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Title: Photon-trapping array for enhanced midwave infrared photoresponse
Authors: Suo, Fei
Tong, Jinchao
Zhang, Dao Hua
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2021
Source: Suo, F., Tong, J. & Zhang, D. H. (2021). Photon-trapping array for enhanced midwave infrared photoresponse. Journal of Physics D: Applied Physics, 54(50), 505105-.
Project: SERC A1883c0002
Journal: Journal of Physics D: Applied Physics
Abstract: Photonic structures have been attracting great attention as they have the ability to manipulate the photoresponse. Here, we report a hole array for effective photon trapping, therefore facilitating optoelectrical conversion of a midwave infrared photodetector. The integrated device consists of an InAsSb-based heterojunction photodiode and an embedded symmetric hole array penetrating through the top wide bandgap layers into the absorption region, which enables lower dark current, better broadband absorption, and improved polarization-independent photoresponse. The photoresponse enhancements of 26%–170% are achieved in the 2–5 µm range under zero power supply at temperatures from 293 K to 78 K. Combined with the effect of slightly decreasing in bulk dark current density, the zero-bias detectivity is increased by 29% at room temperature without sacrificing the response speed, where the enhanced detectivity increases to 2.09 × 109 Jones. This proposed approach provides a new strategy to boost optoelectrical conversion of photodetectors, thereby facilitating robust photodetection for widespread applications.
ISSN: 0022-3727
DOI: 10.1088/1361-6463/ac25b1
Schools: School of Electrical and Electronic Engineering 
Rights: © 2021 IOP Publishing Ltd. All rights reserved. This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics D: Applied Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at
Fulltext Permission: open
Fulltext Availability: With Fulltext
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