Assessment of deep levels with selenium concentration in Cd1–xZnxTe1–ySey room temperature detector materials

Kleppinger, Joshua W.; Chaudhuri, Sandeep K.; Nag, Ritwik; Roy, Utpal N.; James, Ralph B.; Mandal, Krishna C.

doi:10.1063/5.0159519

Assessment of deep levels with selenium concentration in Cd_1–xZn_xTe_1–ySe_y room temperature detector materials

Journal Article · Wed Aug 09 00:00:00 EDT 2023 · Applied Physics Letters

DOI:https://doi.org/10.1063/5.0159519· OSTI ID:1997254

^[1]; ^[2]; Nag, Ritwik ^[2]; ^[1]; ^[1]; ^[2]

Savannah River National Laboratory (SRNL), Aiken, SC (United States)
University of South Carolina, Columbia, SC (United States)

Incorporation of Se into Cd_1–xZn_xTe (CZT) to form the quaternary compound semiconductor Cd_1–xZn_xTe_1–ySe_y (CZTS) has proven to be an effective solution for compensating the major flaws associated with CZT, including poor homogeneity and high concentrations of electronically active deep levels that limit the performance of CZT detectors. In order to investigate how deep levels are affected by the Se concentration in CZTS, we performed photoinduced current transient spectroscopy (PICTS) measurements on CZTS crystals grown by the traveling heater method (THM) with 10% atomic Zn and varying atomic percentage of Se from 1.5% to 7.0%. The PICTS scans for up to 4% Se showed an exponential reduction in the capture cross section of deep levels associated with Te secondary phases in conjunction with an increase in a deep level positioned near the mid-gap, which initially increases the electron trapping time before degrading again at higher Se concentrations. The PICTS peaks present in 7% Se were anomalous relative to the other crystals and are expected to originate from transition metal impurities found in the lower-purity CdSe precursor material.

View Accepted Manuscript (DOE)

Research Organization:: Savannah River National Laboratory (SRNL), Aiken, SC (United States); Savannah River Site (SRS), Aiken, SC (United States)

Sponsoring Organization:: USDOE Office of Environmental Management (EM)

Grant/Contract Number:: 89303321CEM000080

OSTI ID:: 1997254

Report Number(s):: SRNL-STI-2023-00235

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 6 Vol. 123; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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