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Photoconductivity of C60 as an Origin of Bias-Dependent Photocurrent in Organic Photovoltaics
Article first published online: 17 APR 2012
DOI: 10.1002/adfm.201200069
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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How to Cite
Jeong, W.-I., Lee, Y. E., Shim, H.-S., Kim, T.-M., Kim, S.-Y. and Kim, J.-J. (2012), Photoconductivity of C60 as an Origin of Bias-Dependent Photocurrent in Organic Photovoltaics. Adv. Funct. Mater., 22: 3089–3094. doi: 10.1002/adfm.201200069
Publication History
- Issue published online: 11 JUL 2012
- Article first published online: 17 APR 2012
- Manuscript Revised: 24 FEB 2012
- Manuscript Received: 10 JAN 2012
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Keywords:
- bias-dependent photocurrent;
- charge collection efficiency;
- photoconductivity;
- planar heterojunction solar cells;
- organic solar cells
Abstract
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.