Electron transport and back reaction in nanocrystalline TiO2 films prepared by hydrothermal crystallization
Electron transport and back reaction in nanocrystalline TiO2 films prepared by hydrothermal crystallization
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DOI：
10.1021/jp034918z
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发表时间：
2004-01
影响因子：
3.3
通讯作者：
T. Oekermann;Dongshe Zhang;Tsukasa Yoshida;H. Minoura
中科院分区：
文献类型：
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作者：
T. Oekermann;Dongshe Zhang;Tsukasa Yoshida;H. Minoura
用强度调制光电流谱(IMPS)和强度调制光电压谱(IMVS)研究了用水热晶化新方法在导电玻璃和塑料衬底上低温制备的纳米二氧化钛薄膜中的电子输运和背反应。与低温烧结法相比，水热法制备了无裂纹的二氧化钛厚膜，同时增强了电子传输，为柔性染料敏化太阳能电池提供了一条高效光电极材料的途径。通过对薄膜进行UV/臭氧处理，可以去除水热制备过程中残留的有机物。由于这些有机物代表的表面态介导了电子的反向反应，因此它们的去除延长了电子寿命，而电子输运并没有显著增强。水热法制备的薄膜经高温烧结后，其表面形貌和表面形貌均发生变化。
The electron transport and back reaction in nanocrystalline TiO2 films prepared at low temperature using a new hydrothermal crystallization method on conductive glass and plastic substrates have been investigated by intensity modulated photocurrent spectroscopy (IMPS) and intensity modulated photovoltage spectroscopy (IMVS). The hydrothermal method enables the preparation of crack-free TiO2 thick films and at the same time enhances the electron transport compared to films prepared by low-temperature sintering, providing a path towards efficient photoelectrode materials for flexible dye-sensitized solar cells. UV/ozone treatment of the films enables the removal of residual organics left from the hydrothermal preparation process. Since these organics represent surface states that mediate the back reaction of electrons, the electron lifetime is increased by their removal, while the electron transport is not enhanced significantly. High-temperature sintering of the hydrothermally prepared films leads to both ...