Influence of charge accumulation of photogenerated carriers in the vicinity of donor/acceptor interface on the open-circuit voltage of zinc-porphyrin/ C60 heterojunction organic photovoltaic cells

Sou Ryuzaki, Jun Onoe

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14 Citations (Scopus)

Abstract

The correlation between open-circuit voltage (VOC) and built-in potential (Vbi) upon photo-irradiation in the vicinity of the donor/acceptor (D/A) interface in zinc-octaethylporphyrin [Zn(OEP)]/C 60 heterojunction photovoltaic (OPV) cells is investigated by examining the capacitance-voltage (C-V) characteristics. Charge accumulation of photogenerated carriers in the vicinity of the D/A interface is found to enlarge Vbi of both D [Zn(OEP)] and A (C60) films in the vicinity of the interface. In addition, it is noted that VOC is in good agreement with the sum of Vbi of each film in the vicinity of the D/A interface. This suggests that charge accumulation of photogenerated carriers in the vicinity of the D/A interface plays a key role in determining V OC for solar cells.

Original languageEnglish
Article number265102
JournalJournal of Physics D: Applied Physics
Volume44
Issue number26
DOIs
Publication statusPublished - Jul 6 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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