The Electronic Role of the TiO2 Light-Scattering Layer in Dye-Sensitized Solar Cells
The Electronic Role of the TiO2 Light-Scattering Layer in Dye-Sensitized Solar Cells
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DOI：
10.1524/zpch.2007.221.3.319
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发表时间：
2007-03
期刊：
影响因子：
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通讯作者：
Zhipan Zhang;S. Ito;B. O'Regan;D. Kuang;S. M. Zakeeruddin;P. Liska;Raphaël Charvet;P. Comte;M. Nazeeruddin;P. Péchy;R. Humphry‐Baker;T. Koyanagi;T. Mizuno;M. Grätzel
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文献类型：
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作者：
Zhipan Zhang;S. Ito;B. O'Regan;D. Kuang;S. M. Zakeeruddin;P. Liska;Raphaël Charvet;P. Comte;M. Nazeeruddin;P. Péchy;R. Humphry‐Baker;T. Koyanagi;T. Mizuno;M. Grätzel
采用不同种类的TiO2薄膜，包括SiO2包覆的TiO2微粒和裸TiO2微粒作为光散射层，制备了染料敏化太阳能电池。结果表明，LSL对电池的暗电流几乎没有影响，而在光照下，LSL对总光电流有显著的贡献。在偏置照明下进行的光电压衰减测量显示LSL的电子态密度（DOS）比透明纳米颗粒层（TNL）的电子态密度小两倍。引人注目的是，仅由4.5μm厚的LSL制造的DSC显示出5%的转换效率，尽管颜色为淡粉红色。这种令人印象深刻的性能归因于LSL中的光容纳和低密度的缺陷电子态。
Dye-sensitized solar cells have been fabricated with different kinds of TiO2 films including SiO2 coated and bare TiO2 microparticles as light-scattering layer (LSL). Results show that the LSL barely affects the cell's dark current, whereas under illumination, it made a significant contribution to the total photocurrent. Photo-voltage decay measurements performed under bias illumination show the density of electronic states (DOS) of the LSL to be two times smaller than that of a transparent nanoparticle layer (TNL). Strikingly, DSCs fabricated from a 4.5μm thick LSL alone showed a conversion efficiency of 5% despite of being pale pink in color. This impressive performance is attributed to light containment in the LSL and a low density of defect electronic states.