Novel grating-coupled step-bound-to-miniband transition InGaAs/GaAs/AlGaAs multiquantum well infrared photodetector

Larry S. Yu; Yanhua H. Wang; Sheng S. Li; Pin Ho

doi:10.1117/12.137800

1 September 1992 Novel grating-coupled step-bound-to-miniband transition InGaAs/GaAs/AlGaAs multiquantum well infrared photodetector

Larry S. Yu, Yanhua H. Wang, Sheng S. Li, Pin Ho

Author Affiliations +

Proceedings Volume 1685, Infrared Detectors and Focal Plane Arrays II; (1992) https://doi.org/10.1117/12.137800
Event: Aerospace Sensing, 1992, Orlando, FL, United States

Abstract

A metal grating coupled step-bound-to-miniband (SBTM) transition multiquantum well long wavelength infrared photodetector (LWIP) using a lightly strained In_0.07Ga_0.93As quantum well with a short-period Al_0.4Ga_0.6As -GaAs superlattice barrier structure has been developed. The new structure created a potential `step' in the superlattice barrier to block the undesirable electron tunneling current from the heavily doped ground state in the quantum well, which results in a significant reduction in the device dark current. The measured absorbance spectra and photocurrent are in good agreement with our theoretical predictions. The responsivity R_(lambda ) at V_b equals 6 V and T equals 77 K was found equal to 0.2, 0.15 A/W for the backside, and front normal incident illumination, respectively.

Citation Download Citation

Larry S. Yu, Yanhua H. Wang, Sheng S. Li, and Pin Ho "Novel grating-coupled step-bound-to-miniband transition InGaAs/GaAs/AlGaAs multiquantum well infrared photodetector", Proc. SPIE 1685, Infrared Detectors and Focal Plane Arrays II, (1 September 1992); https://doi.org/10.1117/12.137800

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