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Photoconductivity of C 60 as an Origin of Bias‐Dependent Photocurrent in Organic Photovoltaics
Author(s) -
Jeong WonIk,
Lee Yang Eun,
Shim HyunSub,
Kim TaeMin,
Kim SeiYong,
Kim JangJoo
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201200069
Subject(s) - photocurrent , photoconductivity , materials science , optoelectronics , organic solar cell , exciton , photovoltaics , ionization , fullerene , heterojunction , chemical physics , condensed matter physics , photovoltaic system , chemistry , physics , organic chemistry , ion , ecology , composite material , biology , polymer
The bulk‐ionized photoconductivity of C 60 is reported as an origin of the bias‐dependent linear change of the photocurrent in copper phthalocyanine (CuPc)/C 60 planar heterojunction solar cells, based on the observation of the variation of the bias‐dependent photocurrent on excitation wavelengths and the thickness‐dependent photocurrent of the C 60 layer. A theoretical model, which is a combination of the Braun‐Onsager model for the dissociation of excitons at the donor/acceptor interface and the Onsager model for the bulk ionization of excitons in the C 60 layer, describes the bias‐dependent photocurrent in the devices very well. The bulk‐ionized photoconductivity of C 60 must generally contribute to the photocurrent in organic photovoltaics, since fullerene and fullerene derivatives are widely used in these devices.