期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 26, 页码 23353-23360出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b06425
关键词
2D materials; chemical vapor deposition; GeSe; p-type semiconductor; phototransistor
资金
- National Natural Science Foundation of China [21825103, 51727809, 11774239, 11804230, 51802103]
- National Basic Research Foundation of China [2015CB932600]
- Fundamental Research Funds for the Central University [20191dyXMBZ018]
- Analytical and Testing Center in Huazhong University of Science and Technology
Two-dimensional (2D) GeSe is an important IVA-VIA semiconductor for future applications in electronics and optoelectronics because of its high absorption coefficient, mobility, and photoresponsivity. However, the controllable synthesis of 2D GeSe flakes is still a huge problem. Here, high-quality single-crystalline ultrathin 2D GeSe flakes are synthesized by a salt-assisted chemical vapor deposition method. The flakes tend to grow along the [010] crystal orientation presenting a rectangular shape with a thickness down to 5 nm. Then, the electrical and optoelectronic properties have been systematically investigated. A thickness-dependent Schottky barrier is shown in GeSe field-effect transistors. The p-type conductivity of GeSe is mainly caused by the Ge deficiency, which is proven by a variable-temperature experiment and theoretical calculations. In addition, the phototransistors based on as-grown GeSe flakes present an ultrahigh responsivity of 1.8 x 10(4) A/W and an excellent external quantum efficiency of 4.2 x 10(6)%.
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