Transient photoconductivity of nanocrystalline TiO2 sol-gel thin films

被引：69

作者：

Pomoni, K ^{[1
]}

Vomvas, A

Trapalis, C

机构：

[1] Univ Patras, Dept Phys, Patras 26500, Greece

[2] Natl Ctr Sci Res Demokritos, Inst Sci Mat, Athens 15310, Greece

来源：

THIN SOLID FILMS | 2005年 / 479卷 / 1-2期

关键词：

transient photoconductivity; TiO2; sol-gel; nanocrystalline;

D O I：

10.1016/j.tsf.2004.12.005

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thin TiO2 sol gel films were prepared using the dip-coating technique. The transient photoconductivity was studied in vacuum and in air as a function of temperature and light intensity. The dark conductivity in vacuum is much larger than that in air and they are both thermally activated. The transient photoconductivity rises slowly in vacuum saturating in days, and is much larger than that in air, which reaches a maximum within the first few minutes of illumination. The larger values in vacuum can be attributed to the reduced amount of adsorbed oxygen at the surface, which acts as electron scavenger. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：160 / 165

页数：6

共 15 条

[11] Density of band-gap traps in polycrystalline films from photoconductivity transients using an improved Laplace transform method [J].