1 State Key Laboratory of Integrated Optoelectronics, Key Laboratory of Automobile Materials of MOE, College of Materials Science and Engineering, Jilin University, Changchun 130012, China; 2 State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
Abstract GaTe is a two-dimensional III-VI semiconductor with suitable direct bandgap of ∼ 1.65 eV and high photoresponsivity, which makes it a promising candidate for optoelectronic applications. GaTe exists in two crystalline phases: monoclinic (m-GaTe, with space group C2/m) and hexagonal (h-GaTe, with space group P63/mmc). The phase transition between the two phases was reported under temperature-varying conditions, such as annealing, laser irradiation, etc. The explicit phase transition temperature and energy barrier during the temperature-induced phase transition have not been explored. In this work, we present a comprehensive study of the phase transition process by using first-principles energetic and phonon calculations within the quasi-harmonic approximation framework. We predicted that the phase transition from h-GaTe to m-GaTe occurs at the temperature decreasing to 261 K. This is in qualitative agreement with the experimental observations. It is a two-step transition process with energy barriers 199 meV and 288 meV, respectively. The relatively high energy barriers demonstrate the irreversible nature of the phase transition. The electronic and phonon properties of the two phases were further investigated by comparison with available experimental and theoretical results. Our results provide insightful understanding on the process of temperature-induced phase transition of GaTe.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62004080), Postdoctoral Innovative Talents Supporting Program (Grant No. BX20190143), China Postdoctoral Science Foundation (2020M670834), and Jilin Province Science and Technology Development Program, China (Grant No. 20190201016JC).
Corresponding Authors: †Xiaoyu Wang and Xue Wang contributed equally to this work. ‡Corresponding author. E-mail: xin_he@jlu.edu.cn§Corresponding author. E-mail: lijun_zhang@jlu.edu.cn
Cite this article:
Xiaoyu Wang(王啸宇), Xue Wang(王雪), Hongshuai Zou(邹洪帅), Yuhao Fu(付钰豪), Xin He(贺欣), and Lijun Zhang(张立军) Temperature-induced phase transition of two-dimensional semiconductor GaTe 2021 Chin. Phys. B 30 016402
A new direct band gap silicon allotrope o-Si32 Xin-Chao Yang(杨鑫超), Qun Wei(魏群), Mei-Guang Zhang(张美光), Ming-Wei Hu(胡明玮), Lin-Qian Li(李林茜), and Xuan-Min Zhu(朱轩民). Chin. Phys. B, 2022, 31(2): 026104.
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