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Mixed donor-acceptor molecular heterojunctions for photovoltaic applications. II. Device performance

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4 Author(s)
Xue, Jiangeng ; Department of Electrical Engineering and Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, New Jersey 08544 ; Rand, Barry P. ; Uchida, Soichi ; Forrest, S.R.

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We demonstrate efficient organic photovoltaic cells employing a photoactive region composed of a mixed donor-acceptor molecular layer, the properties of which were introduced in the preceding paper (Part I) [Rand etal, J. Appl. Phys. 98, 124902 (2005)]. The hybrid planar-mixed heterojunction (PM-HJ) device architecture consists of a film mixture of donor and acceptor molecules inserted between layers of pure donor and acceptor composition. Using the donor, copper phthalocyanine, and the acceptor, C60, we demonstrate a hybrid PM-HJ cell with a maximum power conversion efficiency of (5.0±0.3)% under 1–4 suns simulated AM1.5 solar illumination. The current-voltage characteristics of the PM-HJ cell are described using a model based on the field-dependent charge collection length.

Published in:

Journal of Applied Physics  (Volume:98 ,  Issue: 12 )

Date of Publication:

Dec 2005

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