Journal
JOURNAL OF APPLIED PHYSICS
Volume 98, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2142073
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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 , 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, C-60, 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. (c) 2005 American Institute of Physics.
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