中国物理B ›› 2021, Vol. 30 ›› Issue (1): 16402-.doi: 10.1088/1674-1056/abd394

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  • 收稿日期:2020-11-08 修回日期:2020-11-23 接受日期:2020-11-25 出版日期:2020-12-17 发布日期:2020-12-17

Temperature-induced phase transition of two-dimensional semiconductor GaTe

Xiaoyu Wang(王啸宇)1,†, Xue Wang(王雪)1,†, Hongshuai Zou(邹洪帅)1, Yuhao Fu(付钰豪)2, Xin He(贺欣)1,‡, and Lijun Zhang(张立军)1,§   

  1. 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
  • Received:2020-11-08 Revised:2020-11-23 Accepted:2020-11-25 Online:2020-12-17 Published:2020-12-17
  • Contact: †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
  • Supported by:
    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).

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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.

Key words: two-dimensional semiconductor GaTe, temperature-induced phase transition, first-principles calculation, quasi-harmonic approximation

中图分类号:  (General studies of phase transitions)

  • 64.60.-i
71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 81.05.Hd (Other semiconductors)