期刊
IEEE TRANSACTIONS ON ELECTRON DEVICES
卷 69, 期 12, 页码 6890-6896出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3218489
关键词
High-speed photodetectors (PDs); InAs/InAsSb type-II superlattices (T2SL); mid-wavelength infrared (MWIR) photodetectors; uni-traveling carrier (UTC) photodetectors
资金
- National Key Research and Development Program of China [2019YFB2203400]
- National Natural Science Foundation of China [61975121]
- Double First-Class Initiative Fund of ShanghaiTech University
In this article, two high-speed mid-wave infrared InAs/InAsSb type-II superlattice uni-traveling carrier photodetectors (PDs) with different graded p-doping profiles in the absorber were studied. It was found that the device with higher p-doping in the absorber had a larger 3-dB bandwidth, but showed higher dark current and lower responsivity compared to the device with lower p-doping. These results are important for further development of high-speed InAs/InAsSb T2SL PDs.
In this article, we studied two high-speed mid-wave infrared InAs/InAsSb type-II superlattice (T2SL) uni-traveling carrier (UTC) photodetectors (PDs) with different graded p-doping profiles in the absorber. It is found that the UTC device with higher absorber p-doping (hereafter referred to as Device A) has a larger 3-dB bandwidth than that of the device with lower absorber p-doping (hereafter referred to as Device B). However, Device A shows a higher dark current and lower responsivity performance than Device B. The peak responsivity of Devices A and B is about 0.9 and 1.2 A/W, respectively, under-1 V at room temperature. The performance comparisons of both devices are explored in detail. These results could contribute a further step toward developing high-speed InAs/InAsSb T2SL PDs.
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