Ultrafast photocurrent measurements of a black phosphorus photodetector
Ultrafast photocurrent measurements of a black phosphorus photodetector
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DOI：
10.1063/1.4975360
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发表时间：
2017-01-30
影响因子：
4
通讯作者：
Li, Mo
中科院分区：
文献类型：
--
作者：
Youngblood, Nathan;Li, Mo
黑磷（BP）具有高迁移率、窄禁带和独特的各向异性，是一种很有前途的光电应用材料。波导集成的光电探测器与RC限制的速度高达3GHz最近已被证明在电信波长。然而，为了真正具有竞争力，BP光电探测器必须达到数十GHz的速度。在这里，我们使用BP的非线性光响应测量的BP光电探测器使用超快泵浦探测测量的固有速度。通过这种技术，我们能够观察到检测速度如何依赖于入射功率和施加的源漏偏置。观察到60 ps的最小响应时间，其对应于9GHz的固有带宽。由AIP出版社出版。
With its high mobility, narrow bandgap, and unique anisotropy, black phosphorus (BP) is a promising material for optoelectronic applications. Waveguide-integrated photodetectors with RC-limited speeds up to 3GHz have been recently demonstrated at telecom wavelengths. To truly be competitive, however, BP photodetectors must reach speeds of tens of GHz. Here, we use BP's nonlinear photoresponse to measure the intrinsic speed of a BP photodetector using ultrafast pump-probe measurements. With this technique, we are able to observe how the detection speed depends on both the incident power and applied source-drain bias. A minimum response time of 60 ps was observed which corresponds to an intrinsic bandwidth of 9GHz. Published by AIP Publishing.