Bandgap engineering of Cd1-xZnxTe1-ySey(0<x<0.27,0<y<0.026)

Park, Beomjun; Kim, Yonghoon; Seo, Jiwon; Byun, Jangwon; Dedic, V.; Franc, J.; Bolotnikov, A. E.; James, Ralph B.; Kim, Kihyun

doi:10.1016/j.nima.2022.166836

Title: Bandgap engineering of Cd 1 - x Zn x Te 1 - y Se y ( 0 < x < 0 . 27 , 0 < y < 0 . 026 )

Journal Article · Fri May 13 00:00:00 EDT 2022 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2022.166836· OSTI ID:1870389

Park, Beomjun ^[1]; Kim, Yonghoon ^[1]; Seo, Jiwon ^[1]; Byun, Jangwon ^[1]; Dedic, V. ^[2]; Franc, J. ^[2]; Bolotnikov, A. E. ^[3]; James, Ralph B. ^[4]; Kim, Kihyun ^[1]

Korea Univ., Seoul, (Korea, Republic of)
Charles Univ., Prague (Czech Republic)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

CdZnTe (CZT) detectors with more than 10% zinc content did not show a remarkable improvement in the detector performance due to the additional defects introduced by the higher zinc content. However, recent research showed that the formation of defects was suppressed effectively by adding a small amount of selenium (2%) in CZT. On this basis, we attempted to enhance the detector performance through bandgap engineering by increasing the zinc content up to 25 %, while adding 2 % of selenium. Multiple CdZnTeSe (CZTS) ingots with Zn = 10, 12.5, 15, 20 and 25%, while fixing the Se composition at 2%, were grown by the Bridgman method. The bandgap of CZTS for the different Zn and Se contents was analyzed and then equations for predicting the bandgap for other alloy compositions were introduced. Furthermore, the crystallinity of CZTS was evaluated by photoluminescence measurements. The pulse height spectra for Am-241 and Co-57 sources were used to evaluate the detector performance for the CZTS samples.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation

Grant/Contract Number:: SC0012704

OSTI ID:: 1870389

Report Number(s):: BNL-223016-2022-JAAM; TRN: US2306522

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1036; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Bandgap engineering
CdZnTeSe
Pulse height spectra
Energy resolution enhancement
Defects

Title: Bandgap engineering of Cd 1 - x Zn x Te 1 - y Se y ( 0 < x < 0 . 27 , 0 < y < 0 . 026 )

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