Enhanced surface-excitonic emission in ZnO/Al2O3 core-shell nanowires

被引：161

作者：

Richters, J-P ^{[1
]}

Voss, T. ^{[1
]}

Kim, D. S. ^{[2
]}

Scholz, R. ^{[2
]}

Zacharias, M. ^{[3
]}

机构：

[1] Univ Bremen, Inst Semicond Opt, D-28359 Bremen, Germany

[2] Max Planck Inst Microstruct Phys, D-06120 Halle, Germany

[3] Univ Freiburg, Inst Microsyst Engn, D-79110 Freiburg, Germany

来源：

NANOTECHNOLOGY | 2008年 / 19卷 / 30期

关键词：

D O I：

10.1088/0957-4484/19/30/305202

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report the influence of an Al(2)O(3) shell on the photoluminescence emission of ZnO nanowires. At room temperature, the spectrum of the core-shell nanowires shows a strong reduction of the relative intensity of the green defect emission with respect to the near-band-edge emission. At 5 K an increase of the relative intensity of the surface exciton band with respect to the donor-bound exciton emission is observed. Annealing the core-shell nanowires at 500 degrees C does not increase the green defect luminescence at 5 K. We propose a model explaining the spectral changes.

引用

页数：4

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