Influence of ZnO seed crystals and annealing on the optical quality of low-temperature grown ZnO nanorods

被引：38

作者：

Bekeny, C.

Voss, T.

Hilker, B.

Gutowski, J.

Hauschild, R.

Kalt, H.

Postels, B.

Bakin, A.

Waag, A.

机构：

[1] Univ Bremen, Inst Festkorperphys, D-28334 Bremen, Germany

[2] Univ Karlsruhe, Inst Angew Phys, D-76131 Karlsruhe, Germany

[3] Tech Univ Carolo Wilhelmina Braunschweig, Inst Halbleitertech, D-38023 Braunschweig, Germany

来源：

JOURNAL OF APPLIED PHYSICS | 2007年 / 102卷 / 04期

关键词：

D O I：

10.1063/1.2773632

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The influence of ZnO seed crystals and postgrowth annealing on low-temperature aqueous chemically grown ZnO nanorods is analyzed. At the seed crystal/nanorod interface a high density of structural defects leads to emission at 3.332 eV, attributed to excitons bound to structural defects. This peak is absent for seed crystals, very pronounced for rods of shorter lengths grown on seed crystals, and reduced for longer nanorods. After annealing in oxygen and nitrogen atmosphere, the near-band-edge excitonic transitions sharpen and deep-level emission is strongly reduced. Time-resolved photoluminescence measurements show a striking similarity between donor-bound excitons and excitons bound to structural defects.

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页数：5

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