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

被引:132
作者
Miller, Nichole Cates [1 ]
Sweetnam, Sean [1 ]
Hoke, Eric T. [1 ,3 ]
Gysel, Roman [1 ]
Miller, Chad E. [1 ,2 ]
Bartelt, Jonathan A. [1 ]
Xie, Xinxin [1 ]
Toney, Michael F. [2 ]
McGehee, Michael D. [1 ]
机构
[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
[2] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA
[3] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
关键词
Organic materials; solar cells; X-ray diffraction; molecular packing; BIMOLECULAR CRYSTALS; ADDUCT FULLERENE; ACCEPTOR; HETEROJUNCTIONS; INTERCALATION; EFFICIENCIES; GENERATION; TRANSPORT; ENERGY;
D O I
10.1021/nl204421p
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:1566 / 1570
页数:5
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