Photocurrent generation through electron-exciton interaction at the organic semiconductor donor/acceptor interface

Lijia Chen, Qiaoming Zhang, Yanlian Lei, Fu Rong ZHU, Bo Wu, Ting Zhang, Guoxi Niu, Zuhong Xiong, Qunliang Song*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In this work, we report our effort to understand the photocurrent generation that is contributed via electron-exciton interaction at the donor/acceptor interface in organic solar cells (OSCs). Donor/acceptor bi-layer heterojunction OSCs, of the indium tin oxide/copper phthalocyanine (CuPc)/fullerene (C60)/molybdenum oxide/Al type, were employed to study the mechanism of photocurrent generation due to the electron-exciton interaction, where CuPc and C60 are the donor and the acceptor, respectively. It is shown that the electron-exciton interaction and the exciton dissociation processes co-exist at the CuPc/C60 interface in OSCs. Compared to conventional donor/acceptor bi-layer OSCs, the cells with the above configuration enable holes to be extracted at the C60 side while electrons can be collected at the CuPc side, resulting in a photocurrent in the reverse direction. The photocurrent thus observed is contributed to primarily by the charge carriers that are generated by the electron-exciton interaction at the CuPc/C60 interface, while charges derived from the exciton dissociation process also exist at the same interface. The mechanism of photocurrent generation due to electron-exciton interaction in the OSCs is further investigated, and it is manifested by the transient photovoltage characteristics and the external quantum efficiency measurements.

Original languageEnglish
Pages (from-to)16891-16897
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number39
DOIs
Publication statusPublished - 18 Sep 2013

Scopus Subject Areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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