Analysis of trapping and de-trapping in CdZnTe detectors by Pockels effect

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F16%3A10328931" target="_blank" >RIV/00216208:11320/16:10328931 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1088/0022-3727/49/37/375101" target="_blank" >http://dx.doi.org/10.1088/0022-3727/49/37/375101</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/0022-3727/49/37/375101" target="_blank" >10.1088/0022-3727/49/37/375101</a>

Result language

angličtina

Original language name

Analysis of trapping and de-trapping in CdZnTe detectors by Pockels effect

Original language description

In this contribution we introduce a method of deep level spectroscopy in semi-insulating semiconductors demonstrated on detector-grade bulk CdZnTe. The method is based on the measurements of temporal and temperature evolution of the electric field profile in studied samples, which is very sensitive to a change of occupancy of deep levels. The measurement of the electric field is based on the linear electro-optic (Pockels) effect using the InGaAs avalanche photodiode with fast response. The internal electric field profile in studied samples significantly changes under various external conditions represented by the application of the bias and pulsed illumination with below-bandgap light. From the knowledge of the electric field behavior and using a standard analysis based on thermally induced transitions of electrons and holes from the deep levels to the conduction and valence bands, respectively, it is possible to get activation energies of the energy levels, their types (donor or acceptor) and corresponding capture cross-sections. By this method we have found deep levels responsible for the polarization of CdZnTe detector under high photon-fluxes. Identified deep levels E-v + 0.41 eV, E-v + 0.77 eV and E-v + 0.94 eV can capture the photo-generated holes and thus form a positive space charge, which is responsible for polarization of the detector.

Czech name

—

Czech description

—

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

—

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Physics D - Applied Physics

ISSN

0022-3727

e-ISSN

—

Volume of the periodical

49

Issue of the periodical within the volume

37

Country of publishing house

GB - UNITED KINGDOM

Number of pages

8

Pages from-to

—

UT code for WoS article

000384093000007

EID of the result in the Scopus database

2-s2.0-84989158663