electrochemicalimpedancespectraofcdsequantumedotssensitizednanocrystallinetio2solarcells

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	electrochemicalimpedancespectraofcdsequantumedotssensitizednanocrystallinetio2solarcells
	Xu Gang; Xu Xueqing
	2011
Source Publication	sciencechinachemistry
ISSN	1674-7291
Volume	54 Issue:1 Pages:205
Abstract	Quantum dots sensitized nanocrystalline TiO_2 solar cells (QDSSCs) are promising third-generation photovoltaic devices. In comparison with conventional dye-sensitized solar cells (DSSCs), the efficiency of QDSSCs is still very low (about 3%). In this paper, the electrochemical impedance spectroscopy technology has been adopted to investigate the quasi-Fermi level and the carrier dynamics of the colloidal CdSe QDs sensitized TiO_2 eletrode with S~(2-)/S_x~- redox electrolytes and the series resistance of the QDSSCs. In comparison with the conventional DSSCs with F~3/ras redox electrolytes, the energy difference between the conduction band edge and the quasi-Fermi levels of the TiO_2 films (or the Fermi levels of the redox electrolytes) in QDSSCs has been decreased by about 0.3 V, resulting in the decrease of Voc by this value. The increases of the electrolyte diffussion resistance and the charge transfer resistance between Pt counter electrodes and S~(2-)/S_x~- redox electrolytes were attributed to the decrease of the fill factors. However, the electron lifetime and electron diffussion length for QDSSCs are longer than those for DSSCs due to the retardation of the electron recombination by the adsorbed cysteine at the surfaces of the TiO_2 films. It is indicated that electron recombination at the TiO_2/electrolyte interface is not the main reason for the lower Jsc of the colloidal QDs sensitized QDSSCs. Improving light harvesting efficiency and photoelectron injection efficiency should be considered in the future for such kind of QDSSCs
Language	英语
Document Type	期刊论文
Identifier	http://ir.giec.ac.cn/handle/344007/18980
Collection	中国科学院广州能源研究所
Affiliation	中国科学院广州能源研究所
First Author Affilication	GuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation GB/T 7714	Xu Gang,Xu Xueqing. electrochemicalimpedancespectraofcdsequantumedotssensitizednanocrystallinetio2solarcells[J]. sciencechinachemistry,2011,54(1):205.
APA	Xu Gang,&Xu Xueqing.(2011).electrochemicalimpedancespectraofcdsequantumedotssensitizednanocrystallinetio2solarcells.sciencechinachemistry,54(1),205.
MLA	Xu Gang,et al."electrochemicalimpedancespectraofcdsequantumedotssensitizednanocrystallinetio2solarcells".sciencechinachemistry 54.1(2011):205.

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