Deep-level traps induced dark currents in extended wavelength InxGa1−xAs/InP photodetector
2013; American Institute of Physics; Volume: 114; Issue: 22 Linguagem: Inglês
10.1063/1.4838041
ISSN1520-8850
AutoresXiaoli Ji, Baiqing Liu, Yue Xu, Hengjing Tang, Xue Li, Haimei Gong, Bo Shen, Xuelin Yang, Ping Han, Feng Yan,
Tópico(s)Advanced Optical Sensing Technologies
ResumoThe dark current mechanism of extended wavelength InxGa1−xAs photo-detectors is still a debated issue. In this paper, the deep-level transient spectroscopy (DLTS) and dark current characteristics of InxGa1−xAs/InP detectors are investigated. Using trap parameters obtained from DLTS measurement, the device simulations of current-voltage characteristics are carried out by Silvaco Altas. The results reveal that the dark current at the low reverse bias voltage is associated with deep level trap induced trap assisted tunneling and Shockley-Read-Hall generation mechanism. The reduction of the deep level trap concentration in InxGa1−xAs absorption layer could dramatically suppress the dark current near zero bias in extended wavelength InxGa1−xAs/InP detectors.
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