Optical absorption and photoconductivity in gamma-irradiated zinc selenide crystals View Full Text


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Article Info

DATE

2010-06

AUTHORS

D. B. Él’murotova, É. M. Ibragimova

ABSTRACT

The possibility of radiation-induced enhancement of photoconductivity (σph) in crystalline zinc selenide (ZnSe) has been studied. The electron concentration in the initial ZnSe:O crystal was NEg = 1.26 × 1016 cm−3 as determined from the optical density of the sample at Eg = 2.58 eV. The irradiation of the ZnSe:O crystal by gamma-photons from 60Co source to a dose of 106 Gy leads to the creation of five new energy levels (Γ6v, 5.76 eV; L1.3v, 4.85 eV; Zni, 3.34 eV; OSe, 3.13 eV; X, 2.72 eV), a decrease in the electron concentration to NEg = 0.63 × 1016 cm−3, and a twofold increase in σph. The doping with Te to 0.2 wt % also creates the L1.3v level and increases NEg to 2.02 × 1016 cm−3 and σph to 2.01 × 10−10 Ω−1. The irradiation of Te-doped crystals leads to the creation of an additional resonant level (Zni, 3.34 eV) and a two-fold increase in σph. An increase in the content of Te to 0.5 wt % results in a shift of the Zni level to 3.39 eV and a growth in the conductivity to σph = 7.64 × 10−10 Ω−1. However, the gamma-irradiation of these crystals leads to decomposition of this center and to a decrease in the photoconductivity. More... »

PAGES

517-520

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s106378501006009x

DOI

http://dx.doi.org/10.1134/s106378501006009x

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1035295944


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