Efficiency Enhancement of Dye-Sensitized Solar Cells: UsingSalt CuI as an Additive in an Ionic Liquid

Chen Lie-Hang; Xue Bo-Fei; Liu Xi-Zhe; Li Ke-Xin; Luo Yan-Hong; Meng Qing-Bo; Wang Rui-Lin; Chen Li-Quan

doi:10.1088/0256-307X/24/2/071

Chinese Physics Letters

Efficiency Enhancement of Dye-Sensitized Solar Cells: Using Salt CuI as an Additive in an Ionic Liquid

Chen Lie-Hang^1,2, Xue Bo-Fei², Liu Xi-Zhe², Li Ke-Xin², Luo Yan-Hong², Meng Qing-Bo², Wang Rui-Lin¹ and Chen Li-Quan²

Published under licence by IOP Publishing Ltd
Chinese Physics Letters, Volume 24, Number 2 Citation Chen Lie-Hang et al 2007 Chinese Phys. Lett. 24 555 DOI 10.1088/0256-307X/24/2/071

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¹ College of Materials Science and Engineering, Sichuan University, Chengdu 610064

² Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080

Dates

Received 23 October 2006

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Abstract

Energy conversion efficiency of the dye-sensitized solar cell is improved from 3.5% to 4.5% by adding a small amount of CuI into an ionic liquid electrolyte. It is found that other copper-I salts, for example, CuBr, have the same effect for the dye-sensitized solar cell. Experimental results show that no Cu²⁺ ions exist in this electrolyte. It is suggested that this improvement is caused by the adsorption of Cu⁺ onto the TiO₂ porous film.

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