Charge Recombination and Band-Edge Shift in the Dye-Sensitized Mg2+-Doped TiO2 Solar Cells

被引:83
作者
Zhang, Changneng [1 ]
Chen, Shuanghong [1 ]
Mo, Li'e [1 ]
Huang, Yang [1 ]
Tian, Huajun [1 ]
Hu, Linhua [1 ]
Huo, Zhipeng [1 ]
Dai, Songyuan [1 ]
Kong, Fantai [1 ]
Pan, Xu [1 ]
机构
[1] Chinese Acad Sci, Inst Plasma Phys, Key Lab Novel Thin Film Solar Cells, Hefei 230031, Anhui, Peoples R China
基金
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词
RUTHENIUM SENSITIZERS; SURFACE PASSIVATION; PERFORMANCE; SPECTROSCOPY; ELECTRODES; EFFICIENCY; ELECTROLYTES; PHOTOVOLTAGE; COLLECTION; CONVERSION;
D O I
10.1021/jp2024318
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
The effect of Mg2+ ions substituted into the anatase lattice on the charge recombination and band-edge movement in dye-sensitized solar cells was investigated in this study. The HRTEM results indicated that Mg2+ ions incorporation into the TiO2 lattice led to the increased lattice spacing of the (101) plane of the anatase phase. Mg2+-doped TiO2 could produce a blue shift in the optical absorption edge compared with that of the untreated samples. Detailed analysis of the open-circuit photovoltage (V-oc) under different surface charge densities showed that the Mg2+-doped TiO2 samples resulted in the negative shift of the TiO2 conduction band about 70 mV in comparison with the untreated samples. From Raman spectra and light intensity-dependent variation of the short-circuit current density (J(sc)) of the solar cells, it could be concluded that the decreased efficiency of electron injection for DSCs with Mg2+-doped TiO2 was attributed to the negative shift of the band edge in the Mg2+-doped TiO2 electrode to obtain a decreased J(sc). The electron diffusion coefficient in Mg2+-doped TiO2 was found to be higher than that in TiO2 at the same photoelectron density. We present evidence that the increase of trap states in Mg2+-doped TiO2 as recombination channels to decrease the electron lifetime could compensate for the effect of band-gap widening to obtain a slightly increased V-oc., for DSCs with Mg2+-doped TiO2. It is suggested that the recombination channels should be suppressed to enhance the performance of dye-sensitized Mg2+-doped TiO2 solar cells.
引用
收藏
页码:16418 / 16424
页数:7
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