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Ultrafast charge transfer in operating bulk heterojunction solar cells.

Authors
  • Zhong, Chengmei
  • Choi, Hyosung
  • Kim, Jin Young
  • Woo, Han Young
  • Nguyen, Thanh Luan
  • Huang, Fei
  • Cao, Yong
  • Heeger, Alan J
Type
Published Article
Journal
Advanced Materials
Publisher
Wiley (John Wiley & Sons)
Publication Date
Mar 25, 2015
Volume
27
Issue
12
Pages
2036–2041
Identifiers
DOI: 10.1002/adma.201405284
PMID: 25677734
Source
Medline
Keywords
License
Unknown

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 femto-seconds and a slow process from pico-seconds 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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