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Linear strain-gradient effect on the energy bandgap in bent CdS nanowires

Fu, Qiang and Zhang, Zi Yue and Kou, Liangzhi and Wu, Peicai and Han, Xiaobing and Zhu, Xinli and Gao, Jingyun and Xu, Jun and Zhao, Qing and Guo, Wanlin and Yu, Dapeng (2011) Linear strain-gradient effect on the energy bandgap in bent CdS nanowires. Nano Research, 4 (3). pp. 308-314.

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Official URL: http://www.springerlink.com/content/w2j0752p6264gg...

Abstract

Although possible non-homogeneous strain effects in semiconductors have been investigated for over a half century and the strain-gradient can be over 1% per micrometer in flexible nanostructures, we still lack an understanding of their influence on energy bands. Here we conduct a systematic cathodoluminescence spectroscopy study of the strain-gradient induced exciton energy shift in elastically curved CdS nanowires at low temperature, and find that the red-shift of the exciton energy in the curved nanowires is proportional to the strain-gradient, an index of lattice distortion. Density functional calculations show the same trend of band gap reduction in curved nanostructures and reveal the underlying mechanism. The significant linear strain-gradient effect on the band gap of semiconductors should shed new light on ways to tune optical-electronic properties in nanoelectronics.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10647
Deposited By:JNCASR
Deposited On:30 Apr 2011 06:32
Last Modified:30 Apr 2011 06:32

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