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Nanotechnology. 2010 Apr 9;21(14):145203. doi: 10.1088/0957-4484/21/14/145203. Epub 2010 Mar 11.

Inverted heterojunction solar cells incorporating fullerene/polythiophene composite core/shell nanorod arrays.

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1
Department of Materials Science and Engineering, National Chiao Tung University, Taiwan, Republic of China.

Abstract

We have fabricated inverted heterojunction solar cell devices incorporating [6,6]-phenyl-C(61)-butyric acid methyl ester/poly(3-hexylthiophene) core/shell nanorod arrays by using an anodic alumina oxide template. The internal quantum efficiencies and external quantum efficiencies of these core/shell nanorod inverted solar cells were higher than those of the corresponding conventional inverted bulk heterojunction device. The optimized nanorod array structure had a high hole mobility that was over one order magnitude greater than that of the conventional bulk heterojunction structure, as determined by fitting the dark J-V curves into the space charge limited current model. The more efficient carrier transport of the device incorporating the core/shell nanorod arrays provided it with both a higher short-circuit current density and power conversion efficiency.

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