Effect of atmospheres on the open-circuit photovoltage of nanoporous TiO2/poly(3-hexylthiophene) heterojunction solar cell

被引:43
作者
Watanabe, A [1 ]
Kasuya, A
机构
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Interdisciplinary Res Ctr, Sendai, Miyagi 9808578, Japan
关键词
nanostructure; organic semiconductor; solar cells; titanium dioxide;
D O I
10.1016/j.tsf.2004.12.056
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Photovoltaic properties of the nanoporous titanium dioxide TiO2/Poly(3-hexylthiophene) heterojunction solar cell are studied by photovoltammetry under periodic photoirradiation, which is effective in examining the photo- and dark-current potential profiles simultaneously in the same experiment. The open-circuit voltage (V-oc) of the TiO2/poly(3-hexylthiophene) cell significantly depends on the atmosphere in the measurements. Accompanying the increase of the dark current, the photovoltammogram in vacuo shows the lower V-oc than that in air. The stepwise increase of the dark current after pulse irradiation is observed in the transient current-time profiles for the TiO2/poly(3-hexylthiophene) cell in vacuo. The difference spectra of the TiO2/poly(3-hexylthiophene) cell during photoirradiation in vacuo show the increase of a broad absorption band attributed to trapped charge carriers in the near-IR region, which is the origin of the dark current increment. The photovoltaic properties of the TiO2/Poly(3-hexylthiophene) heterojunction are seriously affected by the trapped charge carriers. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:358 / 366
页数:9
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