Ultrafast charge transfer in operating bulk heterojunction solar cells

Chengmei Zhong; Hyosung Choi; Jin Young Kim; Han Young Woo; Thanh Luan Nguyen; Fei Huang; Yong Cao; Alan J. Heeger

doi:10.1002/adma.201405284

Ultrafast charge transfer in operating bulk heterojunction solar cells

Chengmei Zhong, Hyosung Choi, Jin Young Kim, Han Young Woo, Thanh Luan Nguyen, Fei Huang, Yong Cao, Alan J. Heeger

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	2036-2041
Number of pages	6
Journal	Advanced Materials
Volume	27
Issue number	12
DOIs	https://doi.org/10.1002/adma.201405284
Publication status	Published - 2015 Mar 25
Externally published	Yes

Keywords

bulk heterojunctions
organic solar cells
transient reflection spectroscopy
ultrafast charge transfer

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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title = "Ultrafast charge transfer in operating bulk heterojunction solar cells",

abstract = "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.",

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T1 - Ultrafast charge transfer in operating bulk heterojunction solar cells

AU - Zhong, Chengmei

AU - Choi, Hyosung

AU - Kim, Jin Young

AU - Woo, Han Young

AU - Nguyen, Thanh Luan

AU - Huang, Fei

AU - Cao, Yong

AU - Heeger, Alan J.

PY - 2015/3/25

Y1 - 2015/3/25

N2 - 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.

AB - 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.

KW - bulk heterojunctions

KW - organic solar cells

KW - transient reflection spectroscopy

KW - ultrafast charge transfer

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