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CdZnTe Radiation Detectors with HgTe/HgCdTe Superlattice Contacts for Leakage Current Reduction

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Title: CdZnTe Radiation Detectors with HgTe/HgCdTe Superlattice Contacts for Leakage Current Reduction
Author(s): Chang, Y.; Grein, C.H.; Becker, C.R.; Wang, X.J.; Duan, Q.; Ghosh, S.; Dreiske, P.; Bommena, R.; Zhao, J.; Carmody, M.; Aqariden, F.; Sivananthan, S.
Subject(s): superlattice cadmium zinc telluride radiation detector leakage current
Abstract: CdZnTe-based heterojunctionp-i-n or M-π-n detectors using HgTe/CdTe superlattice contacts are modeled and designed to reduce leakage currents under high electric fields and thereby improve X-ray and γ-ray detector performance. The employment of an n-type HgTe/CdTe superlattice as a contact layer can theoretically result in significantly less leakage current compared to a contact layer using either bulk semiconductors or metal contacts. The benefits arise from the ability to design HgTe/CdTesuperlattices to have large carrier effective masses in the electric field direction, which results in low carrier velocities. Nevertheless the density of states is lower than that of a comparable bulk semiconductor, which results in low carrier concentrations.
Issue Date: 2011-08
Publisher: Institute of Electrical and Electronics Engineers
Citation Info: Chang, Y., Grein, C. H., Becker, C. R., Wang, X. J., Duan, Q., Ghosh, S., Dreiske, P., Bommena, R., Zhao, J., Carmody, M., Aqariden, F., & Sivananthan, S. CdZnTe Radiation Detectors with HgTe/HgCdTe Superlattice Contacts for Leakage Current Reduction. Journal of Electronic Materials . 2011. DOI: 10.1007/s11664-011-1680-3
Type: Article
Description: © 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. DOI: 10.1007/s11664-011-1680-3
URI: http://hdl.handle.net/10027/8235
ISSN: 0361-5235
Sponsor: This work was supported by Department of Energy, NNSA Service Center, Office of Nonproliferation Research and Development (NA-22) Proliferation Detection Program under grant number DE-FG52-08NA28765.
Date Available in INDIGO: 2012-03-21
 

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