Molecular Packing and Solar Cell Performance in Blends of Polymers with a Bisadduct Fullerene

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• 作者：Nichole Cates Miller ; Sean Sweetnam ; Eric T. Hoke ; Roman Gysel ; Chad E. Miller ; Jonathan A. Bartelt ; Xinxin Xie ; Michael F. Toney ; Michael D. McGehee
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：March 14, 2012
• 年：2012
• 卷：12
• 期：3
• 页码：1566-1570
• 全文大小：271K
• 年卷期：v.12,no.3(March 14, 2012)
• ISSN：1530-6992

文摘

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.

Keywords:

Organic materials; solar cells; X-ray diffraction; molecular packing