Abstract
We have fabricated inverted heterojunction solar cell devices incorporating [6,6]-phenyl-C61-butyric acid methyl ester/poly(3-hexylthiophene) core/shell nanorod arrays by using ananodic alumina oxide template. The internal quantum efficiencies and external quantumefficiencies of these core/shell nanorod inverted solar cells were higher than those of thecorresponding conventional inverted bulk heterojunction device. The optimized nanorodarray structure had a high hole mobility that was over one order magnitude greater thanthat of the conventional bulk heterojunction structure, as determined by fitting the darkJ–V curves into the space charge limited current model. The more efficient carriertransport of the device incorporating the core/shell nanorod arrays provided itwith both a higher short-circuit current density and power conversion efficiency.
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