响应度
光电二极管
光探测
光电子学
材料科学
砷化铟镓
异质结
光电探测器
暗电流
雪崩光电二极管
波长
锑
二极管
光学
红外线的
锑化镓
探测器
砷化镓
物理
超晶格
作者
Andreas Woerl,Raphael Mueller,V. Daumer,Jasmin Niemasz,Frank Rutz,Robert Rehm
摘要
The detection in short wavelength infrared (SWIR) band, ranging from 1–3 μm, provides a wide range of applications in earth observation, plastics recycling, biology and hyperspectral imaging, gas analysis and defense. In this paper, uncooled InGaAsSb-based detectors for the wavelength range beyond 1.7 μm, the extended SWIR (eSWIR), are investigated for the later use in a thermographic traffic monitoring system that is supposed to localize potentially dangerous overheated hot-spot regions. Up to the wavelength of 1.7 μm, InGaAs lattice-matched with InP is used for photodetection in the SWIR. To reach a longer cutoff wavelength, “extended InGaAs” can be employed. This requires strained growth that leads to more growth defects and reduced yield, though. InGaAsSb, however, provides a tunable bandgap for detection beyond 1.7 μm and still enables lattice-matched growth on GaSb, which makes it a viable alternative for photodetection in the eSWIR. We have demonstrated that the bandgap of InGaAsSb can be tuned in the eSWIR by modifying the stoichiometry for lattice-matched growth on GaSb. Furthermore, we have successfully realized InGaAsSb heterojunction photodiodes with an AlGaAsSb hole barrier. At room temperature, the diodes achieve a dark current density of 0.5 mA/cm2 and a responsivity better than 1 A/W resulting in an excellent peak detectivity of 9 x 1010 cm Hz1/2/W. Thus, the highperformance detector arrays operating at room temperature are within reach in order to meet application demands.
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