Realizing high visible-light-induced carriers mobility in TiO2-based photoanodes
Realizing high visible-light-induced carriers mobility in TiO2-based photoanodes
复制标题
在 TiO2 光电阳极中实现高可见光诱导载流子迁移率
DOI：
10.1016/j.jpowsour.2013.11.057
复制
发表时间：
2014-04
影响因子：
9.2
通讯作者：
Wei, Shiqiang
中科院分区：
文献类型：
--
作者：
He, Bo;Wu, Ziyu;Yan, Wensheng;Wei, Shiqiang
提高可见光区域的量子转换效率是光电化学（PEC）水分解过程中高效利用太阳能的关键问题。在此，基于N阴离子和S阳离子共掺杂TiO2薄膜光阳极，我们在实验和理论上发现，通过设计掺杂剂电子能态可以显着增强可见光诱导载流子的传输能力。通过离域引入的能带，空穴传输电阻率从 6.8 × 104 降低到 1.3 × 104 Ω m，导致 450-550 nm 可见光区域内量子效率从 5% 明显增加到 20%。进一步的DFT计算表明，隔离带的分裂是由强N和S杂化引起的，这有利于降低空穴有效质量并将空穴迁移率提高三倍。 N−S共掺杂TiO2薄膜的光电流是单掺杂情况的两倍，这是掺杂改性TiO2薄膜光阳极的最佳值。这项工作不仅可以提供设计原理，还可以为定制和优化 TiO2 以实现高 PEC 活性提供候选方案。
Increasing the quantum conversion efficiency in visible-light region is a key issue for the efficient usage of solar energy in the process of photoelectrochemical (PEC) water splitting. Here, based on the N anion and S cation codoped TiO2thin film photoanodes, we find experimentally and theoretically that the transport ability of visible-light-induced carriers can be notably enhanced by engineering the dopant electronic energy states. The hole transport resistivity is decreased from 6.8 × 104to 1.3 × 104Ω m via delocalizing the introduced bands, leading to an evident increase of the internal quantum efficiency from 5% to 20% at the visible-light region of 450–550 nm. Further DFT calculations exhibit that the split of the isolated band is induced by a strong N and S hybridization, which favors to decrease the hole effective mass and to improve the hole mobility by three times. The photocurrent of N − S codoped TiO2thin film is thus twice that of monodoping cases, the best value for doping modified TiO2thin film photoanodes. This work may provide not only a design principle but also a candidate for tailoring and optimizing TiO2towards high PEC activity.
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影响因子：
3.7
作者：
Jingfu He;Qinghua Liu;Zhihu Sun;Wensheng Yan;Guobin Zhang;Z. Qi;P. Xu;Ziyu Wu;Shiqiang Wei
通讯作者：
Jingfu He;Qinghua Liu;Zhihu Sun;Wensheng Yan;Guobin Zhang;Z. Qi;P. Xu;Ziyu Wu;Shiqiang Wei
影响因子：
3.7
作者：
Kresse, G;Furthmuller, J
通讯作者：
Furthmuller, J
影响因子：
3.7
作者：
MONKHORST, HJ;PACK, JD
通讯作者：
PACK, JD
影响因子：
3.7
作者：
MONKHORST, HJ;PACK, JD
通讯作者：
PACK, JD
DOI：
10.1142/11041
发表时间：
2018-06
期刊：
--
影响因子：
--
作者：
A. Aharonî;O. Entin-Wohlman
通讯作者：
A. Aharonî;O. Entin-Wohlman