Ultrafast Charge Transfer in Operating Bulk Heterojunction Solar Cells

被引：33

作者：

Zhong, Chengmei ^{[1
,2
]}

Choi, Hyosung ^{[1
,3
,4
]}

Kim, Jin Young ^{[1
,3
,4
]}

Woo, Han Young ^{[5
]}

Thanh Luan Nguyen ^{[5
]}

Huang, Fei ^{[2
]}

Cao, Yong ^{[2
]}

Heeger, Alan J. ^{[1
,6
,7
]}

机构：

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

[2] S China Univ Technol, Inst Polymer Optoelect Mat & Devices, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China

[3] UNIST, Interdisciplinary Sch Green Energy, Ulsan 689798, South Korea

[4] UNIST, KIER UNIST Adv Ctr Energy, Ulsan 689798, South Korea

[5] Pusan Natl Univ, Dept Nanofus Engn, Dept Cognomechatron Engn WCU, Miryang 627706, South Korea

[6] Univ Calif Santa Barbara, Dept Chem, Santa Barbara, CA 93106 USA

[7] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

来源：

ADVANCED MATERIALS | 2015年 / 27卷 / 12期

关键词：

bulk heterojunctions; organic solar cells; transient reflection spectroscopy; ultrafast charge transfer; OPEN-CIRCUIT VOLTAGE; ORGANIC PHOTOVOLTAICS; POLYMER; GENERATION; SEPARATION; EFFICIENCY; COHERENCE; GEMINATE; LOSSES; BLENDS;

D O I：

10.1002/adma.201405284

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The ultrafast charge generation process in organic solar cell devices is investigated by transient reflection spectroscopy on five state-of-the-art bulk heterojunction systems. The charge generation process in operating devices is found to be a combination of an ultrafast generation mechanism over several hundred femtoseconds and a slow process from picoseconds to nanoseconds, limited by exciton diffusion dynamics. In addition, the lack of electric field dependence in the charge dynamics rules out geminate recombination as an important loss mechanism.

引用

页码：2036 / 2041

页数：6

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