InSb photodiodes for monolithic active focal plane arrays on GaAs substrates

Pusino, V. , Xie, C., Khalid, A. , Steer, M. J., Sorel, M., Thayne, I. G. and Cumming, D. R.S. (2016) InSb photodiodes for monolithic active focal plane arrays on GaAs substrates. IEEE Transactions on Electron Devices, 63(8), pp. 3135-3142. (doi:10.1109/TED.2016.2578982)

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Abstract

We describe the development and optical characterization of a planar medium infrared (mid-IR) InSb photodetector on a GaAs substrate technology, capable of integrating MESFETs, to demonstrate a new active pixel device architecture. Our results pave the way for the development of integrated mid-IR focal plane array circuits on a single chip. Device structures with areas down to 0.0016 mm2 were investigated. By deploying a silicon nitride passivation layer, we were able to reduce leakage current in reverse bias by up to 27% to yield an improved rectifier. Extensive optical characterization was carried out in the near- and mid-IR wavelength range. Responsivities of up to 3.54 A/W and quantum efficiency values above unity were obtained in the near-IR range as a consequence of illumination above the bandgap causing impact ionization. In the mid-IR range, responsivities of up to 0.97 A/W were observed. The bandwidth of the devices proved compatible with video-rate standard sampling rates.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Thayne, Professor Iain and Cumming, Professor David and Sorel, Professor Marc and Pusino, Mr Vincenzo and Khalid, Dr Ata-ul-Habib and Steer, Dr Matthew
Authors: Pusino, V., Xie, C., Khalid, A., Steer, M. J., Sorel, M., Thayne, I. G., and Cumming, D. R.S.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Transactions on Electron Devices
Publisher:Institute of Electrical and Electronics Engineers
ISSN:0018-9383
ISSN (Online):1557-9646
Published Online:21 June 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in IEEE Transactions on Electron Devices 63(8):3135-3142
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
588331Triple wavelength superspectral camera focal-plane array (SUPERCAMERA)David CummingEngineering & Physical Sciences Research Council (EPSRC)EP/J018678/1ENG - ENGINEERING ELECTRONICS & NANO ENG
588332Triple wavelength superspectral camera focal-plane array (SUPERCAMERA)David CummingEngineering & Physical Sciences Research Council (EPSRC)EP/J018678/1ENG - ENGINEERING ELECTRONICS & NANO ENG
6672319UK Quantum Technology Hub in Enhanced Quantum ImagingMiles PadgettEngineering & Physical Sciences Research Council (EPSRC)EP/M01326X/1S&E P&A - PHYSICS & ASTRONOMY