Two-dimensional (2D) semiconductors have been extensively explored as a new class of materials with great potential. In particular, black phosphorus (BP) has been considered to be a strong candidate for applications such as high-performance infrared photodetectors. However, the scalability of BP thin film is still a challenge, and its poor stability in the air has hampered the progress of the commercialization of BP devices. Herein, we report the use of hydrothermal-synthesized and air-stable 2D tellurene nanoflakes for broadband and ultrasensitive photodetection. The tellurene nanoflakes show high hole mobilities up to 458 cm2/V·s at ambient conditions, and the tellurene photodetector presents peak extrinsic responsivity of 383 A/W, 19.2 mA/W, and 18.9 mA/W at 520 nm, 1.55 μm, and 3.39 μm light wavelength, respectively. Because of the photogating effect, high gains up to 1.9 × 103 and 3.15 × 104 are obtained at 520 nm and 3.39 μm wavelength, respectively. At the communication wavelength of 1.55 μm, the tellurene photodetector exhibits an exceptionally high anisotropic behavior, and a large bandwidth of 37 MHz is obtained. The photodetection performance at different wavelength is further supported by the corresponding quantum molecular dynamics (QMD) simulations. Our approach has demonstrated the air-stable tellurene photodetectors that fully cover the short-wave infrared band with ultrafast photoresponse.

中文翻译：

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具有高增益和宽带宽的Tellurene光电探测器。

二维（2D）半导体已被广泛探索为具有巨大潜力的新型材料。特别是，黑磷（BP）被认为是高性能红外光电探测器等应用的强力候选者。但是，BP薄膜的可扩展性仍然是一个挑战，其在空气中的较差稳定性阻碍了BP装置商业化的进程。本文中，我们报告了水热合成和空气稳定的2D碲碳纳米薄片在宽带和超灵敏光电检测中的应用。碲化物纳米薄片在环境条件下显示出高达458 cm2 / V·s的高空穴迁移率，并且碲化物光电探测器在520 nm，1.55μm处呈现383 A / W，19.2 mA / W和18.9 mA / W的峰值非本征响应度，和3.39μm的光波长。由于具有光闸效应，在520 nm和3.39μm波长处分别可获得高达1.9×103和3.15×104的高增益。在1.55μm的通信波长下，碲铝光电探测器表现出异常高的各向异性，并获得了37 MHz的大带宽。相应的量子分子动力学（QMD）模拟进一步支持了不同波长下的光电检测性能。我们的方法已经证明了具有超快光响应的完全稳定的短波红外波段的空气稳定型碲氢光电探测器。并获得37 MHz的大带宽。相应的量子分子动力学（QMD）模拟进一步支持了不同波长下的光电检测性能。我们的方法已经证明了具有超快光响应的完全稳定的短波红外波段的空气稳定型碲氢光电探测器。并获得37 MHz的大带宽。相应的量子分子动力学（QMD）模拟进一步支持了不同波长下的光电检测性能。我们的方法已经证明了具有超快光响应的完全稳定的短波红外波段的空气稳定型碲氢光电探测器。