Photo-generated carrier dynamics in the vicinity of the donor/acceptor interface of organic solar cells

Soh Ryuzaki, Jun Onoe

Research output: Contribution to journalArticle

Abstract

Change in electronic states before and after photo-irradiation at a Donor/Acceptor (D/A) interface in organic solar cells consisting of zinc-porphyrin and fullerene films has been examined using in situ impedance spectroscopy (IS), which makes it possible to non-destructively measure a built-in potential (Vbi) of both D and A films at the D/A interface. The accumulation of photo-generated carriers in the vicinity of the D/A interface was found to increase the Vbi of both D [Zn(OEP)] and A [C60] films at the interface. In addition, it was noted that the sum of Vbi obtained on photo-irradiation was in good agreement with the open-circuit voltage (VOC), of which the origin is still unsolved for organic solar cells. Thus, the charge accumulation of photo-generated carriers in the vicinity of the D/A interface plays a key role in determining V OC.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalElectronics and Communications in Japan
Volume96
Issue number8
DOIs
Publication statusPublished - Aug 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Computer Networks and Communications
  • Physics and Astronomy(all)
  • Signal Processing
  • Applied Mathematics

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