Double-layer composite film based on sponge-like TiO2 and P25 as photoelectrode for enhanced efficiency in dye-sensitized solar cells

被引：44

作者：

Dai, Guotian ^{[1
]}

Zhao, Li ^{[1
]}

Wang, Shimin ^{[1
]}

Hu, Jinhua ^{[1
]}

Dong, Binghai ^{[1
]}

Lu, Hongbing ^{[1
]}

Li, Jing ^{[1
]}

机构：

[1] Hubei Univ, Fac Mat Sci & Engn, Minist Educ, Key Lab Green Preparat & Applicat Funct Mat, Wuhan 430062, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2012年 / 539卷

基金：

湖北省教育厅重点项目;

关键词：

Nanoparticle; Sponge-like macro-/mesoporous TiO2; Double-layer composite film; Dye-sensitized solar cell; PHOTOCATALYTIC ACTIVITY; LIGHT-SCATTERING; PERFORMANCE; NANOWIRES; ELECTRODE; ARRAYS; OXIDE;

D O I：

10.1016/j.jallcom.2012.06.046

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A TiO2 double-layer composite film consisting of hierarchically sponge-like macro-/mesoporous TiO2 (HSMM-TiO2) as overlayer and commercial-grade TiO2 nanoparticles (P25) as underlayer is designed as the photoelectrode of dye-sensitized solar cells (DSSCs). The photoelectric conversion performances of DSSCs based on P25 nanoparticle film, HSMM-TiO2 film, and P25/HSMM-TiO2 double-layer composite film are investigated and compared. It is found that the overall energy-conversion efficiency of 5.48% is achieved by the formation of P25/HSMM-TiO2 double-layer composite film, which is 51.4% higher than that formed by P25 nanoparticle film (eta = 3.62%) and 27.1% higher than that formed by HSMM-TiO2 film (eta = 4.31%) under identical film thickness (ca. 20 mu m) at a constant irradiation of 100 mWcm(-2). The enhanced conversion efficiency of TiO2 double-layer composite film can be attributed to the combined effect of the following factors. The HSMM-TiO2 overlayer enhances light-harvesting efficiency due to its intense light scattering and the P25 nanoparticle underlayer ensures good electronic contact between TiO2 film and the F-doped tin oxide (FTO) glass. Furthermore, the high specific surface area and special pore-wall structure of HSMM-TiO2 are respectively beneficial to adsorption of dye molecules and transport of both electrons and electrolytes. (C) 2012 Elsevier B. V. All rights reserved.

引用

页码：264 / 270

页数：7

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