Enhanced exciton-phonon interactions in photoluminescence of ZnO nanopencils

被引：71

作者：

Ahn, Cheol Hyoun ^{[1
]}

Mohanta, Sanjay Kumar ^{[1
]}

Lee, Nae Eung ^{[1
]}

Cho, Hyung Koun ^{[1
]}

机构：

[1] Sungkyunkwan Univ, Sch Adv Mat Sci & Engn, Suwon 440746, Gyeonggi Do, South Korea

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 26期

关键词：

II-VI semiconductors; nanostructured materials; phonon-exciton interactions; photoluminescence; red shift; silicon; wide band gap semiconductors; zinc compounds; NANORODS;

D O I：

10.1063/1.3159829

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report enhanced exciton-phonon interactions in the photoluminescence (PL) of ZnO nanopencils compared with ZnO nanorods grown on ZnO/Si templates by thermal evaporation. Although the low temperature (< 100 K) PL spectra of ZnO nanorods and nanopencils were dominated by the strong donor-bound exciton, the PL spectra at elevated temperatures (>100 K) showed dominant contributions from the free exciton emissions and phonon-replicas of free excitons for nanorods and nanopencils, respectively. This discrepancy in the behaviors of excitonic emissions of the ZnO nanorods and nanopencils was related to surface defects causing different strengths of exciton-phonon coupling. The different excitonic emissions of the nanorods and nanopencils revealed a 52 meV redshift in the room temperature PL of nanopencils.

引用

页数：3

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