Long lifetime of free excitons in ZnO tetrapod structures

被引：35

作者：

Lee, S. -K. ^{[1
]}

Chen, S. L. ^{[1
]}

Hongxing, D. ^{[2
]}

Sun, L. ^{[2
]}

Chen, Z. ^{[2
]}

Chen, W. M. ^{[1
]}

Buyanova, I. A. ^{[1
]}

机构：

[1] Linkoping Univ, Dept Phys Chem & Biol, S-58183 Linkoping, Sweden

[2] Fudan Univ, Surface Phys Lab, Dept Phys, Shanghai 200433, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 96卷 / 08期

关键词：

excitons; II-VI semiconductors; photoluminescence; radiative lifetimes; time resolved spectra; wide band gap semiconductors; zinc compounds; PHOTOLUMINESCENCE LIFETIME; NANORODS;

D O I：

10.1063/1.3328099

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Time-resolved photoluminescence (PL) is employed to characterize optical quality of ZnO tetrapods. PL decay of free excitons (FE) is concluded to contain two components with time constants of 1 and 14 ns at room temperature. The fast PL decay is attributed to nonradiative recombination whereas the slow decay is suggested to mainly represent FE radiative lifetime, based on correlation between thermally induced increases in the PL linewidth and FE lifetimes. The results underline superior optical quality of the tetrapods as the decay time of the slow PL component is comparable to the longest lifetimes reported to date for ZnO.

引用

页数：3

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