Xie Zhiyang, Huang Jian, Chai Xuliang, Deng Zhuo, Chen Yaojiang, Lu Qi, Xu Zhicheng, Chen Jianxin, Zhou Yi, Chen Baile
Opt Express. 2020 Nov 23;28(24):36915-36923. doi: 10.1364/OE.409868.
High-speed mid-wave infrared (MWIR) photodetectors have important applications in the emerging areas such high-precision frequency comb spectroscopy and light detection and ranging (LIDAR). In this work, we report a high-speed room-temperature mid-wave infrared interband cascade photodetector based on a type-II InAs/GaSb superlattice. The devices show an optical cut-off wavelength around 5 µm and a 3-dB bandwidth up to 7.04 GHz. The relatively low dark current density around 9.39 × 10 A/cm under -0.1 V is also demonstrated at 300 K. These results validate the advantages of ICIPs to achieve both high-frequency operation and low noise at room temperature. Limitations on the high-speed performance of the detector are also discussed based on the S-parameter analysis and other RF performance measurement.
高速中波红外（MWIR）光电探测器在诸如高精度频率梳光谱学和光探测与测距（LIDAR）等新兴领域具有重要应用。在这项工作中，我们报道了一种基于II型InAs/GaSb超晶格的高速室温中波红外带间级联光电探测器。这些器件显示出约5 µm的光学截止波长和高达7.04 GHz的3 dB带宽。在300 K时，还展示了在-0.1 V下相对较低的暗电流密度，约为9.39×10 A/cm。这些结果证实了带间级联光电探测器在室温下实现高频运行和低噪声的优势。还基于S参数分析和其他射频性能测量讨论了探测器高速性能的局限性。
