光电探测器
响应度
材料科学
纳米片
量子效率
光电子学
化学气相沉积
光电效应
半导体
外延
带隙
纳米技术
图层(电子)
作者
Luji Li,Hongda Li,Jie Li,Hao Wu,Li Yang,Wenfeng Zhang,Haixin Chang
标识
DOI:10.1021/acs.chemmater.0c03898
摘要
Development of new two-dimensional (2D) materials with high performance photoelectronic properties is critical for the future multifunctional and miniaturized optoelectronic devices. α-MnTe is an room-temperature antiferromagnetic, direct band gap p-type semiconductor with unique energy band structure and may have high photoelectric conversion efficiency and excellent photoelectric properties. However, controlled synthesis of the 2D α-MnTe single crystal has rarely been achieved so far. In this paper, 2D α-MnTe nanosheets with a NiAs-type hexagonal structure, a stable 2D nonlayered p-type semiconductor, are prepared for the first time via van der Waals epitaxy chemical vapor deposition (CVD) on mica. The thickness of 2D α-MnTe can be well tuned by the reaction temperature and gas flow. The photoelectric performance of the photodetector based on the 2D α-MnTe nanosheet shows that the 2D α-MnTe nanosheet based photodetector has an ultrahigh photoresponsivity (2599 A/W), external quantum efficiency (EQE, 8.065 × 105%), and excellent photodetectivity (3.32 × 1012 jones) at an illumination of 400 nm @ 0.062 mW/cm2 at 3 V, which is one of best performances of 2D material based photodetectors. Our work provides a new avenue to high performance 2D optoelectronic devices.
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