Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 22, Issue 14, Pages 3089-3094Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201200069
Keywords
bias-dependent photocurrent; charge collection efficiency; photoconductivity; planar heterojunction solar cells; organic solar cells
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Funding
- Ministry of Knowledge Economy [20093020010040]
- Korea Research Foundation NCRC [R15-2008-006-01001-1]
- WCU (World Class University) through the National Research Foundation of Korea
- Ministry of Education, Science and Technology [R31-2008-000-10075-0]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20093020010040] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [R31-2012-000-10075-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The bulk-ionized photoconductivity of C60 is reported as an origin of the bias-dependent linear change of the photocurrent in copper phthalocyanine (CuPc)/C60 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 C60 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 C60 layer, describes the bias-dependent photocurrent in the devices very well. The bulk-ionized photoconductivity of C60 must generally contribute to the photocurrent in organic photovoltaics, since fullerene and fullerene derivatives are widely used in these devices.
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