Photoexcited hole dynamics in TiO2 nanocrystalline films characterized using a lens-free heterodyne detection transient grating technique

被引：50

作者：

Shen, Q

Katayama, K

Sawada, T

Yamaguchi, M

Kumagai, Y

Toyoda, T

机构：

[1] Univ Electrocommun, Dept Chem & Appl Chem, Chofu, Tokyo 1828585, Japan

[2] Univ Electrocommun, Course Coherent Opt Sci, Chofu, Tokyo 1828585, Japan

[3] Kanagawa Acad Sci & Technol, Micro Chem Grp, Kawasaki, Kanagawa 2130012, Japan

[4] Tokyo Univ Agr & Technol, Dept Chem Syst Engn, Koganei, Tokyo 1848588, Japan

[5] Univ Tokyo, Dept Adv Mat Sci, Grad Sch Frontier Sci, Kashiwa, Chiba 2778561, Japan

来源：

CHEMICAL PHYSICS LETTERS | 2006年 / 419卷 / 4-6期

关键词：

D O I：

10.1016/j.cplett.2005.11.109

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A lens-free heterodyne detection transient grating (LF-HD-TG) technique has been applied to study the ultrafast carrier dynamics of anatase and rutile TiO2 films made from TiO2 nanoparticles. The decay of photoexcited hole concentrations in TiO2 films can be directly detected using the technique, since the effective mass of holes in TiO2 is much smaller than that of electrons. We find that the relaxation of holes in anatase occurs via first-order kinetics as fast as 1 ps, which is attributed to a hole trapping process. However, the lifetimes of holes in rutile are found to be longer than hundreds of ps. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：464 / 468

页数：5

共 35 条

[1] THE TRANSPORT AND KINETICS OF PHOTOGENERATED CARRIERS IN COLLOIDAL SEMICONDUCTOR ELECTRODE PARTICLES [J].