Citation: WANG Shi-Mao, DONG Wei-Wei, FANG Xiao-Dong, DENG Zan-Hong, SHAO Jing-Zhen, HU Lin-Hua, ZHU Jun. Modification of Single-Crystal TiO₂ Nanorod Arrays and Its Application in Quantum Dot-Sensitized Solar Cells[J]. Acta Physico-Chimica Sinica, ;2014, 30(5): 873-880. doi: 10.3866/PKU.WHXB201403042 shu

Modification of Single-Crystal TiO₂ Nanorod Arrays and Its Application in Quantum Dot-Sensitized Solar Cells

WANG Shi-Mao ¹ ,
DONG Wei-Wei ^1,2, ,
FANG Xiao-Dong ^1,2, ,
DENG Zan-Hong ^1,2 ,
SHAO Jing-Zhen ^1,2 ,
HU Lin-Hua ² ,
ZHU Jun ²

1.
1 Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, P. R. China;
2 Key Laboratory of Novel Thin Film Solar Cells, Chinese Academy of Sciences, Hefei 230031, P. R. China

Received Date: 13 January 2014
Available Online: 4 March 2014
Fund Project:

Single-crystal TiO₂ nanorod arrays (TNRs) are proposed to increase the electron transport rate and improve the cell performance of quantum dot- sensitized solar cells (QDSCs). However, the specific surface area of TNRs is much lower than that of TiO₂ nanoparticle films, which leads to lower quantum dot adsorption and lower power conversion efficiency (η). In our investigation, TiCl₄ solution was used to modify single-crystal rutile TNRs. The modification resulted in the synthesis of a large number of TiO₂ nanoparticles on the surfaces of nanorods, which significantly increased the surface area and quantum dot adsorption of TNRs. When the TiCl₄ modification time was 60 h, the short-circuit photocurrent density (J_sc) and η of TNRs based CdS/CdSe co-sensitized QDSCs increased from (2.93±0.07) mA·cm^-2 and 0.36%±0.02% to (8.19±0.12) mA·cm^-2 and 1.17%±0.07%, respectively. In addition, intensity modulated photocurrent spectroscopy measurements indicated that the electron transport rate in modified single-crystal rutile TNRs is faster than that in anatase TiO₂ nanoparticle films, which is a desirable result.
- Quantum dot-sensitized solar cell,
- Photoanode,
- Titanium dioxide,
- Nanorod array,
- Modification,
- Electron transport
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Modification of Single-Crystal TiO₂ Nanorod Arrays and Its Application in Quantum Dot-Sensitized Solar Cells