hx) is used as the acceptor material in bulk-heterojunction (BHJ) solar cells fabricated with the low band-gap polymer poly[(4,4′-bis(2-ethylhexyl)dithiene[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2...

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Bibliographic Details
Published in:Applied physics letters 2010-11, Vol.97 (19)
Main Authors: Kim, Heejoo, Seo, Jung Hwa, Park, Eun Young, Kim, Tae-Dong, Lee, Kwanghee, Lee, Kwang-Sup, Cho, Shinuk, Heeger, Alan J.
Format: Article
Language:English
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Summary:The fullerene derivative C60-fused N-methyl-2-(3-hexylthiophen-2-yl)pyrrolidine (C60-TH-Hx) is used as the acceptor material in bulk-heterojunction (BHJ) solar cells fabricated with the low band-gap polymer poly[(4,4′-bis(2-ethylhexyl)dithiene[3,2-b:2′,3′-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,5′-diyl]. Direct comparison with BHJ solar cells based on [6,6]-phenyl-C61-butyric methyl ester and Si-PCPDTBT indicates that the C60-TH-Hx acceptor yields a larger open-circuit voltage because of higher lowest unoccupied molecular orbital energy level of C60-TH-Hx.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3518066