Modifying optical properties of ZnO nanowires via strain-gradient

Fu, Xue-Wen, Fu, Qiang, Kou, Liangzhi, Zhu, Xin-Li, Zhu, Rui, Xu, Jun, Liao, Zhi-Min, Zhao, Qing, Guo, Wan-Lin, & Yu, Dapeng (2013) Modifying optical properties of ZnO nanowires via strain-gradient. Frontiers of Physics, 8(5), pp. 509-515.

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Abstract

We conduct systematical cathodoluminescence study on red-shift of near-band-edge emission energy in elastic bent ZnO nanowires with diameters within the exciton diffusion length (~ 200 nm) in liquid nitrogen temperature (81 K). By charactering the emission spectra of the nanowires with different local curvatures, we find a linear relationship between strain-gradient and the red-shift of near-band-edge emission photon energy, an elastic strain-gradient effect in semiconductor similar to the famous flexoelectric effect in liquid crystals. Our results provide a new route to understand the inhomogeneous strain effect on the energy bands and optical properties of semiconductors and should be useful for designing advanced nano-optoelectronic devices.

Impact and interest:

4 citations in Scopus
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2 citations in Web of Science®

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ID Code: 98220
Item Type: Journal Article
Refereed: Yes
Keywords: cathodoluminescene, energy bands, exciton energy, strain-gradient, ZnO nanowire
DOI: 10.1007/s11467-013-0386-9
ISSN: 2095-0470
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 31 Aug 2016 03:15
Last Modified: 01 Sep 2016 23:43

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