Title: Dark carrier recombination in organic solar cell
Authors: Wang, Ying-Xuan
Tseng, Shin-Rong
Meng, Hsin-Fei
Lee, Kuan-Chen
Liu, Chiou-Hua
Horng, Sheng-Fu
Institute of Physics
Department of Electronics Engineering and Institute of Electronics
Issue Date: 29-Sep-2008
Abstract: The carrier recombination in organic solar cells is investigated by numerical modeling to understand the weak dependence of theopen-circuit voltage on the workfunction of the electrodes. In Ohmic contact structures, photocarriers recombine predominantly with dark carriers diffused from the electrode into the semiconductor. Such dark carrier recombination becomes the main limit of power conversion efficiency and open-circuit voltage. For a given semiconductor decreasing the workfunction difference of the electrodes reduces simultaneously the dark carrier recombination and the flat band voltage. The balance between these two opposite factors gives a nearly constant open-circuit voltage. In an ideal bilayer structure there is no dark carrier recombination and the efficiency is demonstrated to be 60% higher than single layer blend. (C) 2008 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.2972115
ISSN: 0003-6951
DOI: 10.1063/1.2972115
Volume: 93
Issue: 13
End Page: 
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