Long-lived excited state of C60 in C60/phthalocyanine heterojunction solar cell

Kazuhiko Murata*, Shoji Ito, Kohshin Takahashi, Brian M Hoffman

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


The photovoltaic properties of ITO (indium tin oxide)/C60/H2(pc), (pc=phthalocyanine)/Au sandwich solar cells are investigated. The cell prepared at a higher vacuum (1×10-6 Torr) shows an open-circuit photovoltage (VOC) of 0.18 V, a short-circuit photocurrent (JSC) of 89 μAcm-2, a fill factor (ff) of 0.25, and an energy conversion yield (η) of 0.03% when illuminated by white light with 12.5 mW cm-2 intensity. The photocurrent action spectra of the cell reveal that photocurrent is generated at C60/H2(pc) interface with diffusion of C60 excitons because the excited state of C60 has a relatively long lifetime, while the cell prepared at a lower vacuum (3×10-5 Torr) shows a much smaller photocurrent (JSC=1.4 μAcm-2) because oxygen in C60 acts as carrier traps and increases the resistance of C60.

Original languageEnglish (US)
Pages (from-to)427-429
Number of pages3
JournalApplied Physics Letters
Issue number3
StatePublished - Dec 1 1996

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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