Incomplete Exciton Harvesting from Fullerenes in Bulk Heterojunction Solar Cells

被引：128

作者：

Burkhard, George F. ^{[2
]}

Hoke, Eric T. ^{[2
]}

Scully, Shawn R. ^{[1
]}

McGehee, Michael D. ^{[1
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA

[2] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA

来源：

NANO LETTERS | 2009年 / 9卷 / 12期

基金：

美国国家科学基金会;

关键词：

POLYMER; MORPHOLOGY; POLYTHIOPHENE; ORGANIZATION; FILMS;

D O I：

10.1021/nl902205n

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We investigate the internal quantum efficiencies (IQEs) of high efficiency poly-3-hexylthiophene:[6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM) solar cells and find them to be lower at wavelengths where the PCBM absorbs. Because the exciton diffusion length in PCBM is too small, excitons generated in PCBM decay before reaching the donor-acceptor interface. This result has implications for most state of the art organic solar cells, since all of the most efficient devices use fullerenes as electron acceptors.

引用

页码：4037 / 4041

页数：5

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