Photoinduced carrier generation in P3HT/PCBM bulk heterojunction materials

被引：320

作者：

Hwang, In-Wook ^{[1
]}

Moses, Daniel ^{[1
]}

Heeger, Alan J. ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 11期

关键词：

D O I：

10.1021/jp075565x

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Using ultrafast spectroscopy, we have investigated the generation of mobile carriers in bulk heterojunction (BHJ) blends of regioregular poly(3-hexylthiophene), rrP3HT and the [6,6]-phenyl-C-61 butyric acid methyl ester fullerene derivative, PCBM. Mobile carriers are generated via a two-step process: initial ultrafast charge separation to an intermediate charge transfer (CT) bound state, followed by the transfer of carriers onto the bicontinuous networks. The yield of mobile carriers is decreased by recombination during the time spent in the CT bound state. After annealing the BHJ blends, the recombination loss of mobile carriers is reduced by a factor of 2.5, consistent with the observed increase in photovoltaic conversion efficiency.

引用

页码：4350 / 4354

页数：5

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