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Optical heterogeneity in three-dimensional organic photovoltaics

发表于 2012-2-1 00:58:01 | 显示全部楼层 |阅读模式

Phys. Rev. B 84, 085206 (2011) [6 pages]

Influence on open-circuit voltage by optical heterogeneity in three-dimensional organic photovoltaics

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Yuan Li1Mingjun Wang1,3Huihui Huang1,3Wanyi Nie1Qi Li2Eric D. Peterson1Robert Coffin1Guojia Fang3, and David L. Carroll1,* 
1Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC 27109, USA
2Department of Physics, Wake Forest University, Winston-Salem, NC 27109, USA
3Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Department of Electronic Science and Technology, School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, P. R. China

Received 19 April 2011; revised 28 June 2011; published 24 August 2011

In three-dimensional photovoltaic architectures, heterogeneous optical intensity distributions throughout the structure may generally lead to modifications to the short circuit current density (Jsc), open-circuit voltage (Voc), and fill factor (FF). In this work an equivalent circuit model has been developed to examine the impact on Voc by heterogeneous and homogeneous internal illumination. The model has been tested against data from planar cell and tube-based solar cells that utilize poly-(3-hexylthiophene): phenyl C61 butyric acid methyl ester (P3HTCBM). This has further been extended to predict optimum optical design for tube-based geometries in which organic photoconversion materials have been applied in both fabrication conditions. The result is that for such geometries to provide the best overall optical confinement and best power conversion performance, aspect ratios must be between 1 and 5. The resulting structure leads to best light capture together with best overall internal partitioning of optical power to achieve the highest possible Voc.

2011 American Physical Society




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