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An Unconventional Route to High-Efficiency Dye-Sensitized Solar Cells via Embedding Graphitic Thin Films into TiO2 Nanoparticle Photoanode

by: Yoon H. Jang, Xukai Xin, Myunghwan Byun, Yu J. Jang, Zhiqun Lin, Dong H. Kim
Nano Lett. In Nano Letters, Vol. 12, No. 1. (12 December 2011), pp. 479-485, doi:10.1021/nl203901m  Key: citeulike:11576942

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Abstract

Graphitic thin films embedded with highly dispersed titanium dioxide (TiO2) nanoparticles were incorporated for the first time into the conventional dye-sensitized solar cells (DSSCs), resulting in a remarkably improved cell efficiency due to its superior electron conductivity. Massively ordered arrays of TiO2 dots embedded in carbon matrix were fabricated via UV-stabilization of polystyrene-block-poly(4-vinylpyridine) films containing TiO2 precursors followed by direct carbonization. For dye-sensitized TiO2 based solar cells containing carbon/TiO2 thin layers at both sides of pristine TiO2 layer, an increase of 40.6% in overall power conversion efficiency was achieved compared with neat TiO2-based DSSCs. Such a remarkably improved cell efficiency was ascribed to the superior electron conductivity and extended electron lifetime elucidated by cyclic voltammetry and impedance spectroscopy.


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