Ellipsometric study of the optical response of ZnS:Cr for PV applications

Thomas Brakstad; Benjamin R. Hope; Mohammadreza Nematollahi; Morten Kildemo; Nikolas J. Podraza; Kiran Ghimire; Turid W. Reenaas

doi:10.1016/j.apsusc.2016.10.157

Ellipsometric study of the optical response of ZnS:Cr for PV applications

Thomas Brakstad, Benjamin R. Hope, Mohammadreza Nematollahi, Morten Kildemo, Nikolas J. Podraza, Kiran Ghimire, Turid W. Reenaas

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

2 Citations (Scopus)

Abstract

Optical properties of highly chromium doped (2–4 at.%) zinc sulfide made by pulsed laser deposition have been studied by spectroscopic ellipsometry in the spectral range of 0.73–5.90 eV. The characteristic optical features of the ZnS are a direct bandgap with absorption onset at 3.6 eV, with E0, E1 and E2 critical points around 3.7, 5.7 and 7 eV. Excitonic effects were observed to be strong in this material – in line with the literature. The sub-bandgap absorption accredited to the chromium doping appears as a broad sub-bandgap feature increasing monotonously with increased doping concentration at a given growth temperature. In this report, we discuss three different approaches to extract and analyze the optical properties in terms of the complex dielectric function.

Original language	English
Pages (from-to)	315-319
Journal	Applied surface science
Volume	421
Issue number	Part B
DOIs	https://doi.org/10.1016/j.apsusc.2016.10.157
Publication status	Published - 1 Nov 2017

Keywords

Cr doped ZnS
dielectric function
Ellipsometry
ZnS

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title = "Ellipsometric study of the optical response of ZnS:Cr for PV applications",

abstract = "Optical properties of highly chromium doped (2–4 at.%) zinc sulfide made by pulsed laser deposition have been studied by spectroscopic ellipsometry in the spectral range of 0.73–5.90 eV. The characteristic optical features of the ZnS are a direct bandgap with absorption onset at 3.6 eV, with E0, E1 and E2 critical points around 3.7, 5.7 and 7 eV. Excitonic effects were observed to be strong in this material – in line with the literature. The sub-bandgap absorption accredited to the chromium doping appears as a broad sub-bandgap feature increasing monotonously with increased doping concentration at a given growth temperature. In this report, we discuss three different approaches to extract and analyze the optical properties in terms of the complex dielectric function.",

keywords = "Cr doped ZnS, dielectric function, Ellipsometry, ZnS",

author = "Thomas Brakstad and Hope, {Benjamin R.} and Mohammadreza Nematollahi and Morten Kildemo and Podraza, {Nikolas J.} and Kiran Ghimire and Reenaas, {Turid W.}",

year = "2017",

month = nov,

day = "1",

doi = "10.1016/j.apsusc.2016.10.157",

language = "English",

volume = "421",

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journal = "Applied surface science",

issn = "0169-4332",

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TY - JOUR

T1 - Ellipsometric study of the optical response of ZnS:Cr for PV applications

AU - Brakstad, Thomas

AU - Hope, Benjamin R.

AU - Nematollahi, Mohammadreza

AU - Kildemo, Morten

AU - Podraza, Nikolas J.

AU - Ghimire, Kiran

AU - Reenaas, Turid W.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - Optical properties of highly chromium doped (2–4 at.%) zinc sulfide made by pulsed laser deposition have been studied by spectroscopic ellipsometry in the spectral range of 0.73–5.90 eV. The characteristic optical features of the ZnS are a direct bandgap with absorption onset at 3.6 eV, with E0, E1 and E2 critical points around 3.7, 5.7 and 7 eV. Excitonic effects were observed to be strong in this material – in line with the literature. The sub-bandgap absorption accredited to the chromium doping appears as a broad sub-bandgap feature increasing monotonously with increased doping concentration at a given growth temperature. In this report, we discuss three different approaches to extract and analyze the optical properties in terms of the complex dielectric function.

AB - Optical properties of highly chromium doped (2–4 at.%) zinc sulfide made by pulsed laser deposition have been studied by spectroscopic ellipsometry in the spectral range of 0.73–5.90 eV. The characteristic optical features of the ZnS are a direct bandgap with absorption onset at 3.6 eV, with E0, E1 and E2 critical points around 3.7, 5.7 and 7 eV. Excitonic effects were observed to be strong in this material – in line with the literature. The sub-bandgap absorption accredited to the chromium doping appears as a broad sub-bandgap feature increasing monotonously with increased doping concentration at a given growth temperature. In this report, we discuss three different approaches to extract and analyze the optical properties in terms of the complex dielectric function.

KW - Cr doped ZnS

KW - dielectric function

KW - Ellipsometry

KW - ZnS

U2 - 10.1016/j.apsusc.2016.10.157

DO - 10.1016/j.apsusc.2016.10.157

M3 - Article

VL - 421

SP - 315

EP - 319

JO - Applied surface science

JF - Applied surface science

SN - 0169-4332

IS - Part B

ER -