Strained p-type InGaAs/AlGaAs multiple quantum well infrared photodetectors

Dao Hua Zhang; Lu Sun; Wei Shi; Soon Fatt Yoon; Ning Li; Z. Yuan; Junhao Chu

doi:10.1117/12.465825

20 September 2002 Strained p-type InGaAs/AlGaAs multiple quantum well infrared photodetectors

Dao Hua Zhang, Lu Sun, Wei Shi, Soon Fatt Yoon, Ning Li, Z. Yuan, Junhao Chu

Proceedings Volume 4919, Advanced Materials and Devices for Sensing and Imaging; (2002) https://doi.org/10.1117/12.465825
Event: Photonics Asia, 2002, Shanghai, China

Abstract

Strained p-type In_0.15Ga_0.85As/Al_0.33Ga_0.67As quantum well infrared photodetectors (QWIPs) with different Be concentrations in their wells, which detect normal infrared incidence, were investigated. The QWIPs with a Be doping density of 10¹⁸ cm^-3 in the wells show a cut-off wavelength of 7.9 μm and basically symmetric detectives of about 8 x 10⁸ cm.Hz^½/W at 600 Hz. By increasing the Be doping density in the wells to 2 x 10¹⁹ cm^-3, the cut-off wavelength is blue-shifted to about 7.25 meV and the photoresponsivity and detectivity become asymmetric. The detectivity is increased to about 1.4 x 10⁹ cm.Hz^½/W at positive biases but significantly reduced at negative biases. The blue shift in the cut-off wavelength for the QWIP devices with heavy doping concentration in the wells is mainly due to the bandgap shrinkage and the increased well width while the asymmetric behavior in the photoresponsivity and detectivity is likely due to the inhomogenity resulting from dopant diffusion at high doping.

Citation Download Citation

Dao Hua Zhang, Lu Sun, Wei Shi, Soon Fatt Yoon, Ning Li, Z. Yuan, and Junhao Chu "Strained p-type InGaAs/AlGaAs multiple quantum well infrared photodetectors", Proc. SPIE 4919, Advanced Materials and Devices for Sensing and Imaging, (20 September 2002); https://doi.org/10.1117/12.465825

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