Enhanced Photoelectrochemical Performance of TiO2 Nanorod Arrays by a 500A°C Annealing in Air: Insights into the Mechanism

被引：25

作者：

Zhang, Shuang ^{[1
]}

Gu, Xiuquan ^{[1
]}

Zhao, Yulong ^{[1
]}

Qiang, Yinghuai ^{[1
]}

机构：

[1] China Univ Min & Technol, Sch Mat Sci & Engn, Xuzhou 221116, Peoples R China

来源：

JOURNAL OF ELECTRONIC MATERIALS | 2016年 / 45卷 / 01期

关键词：

Annealing; photoelectrochemical; TiO2; nanorod array; Mott-Schottky; NANOTUBE ARRAYS; SOLAR; CELLS; WATER;

D O I：

10.1007/s11664-015-4166-x

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Oriented, single-crystal TiO2 nanorod arrays (NRAs) were synthesized for photoelectrochemical (PEC) water-splitting by a facile hydrothermal route. It was observed that a 500A degrees C annealing process facilitated enhancing the PEC activity of TiO2 NRAs, in agreement with our previous reports on NRA-related solar cells. Further, electrochemical impedance measurements were employed to investigate the underlying mechanism. Compared with pristine TiO2 NRAs, the 500A degrees C sintered samples showed a positive flat-band shifting of similar to 0.12 V as well as a suppression of the donor density. Thus, suggesting that the enhanced PEC performance might be attributed to the widening of depletion layer regions due to the reduction of crystal defects after sintering. The mechanism was also expanded to explain why the dye-sensitized solar cells made with sintered TiO2 NRAs exhibited an 11-times higher power conversion efficiency than those consisting of pristine arrays.

引用

页码：648 / 653

页数：6

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