Dipole induced anomalous S-shape I-V curves in polymer solar cells

被引:193
作者
Kumar, Ankit [1 ]
Sista, Srinivas [1 ]
Yang, Yang [1 ]
机构
[1] Univ Calif Los Angeles, Dept Mat Sci & Engn, Los Angeles, CA 90095 USA
关键词
FIELD-ASSISTED DISSOCIATION; INTERPENETRATING NETWORK; INTERFACE DIPOLE; RECOMBINATION; PERFORMANCE; ELECTRODES; MECHANISM; METAL;
D O I
10.1063/1.3117513
中图分类号
O59 [应用物理学];
学科分类号
摘要
A kink is sometimes seen in the I-V curves for organic solar cells. In literature charge blocking has been speculated to be responsible for such kind of anomalous features. In this manuscript, we use poly (3-hexylthiophene):[6, 6]-phenyl-C-61-butyric acid methyl ester as our model polymer system and investigate different device structures using ultraviolet photoelectron spectroscopy as our primary tool to investigate the reason for this S-shaped kink. We attribute this anomalous feature to the presence of strong interface dipoles. We further propose a model based on the standard set of Poisson equation, continuity equation, and current density equations including both drift and diffusion components. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3117513]
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页数:6
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