A 46μm AlGsAs/GaAs terahertz quantum-well infrared photodetector

Xi-hui Liu; Kai-sheng Liao; Xiao-hao Zhou; Zhi-feng Li; Ning Li

doi:10.1117/12.2034762

23 August 2013 A 46μm AlGsAs/GaAs terahertz quantum-well infrared photodetector

Xi-hui Liu, Kai-sheng Liao, Xiao-hao Zhou, Zhi-feng Li, Ning Li

Proceedings Volume 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications; 890912 (2013) https://doi.org/10.1117/12.2034762
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Recently infrared photodetectors have attracted much attention due to their potential use in infrared imaging, optical communications, medical detection and many other fields. In this letter, we report a THz quantum well infrared detector based on AlGaAs/GaAs material system. Structure with 4% Al content in the barrier was grown using molecular beam epitaxy (MBE). The photocurrent spectra were measured at 4.3 K with a Fourier transforming infrared spectrometer using a solid substrate far-IR beam splitter and the peak response wavelength at 46 μm was observed, close to the theoretical calculated results. The dark currents for the THz QWIP detector have been measured at different temperatures. It was found that there is a huge discontinuity in the current. We analyzed this phenomenon and believed the discontinuity in the current was caused by intersubband impact ionization of the first quantum well.

Citation Download Citation

Xi-hui Liu, Kai-sheng Liao, Xiao-hao Zhou, Zhi-feng Li, and Ning Li "A 46μm AlGsAs/GaAs terahertz quantum-well infrared photodetector", Proc. SPIE 8909, International Symposium on Photoelectronic Detection and Imaging 2013: Terahertz Technologies and Applications, 890912 (23 August 2013); https://doi.org/10.1117/12.2034762

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