Charge Transport and Space-Charge Formation in Cd1-xZnxTe1-ySey Radiation Detectors

Pipek, J.; Betušiak, M.; Belas, E.; Grill, R.; Praus, P.; Musiienko, A.; Pekarek, J.; Roy, U. N.; James, R. B.

doi:10.1103/physrevapplied.15.054058

Title: Charge Transport and Space-Charge Formation in Cd 1 - x Zn x Te 1 - y Se y Radiation Detectors

Journal Article · Wed May 26 00:00:00 EDT 2021 · Physical Review Applied

DOI:https://doi.org/10.1103/physrevapplied.15.054058· OSTI ID:1863797

^[1];

^[2]; James, R. B. ^[3]

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)
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

The electron- and hole-transport properties in cadmium zinc telluride selenide (CZTS) crystals are studied using a laser-induced transient-current technique with pulsed and dc bias. The internal electric field profile and velocity of surface recombination are determined by Monte Carlo simulations of electron and hole transient currents combined with a numerical solution of the drift-diffusion equation coupled with Poisson’s equation. Electron and hole drift mobilities of μe = 830 cm²/Vs and μh = 40 cm²/Vs, respectively, are determined. We also develop a simple technique for evaluating surface recombination directly from measured current waveforms without the need for numerical simulation. The good quality of the prepared detector at pulsed bias, with electron- and hole-mobility-lifetime products of (μτ)e = 1.9 × 10^-3 cm²/V and (μτ)h = 1.4 × 10^-4 cm²/V, respectively, are observed. The formation of a positive space charge, originating from hole injection combined with a recombination level, is found. We observe a significant position dependence of the lifetime of electrons and holes in dc bias due to hole injection. The experiment is successfully fitted by a simple model dominated by a single deep recombination level with an energy of E_t=E_C-0.73eV; concentration of 7.3 × 10¹¹ cm^-3; and electron- and hole-capture cross sections of 3.5 × 10^-14cm² and 6.5 × 10^-14cm², respectively.

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

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

Grant/Contract Number:: 89303321CEM000080

OSTI ID:: 1863797

Report Number(s):: SRNL-STI-2020-00589; 1234119; 18-12449S; TRN: US2305659

Journal Information:: Physical Review Applied, Vol. 15, Issue 5; ISSN 2331-7019

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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