Core-shell nanoporous electrode for dye sensitized solar cells:: the effect of the SrTiO3 shell on the electronic properties of the TiO2 core
Core-shell nanoporous electrode for dye sensitized solar cells:: the effect of the SrTiO3 shell on the electronic properties of the TiO2 core
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DOI：
10.1021/jp027827v
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发表时间：
2003-03-06
影响因子：
3.3
通讯作者：
Zaban, A
中科院分区：
文献类型：
--
作者：
Diamant, Y;Chen, SG;Zaban, A
合成了一种用于光电化学应用的纳米多孔TiO 2电极。引入这种核-壳电极的染料敏化太阳能电池增加了开路光电压，同时减少了短路光电流相比，含有标准的未涂覆的二氧化钛电极的电池。光电压的增加比光电流的减少更显著，导致太阳能电池的总转换效率提高了15%。采用光电流-电压相关、光谱电化学、暗电流测量、IPCE和光电压谱等方法对TiO 2-SrTiO 3核壳电极在染料敏化太阳能电池中的性能进行了分析。结果表明，SrTiO 3层的TiO 2的导带在负方向上移动，而不是形成能量势垒在TiO 2/电解质界面处发现类似的涂层由其他材料。TiO 2能带的位移归因于SrTiO 3涂层诱导的表面偶极子。
A nanoporous TiO2 electrode coated with a thin SrTiO3 layer was synthesized for photoelectrochemical applications. Introduction of this core-shell electrode to a dye sensitized solar cell increased the open circuit photovoltage while reducing the short circuit photocurrent in comparison with a cell containing the standard noncoated TiO2 electrode. The photovoltage increases is more significant than the photocurrent reduction resulting in a 15% improvement of the overall conversion efficiency of the solar cell. The performance of the TiO2-SrTiO3 core-shell electrode in the dye sensitized solar cell was analyzed by several methods including photocurrent-voltage correlation, spectro-electrochemistry, dark current measurement, IPCE, and photovoltage spectroscopy. The results indicate that the SrTiO3 layer shifts the conduction band of the TiO2 in the negative direction rather than forming energy barrier at the TiO2/electrolyte interface as found for similar coating by other materials. The shift of the TiO2 bands is attributed to a surface dipole that is induced by the SrTiO3 coating.