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首页> 外文期刊>ACS applied materials & interfaces >Highly Sensitive, Fast Graphene Photodetector with Responsivity > 10(6) A/W Using a Floating Quantum Well Gate
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Highly Sensitive, Fast Graphene Photodetector with Responsivity > 10(6) A/W Using a Floating Quantum Well Gate

机译：高度敏感，快速石墨烯光电探测器，响应性> 10（6）A / W使用浮动量子阱门

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摘要

Graphene, owing to its zero-band-gap electronic structure, is promising as an absorption material for ultrawideband photodetection applications. However, graphene-absorption-based detectors inherently suffer from poor responsivity because of weak absorption and fast photocarrier recombination, limiting their viability for low-intensity light detection. Here, we use a graphene/WS2/MoS2 vertical heterojunction to demonstrate a highly sensitive photodetector, where the graphene layer serves dual purposes, namely, as the light absorption layer and also as the carrier conduction channel, thus maintaining the broadband nature of the photodetector. A fraction of the photoelectrons in graphene encounter ultrafast interlayer transfer to a floating monolayer MoS2 quantum well, providing a strong quantum-confined photogating effect. The photodetector shows a responsivity of 4.4 X 10(6) A/W at 30 1W incident power, outperforming photodetectors reported till date where graphene is used as a light absorption material by several orders. In addition, the proposed photodetector exhibits an extremely low noise equivalent power of <4 fW/root Hz. and a fast response (similar to milliseconds) with zero reminiscent photocurrent. The findings are attractive toward the demonstration of a graphene-based highly sensitive, fast, broadband photodetection technology.
机译：由于其零带 - 间隙电子结构，石墨烯是有前途的超视带光电检测应用的吸收材料。然而，由于弱吸收和快速光载体重组，石墨烯吸收的探测器本身具有较差的反应性，限制了它们对低强度光检测的可行性。在这里，我们使用石墨烯/ WS2 / MOS2垂直异质结来演示高敏感的光电探测器，其中石墨烯层用于双目的，即作为光吸收层，也可以作为载体传导通道，从而保持光电探测器的宽带性质。石墨烯中的光电子的一小部分遇到超速层间​​转移到浮动单层MOS2量子阱，提供了强量子限制的光光效果。光电探测器显示在30 1W入射功率的4.4×10（6）A / W的响应度，显着的光电探测器到日期，其中Graphere用几种订单用作光吸收材料。另外，所提出的光电探测器表现出极低的噪声等效功率<4 fW /根Hz。和快速响应（类似于毫秒），具有零调情光电流。该研究结果对展示基于石墨烯的高敏感，快速，宽带光电探测技术具有吸引力。

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