The Dependencies of X-Ray Conductivity and X-Ray Luminescence of ZnSe Crystals on the Excitation Intensity

V Ya Degoda,N O Kovalenko,N Yu Pavlova,M Alizadeh

doi:10.1155/2018/1515978

Abstract

This work studies the conductivity and luminescence of ZnSe single crystals under X-ray irradiation. The experimentally derived lux-ampere characteristics of the X-ray conductivity for ZnSe crystals have a sublinear behavior within the temperature range from 8 to 420 K. The theoretical analysis of the conductivity kinetics at X-ray excitation showed that the value of maximum accumulated lightsum at deep traps does not depend on radiation intensity. However, regarding shallow and phosphorescent traps, the strength of accumulated lightsum depends on the intensity of exciting irradiation. Specifically, these shallow traps and phosphorescent traps cause the sublinear behavior of lux-ampere characteristics in the semiconductor material.

Highlights

Zinc Selenide (ZnSe) [1,2,3,4,5,6,7] is a topic to be investigated
We studied the conductivity and luminescence of ZnSe single crystals under the excitation by X-ray quanta
The obtained distinctive spectra of X-ray luminescence (XRL) for the samples of ZnSe single crystals in the wavelength range from 400 to 1200 nm at various temperatures and excitation intensity levels are presented in Figures 1, 2, and 3

Summary

Introduction

Zinc Selenide (ZnSe) [1,2,3,4,5,6,7] is a topic to be investigated. This material was well studied and well researched among the most promising wide-bandgap semiconductors (WBG or WBGS) of the II-VI semiconductor group (AIIBVI or A2B6). The single crystals have a rather large effective atomic number (Zeff = 32) and a large band gap width (2.7 eV at 300 K), which makes them a promising material to create X-ray detectors, which do not require cooling and can operate at high temperatures (up to 450 K) [17]. These findings make the studies of X-ray conductivity (XRC) and X-ray luminescence (XRL) in ZnSe single crystals topical. The work aimed to experimentally investigate the spectra of luminescence and conductivity and their dependencies on the intensity of X-ray excitation for the ZnSe single crystals at various temperatures and explain the sublinear dependencies of the LAC of the X-ray conductivity and LLC of the X-ray luminescence

Experimental Details

The Results of the Experiments

Analysis of the Experimental Results

Conclusions