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Materials 2017, 10(11), 1282; https://doi.org/10.3390/ma10111282

Temperature-Dependent Photoluminescence Emission from Unstrained and Strained GaSe Nanosheets

1
School of Physics, Beijing Institute of Technology, Beijing 100081, China
2
Beijing Key Laboratory for Nano-Photonics and Nano-Structure, Elementary Educational College, Capital Normal University, Beijing 100048, China
*
Author to whom correspondence should be addressed.
Received: 30 September 2017 / Revised: 27 October 2017 / Accepted: 7 November 2017 / Published: 8 November 2017
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Abstract

Two-dimensional AIIIBVI layered semiconductors have recently attracted great attention due to their potential applications in piezo-phototronics and optoelectronics. Here, we report the temperature-dependent photoluminescence (PL) of strained and unstrained GaSe flakes. It is found that, as the temperature increases, the PL from both the strained (wrinkled) and unstrained (flat) positions show a prominent red-shift to low energies. However, for the flat case, the slope of PL energy versus temperature at the range of 163–283 K is about −0.36 meV/K, which is smaller than that of the wrinkled one (−0.5 meV/K). This is because more strain can be introduced at the freestanding wrinkled position during the temperature increase, thus accelerates the main PL peak (peak I, direct band gap transition) shift to lower energy. Additionally, for the wrinkled sheet, three new exciton states (peaks III, IV, and V) appear at the red side of peak I, and the emission intensity is highly dependent on the temperature variation. These peaks can be attributed to the bound exciton recombination. These findings demonstrate an interesting route for optical band gap tuning of the layered GaSe sheet, which are important for future optoelectronic device design. View Full-Text
Keywords: GaSe; photoluminescence; strain; temperature dependence GaSe; photoluminescence; strain; temperature dependence
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Zhang, D.; Jia, T.; Dong, R.; Chen, D. Temperature-Dependent Photoluminescence Emission from Unstrained and Strained GaSe Nanosheets. Materials 2017, 10, 1282.

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