Towards optimization of device performance in conjugated polymer photovoltaics:: Charge generation, transfer and transport in poly(p-phenylene-vinylene) polymer heterojunctions

被引:26
作者
Chasteen, Stephanie V. [1 ]
Sholin, Veronica [2 ]
Carter, Sue A. [2 ]
Rumbles, Garry [3 ]
机构
[1] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
[2] Univ Calif Santa Cruz, Dept Phys, Santa Cruz, CA 95064 USA
[3] Natl Renewable Energy Lab, Ctr Bas Sci, Golden, CO 80401 USA
关键词
organic photovoltaic; photoluminescence; time-resolved; heterojunction; fullerene;
D O I
10.1016/j.solmat.2008.01.014
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
We fabricate photovoltaics comprised layers and blends of a hole-transporting derivative of poly(p-phenylene-vinylene) with a variety of electron-transporters: titanium dioxide, a cyano-substituted PPV, and a fullerene derivative (PCBM) to enhance device performance. Photovoltaic device characterization is combined with time-resolved and steady-state photoluminescence to understand the nature of the excited state and its effect upon device performance. We find that morphological differences, such as chain conformation or domain size, often overshadow the effect of charge transfer, so that device performance is not necessarily correlated with rapid decay times. Exciton generation is found to be a similarly important factor in most devices. These results provide insight into non-optimized device morphologies. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:651 / 659
页数:9
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