The heterojunction effects of TiO2 nanotubes fabricated by atomic layer deposition on photocarrier transportation direction

被引：30

作者：

Chang, Yung-Huang ^{[1
]}

Liu, Chien-Min ^{[1
]}

Chen, Chih ^{[1
]}

Cheng, Hsyi-En ^{[2
]}

机构：

[1] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[2] So Taiwan Univ, Dept Electroopt Engn, Tainan 710, Taiwan

来源：

NANOSCALE RESEARCH LETTERS | 2012年 / 7卷

关键词：

ARRAYS; WATER;

D O I：

10.1186/1556-276X-7-231

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The heterojunction effects of TiO2 nanotubes on photoconductive characteristics were investigated. For ITO/TiO2/Si diodes, the photocurrent is controlled either by the TiO2/Si heterojunction (p-n junction) or the ITO-TiO2 heterojunction (Schottky contact). In the short circuit (approximately 0 V) condition, the TiO2-Si heterojunction dominates the photocarrier transportation direction due to its larger space-charge region and potential gradient. The detailed transition process of the photocarrier direction was investigated with a time-dependent photoresponse study. The results showed that the diode transitioned from TiO2-Si heterojunction-controlled to ITO-TiO2 heterojunction-controlled as we applied biases from approximately 0 to -1 V on the ITO electrode.

引用

页数：7

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