Defect-induced increase in the phonon energy involved in the formation of Urbach tail in Cu-ternaries

S. M. Wasim; I. Bonalde; E. Medina; G. Marín; C. Rincón

doi:10.1016/j.jpcs.2005.02.012

Defect-induced increase in the phonon energy involved in the formation of Urbach tail in Cu-ternaries

S. M. Wasim^*
, I. Bonalde
, E. Medina
, G. Marín
, C. Rincón

^*Corresponding author for this work

Universidad de los Andes Mérida
Instituto Venezolano de Investigaciones Científicas

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

From a combined analysis of the stoichiometric composition and Urbach tail in samples of CuInSe₂, CuInTe₂, and CuGaTe₂ of the I-III-VI₂ family of chalcopyrite semiconductors, it is found that the energy hν_p involved in the electron/exciton-phonon interaction is a linear function of a parameter Δz which is the sum of the deviations from ideal molecularity Δx and anion to cation ratio Δy. It gives evidence that in the copper ternaries hν_p is associated to the structural defects caused by cation-cation, cation-anion, and other intrinsic disorders. The high value of hν_p found in the studied samples, higher than the highest optical mode, is shown to come from the contribution of the additional phonon energy due to structural defects. This is in agreement with recently proposed models of the temperature dependence of the Urbach energy.

Original language	English
Pages (from-to)	1187-1191
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	66
Issue number	7
DOIs	https://doi.org/10.1016/j.jpcs.2005.02.012
State	Published - Jul 2005
Externally published	Yes

Keywords

A. Electronic materials
A. Semiconductors
D. Defects
D. Lattice dynamics
D. Optical properties

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10.1016/j.jpcs.2005.02.012

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@article{7ccd76e2428642719e004463eb49b20c,

title = "Defect-induced increase in the phonon energy involved in the formation of Urbach tail in Cu-ternaries",

abstract = "From a combined analysis of the stoichiometric composition and Urbach tail in samples of CuInSe2, CuInTe2, and CuGaTe2 of the I-III-VI2 family of chalcopyrite semiconductors, it is found that the energy hνp involved in the electron/exciton-phonon interaction is a linear function of a parameter Δz which is the sum of the deviations from ideal molecularity Δx and anion to cation ratio Δy. It gives evidence that in the copper ternaries hνp is associated to the structural defects caused by cation-cation, cation-anion, and other intrinsic disorders. The high value of hνp found in the studied samples, higher than the highest optical mode, is shown to come from the contribution of the additional phonon energy due to structural defects. This is in agreement with recently proposed models of the temperature dependence of the Urbach energy.",

keywords = "A. Electronic materials, A. Semiconductors, D. Defects, D. Lattice dynamics, D. Optical properties",

author = "Wasim, \{S. M.\} and I. Bonalde and E. Medina and G. Mar{\'i}n and C. Rinc{\'o}n",

note = "Funding Information: This work was supported by grants from FONACIT (Contract G-97000670) and CDCHT-ULA (Contracts Nos. C-917 and C-918).",

year = "2005",

month = jul,

doi = "10.1016/j.jpcs.2005.02.012",

language = "Ingl{\'e}s",

volume = "66",

pages = "1187--1191",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Ltd",

number = "7",

}

TY - JOUR

T1 - Defect-induced increase in the phonon energy involved in the formation of Urbach tail in Cu-ternaries

AU - Wasim, S. M.

AU - Bonalde, I.

AU - Medina, E.

AU - Marín, G.

AU - Rincón, C.

N1 - Funding Information: This work was supported by grants from FONACIT (Contract G-97000670) and CDCHT-ULA (Contracts Nos. C-917 and C-918).

PY - 2005/7

Y1 - 2005/7

N2 - From a combined analysis of the stoichiometric composition and Urbach tail in samples of CuInSe2, CuInTe2, and CuGaTe2 of the I-III-VI2 family of chalcopyrite semiconductors, it is found that the energy hνp involved in the electron/exciton-phonon interaction is a linear function of a parameter Δz which is the sum of the deviations from ideal molecularity Δx and anion to cation ratio Δy. It gives evidence that in the copper ternaries hνp is associated to the structural defects caused by cation-cation, cation-anion, and other intrinsic disorders. The high value of hνp found in the studied samples, higher than the highest optical mode, is shown to come from the contribution of the additional phonon energy due to structural defects. This is in agreement with recently proposed models of the temperature dependence of the Urbach energy.

AB - From a combined analysis of the stoichiometric composition and Urbach tail in samples of CuInSe2, CuInTe2, and CuGaTe2 of the I-III-VI2 family of chalcopyrite semiconductors, it is found that the energy hνp involved in the electron/exciton-phonon interaction is a linear function of a parameter Δz which is the sum of the deviations from ideal molecularity Δx and anion to cation ratio Δy. It gives evidence that in the copper ternaries hνp is associated to the structural defects caused by cation-cation, cation-anion, and other intrinsic disorders. The high value of hνp found in the studied samples, higher than the highest optical mode, is shown to come from the contribution of the additional phonon energy due to structural defects. This is in agreement with recently proposed models of the temperature dependence of the Urbach energy.

KW - A. Electronic materials

KW - A. Semiconductors

KW - D. Defects

KW - D. Lattice dynamics

KW - D. Optical properties

UR - https://www.scopus.com/pages/publications/23844514409

U2 - 10.1016/j.jpcs.2005.02.012

DO - 10.1016/j.jpcs.2005.02.012

M3 - Artículo

AN - SCOPUS:23844514409

SN - 0022-3697

VL - 66

SP - 1187

EP - 1191

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 7

ER -

Defect-induced increase in the phonon energy involved in the formation of Urbach tail in Cu-ternaries

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Keywords

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