Indirect optical transition due to surface band bending in ZnO nanotubes

被引：25
|
作者：
Yang, L. L. [1 ,2 ]
Zhao, Q. X. [1 ]
Israr, M. Q. [1 ]
Sadaf, J. R. [1 ]
Willander, M. [1 ]
Pozina, G. [3 ]
Yang, J. H. [2 ]
机构：
[1] Linkoping Univ, Dept Sci & Technol ITN, SE-60174 Norrkoping, Sweden
[2] Jilin Normal Univ, Inst Condensed State Phys, Siping 136000, Peoples R China
[3] Linkoping Univ, Dept Phys Chem & Biol IFM, SE-58183 Linkoping, Sweden
来源：
JOURNAL OF APPLIED PHYSICS | 2010年 / 108卷 / 10期
基金：
瑞典研究理事会;
关键词：
TIME-RESOLVED PHOTOLUMINESCENCE; SENSITIZED SOLAR-CELLS; ZINC-OXIDE; NANOWIRE ARRAYS; GROWTH; NANORODS; FILMS; FABRICATION; NANOSTRUCTURES; RECOMBINATION;
D O I：
10.1063/1.3511345
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
ZnO nanotubes (ZNTs) have been successfully evolved from ZnO nanorods (ZNRs) by a simple chemical etching process. Two peaks located at 382 and 384 nm in the UV emission region has been observed in the room temperature photoluminescence (PL) spectrum of ZNTs since the surface band bending in ZNTs induces the coexistence of indirect and direct transitions in their emission process. In addition, a strong enhancement of total luminescence intensity at room temperature in ZNTs has also be observed in comparison with that of ZNRs. Both temperature-dependent PL and time-resolved PL results not only further testify the coexistence of indirect and direct transitions due to the surface band bending but also reveal that less nonradiative contribution to the emission process in ZNTs finally causes their stronger luminescence intensity. (C) 2010 American Institute of Physics. [doi:10.1063/1.3511345]
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页数：7
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