Effects of the impurity-host interactions on the nonradiative processes in ZnS:Cr

Tablero Crespo, César (2010). Effects of the impurity-host interactions on the nonradiative processes in ZnS:Cr. "Journal of Applied Physics", v. 108 (n. 093114); pp. 108-1. ISSN 0021-8979. https://doi.org/10.1063/1.3506705.

Description

Title: Effects of the impurity-host interactions on the nonradiative processes in ZnS:Cr
Author/s:
  • Tablero Crespo, César
Item Type: Article
Título de Revista/Publicación: Journal of Applied Physics
Date: January 2010
ISSN: 0021-8979
Volume: 108
Subjects:
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Electrónica Física
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

There is a great deal of controversy about whether the behavior of an intermediate band in the gap of semiconductors is similar or not to the deep-gap levels. It can have significant consequences, for example, on the nonradiative recombination. In order to analyze the behavior of an intermediate band, we have considered the effect of the inward and outward displacements corresponding to breathing and longitudinal modes of Cr-doped ZnS and on the charge density for different processes involved in the nonradiative recombination using first-principles. This metal-doped zinc chalcogenide has a partially filled band within the host semiconductor gap. In contrast to the properties exhibited by deep-gap levels in other systems, we find small variations in the equilibrium configurations, forces, and electronic density around the Cr when the nonradiative recombination mechanisms modify the intermediate band charge. The charge density around the impurity is equilibrated in response to the perturbations in the equilibrium nuclear configuration and the charge of the intermediate band. The equilibration follows a Le Chatelier principle through the modification of the contribution from the impurity to the intermediate band and to the valence band. The intermediate band introduced by Cr in ZnS for the concentrations analyzed makes the electronic capture difficult and later multiphonon emission in the charge-transfer processes, in accordance with experimental results.

Funding Projects

TypeCodeAcronymLeaderTitle
FP7211640IBPOWERUnspecifiedIntermediate Band Materials and Solar Cells for Photovoltaics with High Efficiency and Reduced Cost

More information

Item ID: 8351
DC Identifier: http://oa.upm.es/8351/
OAI Identifier: oai:oa.upm.es:8351
DOI: 10.1063/1.3506705
Official URL: http://jap.aip.org/resource/1/japiau/v108/i9/p093114_s1?isAuthorized=no
Deposited by: Memoria Investigacion
Deposited on: 19 Jul 2011 11:58
Last Modified: 04 Nov 2014 11:28
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