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The increased interface charge transfer in dye-sensitized solar cellsbased on well-ordered TiO2 nanotube arrays with differentlengths

Published online by Cambridge University Press:  31 March 2014

Lihong Qi ,
Zhuoxun Yin ,
Shen Zhang ,
Qiuyun Ouyang ,
Chunyan Li  and
Yujin Chen
Lihong Qi*
Affiliation:
College of Science, Harbin Engineering University, Harbin 150001, People's Republic of China
Zhuoxun Yin
Affiliation:
College of Science, Harbin Engineering University, Harbin 150001, People's Republic of China
Shen Zhang
Affiliation:
College of Science, Harbin Engineering University, Harbin 150001, People's Republic of China
Qiuyun Ouyang
Affiliation:
College of Science, Harbin Engineering University, Harbin 150001, People's Republic of China
Chunyan Li*
Affiliation:
College of Science, Harbin Engineering University, Harbin 150001, People's Republic of China
Yujin Chen
Affiliation:
College of Science, Harbin Engineering University, Harbin 150001, People's Republic of China
*
a)Address all correspondence to thisauthor. e-mail: lihongqi@hrbeu.edu.cn
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Abstract

The well-ordered TiO2 nanotube arrays with controlled aspect ratio arefabricated via potentiostatic anodization. The aspect ratio of TiO2nanotube array can be tuned conveniently by changing the water content inelectrolyte and anodization time. The formation of well-ordered TiO2nanotube array is good for the photogenerated electron transfer. So, thewell-ordered TiO2 nanotube array photoelectrodes have been used tofabricate dye-sensitized solar cells (DSSCs). It is found that, with the optimumnanotube length and aspect ratio, DSSCs with TiO2 nanotube arrayphotoelectrodes show better photoelectric conversion efficiency (2.60%) thanthat with TiO2 nanoparticles on Ti foil photoelectrode. It iselucidated by the interfacial electron transport of DSSCs, which arecharacterized quantitatively, using the electrochemical impedance spectra. TheDSSC with optimal nanotube length and aspect ratio displays the fastestinterfacial electron transfer and longer electron lifetime.

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Type
Articles
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Journal of Materials Research , Volume 29 , Issue 6 , 28 March 2014 , pp. 745 - 752
Copyright
Copyright © Materials Research Society 2014 

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References

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