Free standing TiO2 nanotube array electrodes with an ultra-thin Al2O3 barrier layer and TiCl4 surface modification for highly efficient dye sensitized solar cells
Free standing TiO2 nanotube array electrodes with an ultra-thin Al2O3 barrier layer and TiCl4 surface modification for highly efficient dye sensitized solar cells
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DOI：
10.1039/c3nr03198e
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发表时间：
2013-01-01
期刊：
影响因子：
6.7
通讯作者：
Yuan, Chris
中科院分区：
文献类型：
--
作者：
Gao, Xianfeng;Guan, Dongsheng;Yuan, Chris
采用模板辅助原子层沉积法（ALD）制备了具有精确壁厚控制的自支撑TiO2纳米管（TNT）阵列薄膜，并以此制备了染料敏化太阳能电池。通过使用Al2O3阻挡层涂层结合TiCl4表面改性来努力改善光伏性能。通过ALD在TNT电极上沉积Al2O3薄层以用作电荷复合阻挡层，但是当阻挡层变得太厚时，它遭受减少从染料到TiO2的光电子注入的缺点。通过TiCl 4处理结合最佳厚度的涂层，可以避免这个问题。复合处理后的电极具有上级的表面性质，复合率低，电子传输性能好。获得了8.62%的高转换效率，约为未经表面修饰的器件的1.8倍。
Dye sensitized solar cells were fabricated with free standing TiO2 nanotube (TNT) array films, which were prepared by template assisted atomic layer deposition (ALD) with precise wall thickness control. Efforts to improve the photovoltaic performance were made by using Al2O3 barrier layer coating in conjunction with TiCl4 surface modification. An Al2O3 thin layer was deposited on the TNT electrode by ALD to serve as the charge recombination barrier, but it suffers from the drawback of decreasing the photoelectron injection from dye into TiO2 when the barrier layer became too thick. With the TiCl4 treatment in combination with optimal thickness coating, this problem could be avoided. The co-surface treated electrode presents superior surface property with low recombination rate and good electron transport property. A high conversion efficiency of 8.62% is obtained, which is about 1.8 times that of the device without surface modifications.