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 (ICIP) based on a type-II InAs/GaSb superlattice. The devices show an optical cut-off wavelength around 5um and a 3-dB bandwidth up to 7.04 GHz. The relatively low dark current density around 9.39 x 10-2 A/cm2 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.
@article{arxiv.2008.13386,
title = {High-speed InAs/GaSb Mid-Wave Infrared Interband Cascade Photodetector at Room Temperature},
author = {Zhiyang Xie and Jian Huang and Xuliang Chai and Zhuo Deng and Yaojiang Chen and Qi Lu and Zhicheng Xu and Jianxin Chen and Yi Zhou and Baile Chen},
journal= {arXiv preprint arXiv:2008.13386},
year = {2020}
}