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 journalArticlepeer-review

21 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 languageEnglish
Pages (from-to)2036-2041
Number of pages6
JournalAdvanced Materials
Volume27
Issue number12
DOIs
Publication statusPublished - 2015 Mar 25
Externally publishedYes

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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