Optical properties of lead-free NKN films from transmission and spectral ellipsometry

R. Schwarz; L. Santos; R. Ayouchi; S. R. Bhattacharyya; U. Mardolcar; M. Leal; A. Kholkin

doi:10.1080/00150193.2013.821018

Optical properties of lead-free NKN films from transmission and spectral ellipsometry

R. Schwarz^*
, L. Santos
, R. Ayouchi
, S. R. Bhattacharyya
, U. Mardolcar
, M. Leal
, A. Kholkin

^*Šī darba korespondējošais autors

University of Lisbon
University of Aveiro

Zinātniskās darbības rezultāts: Devums žurnālam › Konferences zinātniskais raksts › koleģiāli recenzēts

1 Atsauce (Scopus)

Kopsavilkums

Thin films of lead-free Na_xK_1-xNbO₃ (NKN) were prepared by pulsed laser deposition (PLD) from ceramic targets of stoichiometric NKN or doped with 6% of lithium niobate (LN). At a deposition temperature of 600°C a strong dependence of film morphology on laser fluence is revealed by SEM microscopy. Optical properties like band gap and index of refraction were obtained through transmission measurements and analysis based on the Tauc model. The results were compared to spectral ellipsometry using a fit to the Tauc-Lorentz model, and slightly smaller band gap values were obtained. C-V characteristics of sandwich structures yielded high permittivity of 380 in pure NKN films and tunability at 1 kHz of 3.2% at 1.5 MV/m applied electric field.

Oriģinālvaloda	Angļu
Lapas (no-līdz)	118-127
Lapu skaits	10
Žurnāls	Ferroelectrics
Sējums	446
Izdevuma numurs	1
DOIs	https://doi.org/10.1080/00150193.2013.821018
Publikācijas statuss	Publicēts - 2013
Ārēji publicēts	Jā
Pasākums	11th European Conference on Applications of Polar Dielectrics, ECAPD 2012 - Aveiro, Portugāle Ilgums: 9 jūl. 2012 → 13 jūl. 2012

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@article{ed2bb3a2e3b2470d88cba10982579d8d,

title = "Optical properties of lead-free NKN films from transmission and spectral ellipsometry",

abstract = "Thin films of lead-free NaxK1-xNbO3 (NKN) were prepared by pulsed laser deposition (PLD) from ceramic targets of stoichiometric NKN or doped with 6\% of lithium niobate (LN). At a deposition temperature of 600°C a strong dependence of film morphology on laser fluence is revealed by SEM microscopy. Optical properties like band gap and index of refraction were obtained through transmission measurements and analysis based on the Tauc model. The results were compared to spectral ellipsometry using a fit to the Tauc-Lorentz model, and slightly smaller band gap values were obtained. C-V characteristics of sandwich structures yielded high permittivity of 380 in pure NKN films and tunability at 1 kHz of 3.2\% at 1.5 MV/m applied electric field.",

keywords = "Band gap, NKN, Optical transmission, PLD, Spectral ellipsometry, Thin film",

author = "R. Schwarz and L. Santos and R. Ayouchi and Bhattacharyya, \{S. R.\} and U. Mardolcar and M. Leal and A. Kholkin",

year = "2013",

doi = "10.1080/00150193.2013.821018",

language = "English",

volume = "446",

pages = "118--127",

journal = "Ferroelectrics",

issn = "0015-0193",

publisher = "Taylor and Francis Ltd.",

number = "1",

note = "11th European Conference on Applications of Polar Dielectrics, ECAPD 2012 ; Conference date: 09-07-2012 Through 13-07-2012",

}

TY - JOUR

T1 - Optical properties of lead-free NKN films from transmission and spectral ellipsometry

AU - Schwarz, R.

AU - Santos, L.

AU - Ayouchi, R.

AU - Bhattacharyya, S. R.

AU - Mardolcar, U.

AU - Leal, M.

AU - Kholkin, A.

PY - 2013

Y1 - 2013

N2 - Thin films of lead-free NaxK1-xNbO3 (NKN) were prepared by pulsed laser deposition (PLD) from ceramic targets of stoichiometric NKN or doped with 6% of lithium niobate (LN). At a deposition temperature of 600°C a strong dependence of film morphology on laser fluence is revealed by SEM microscopy. Optical properties like band gap and index of refraction were obtained through transmission measurements and analysis based on the Tauc model. The results were compared to spectral ellipsometry using a fit to the Tauc-Lorentz model, and slightly smaller band gap values were obtained. C-V characteristics of sandwich structures yielded high permittivity of 380 in pure NKN films and tunability at 1 kHz of 3.2% at 1.5 MV/m applied electric field.

AB - Thin films of lead-free NaxK1-xNbO3 (NKN) were prepared by pulsed laser deposition (PLD) from ceramic targets of stoichiometric NKN or doped with 6% of lithium niobate (LN). At a deposition temperature of 600°C a strong dependence of film morphology on laser fluence is revealed by SEM microscopy. Optical properties like band gap and index of refraction were obtained through transmission measurements and analysis based on the Tauc model. The results were compared to spectral ellipsometry using a fit to the Tauc-Lorentz model, and slightly smaller band gap values were obtained. C-V characteristics of sandwich structures yielded high permittivity of 380 in pure NKN films and tunability at 1 kHz of 3.2% at 1.5 MV/m applied electric field.

KW - Band gap

KW - NKN

KW - Optical transmission

KW - PLD

KW - Spectral ellipsometry

KW - Thin film

UR - https://www.scopus.com/pages/publications/84888623419

U2 - 10.1080/00150193.2013.821018

DO - 10.1080/00150193.2013.821018

M3 - Conference article

AN - SCOPUS:84888623419

SN - 0015-0193

VL - 446

SP - 118

EP - 127

JO - Ferroelectrics

JF - Ferroelectrics

IS - 1

T2 - 11th European Conference on Applications of Polar Dielectrics, ECAPD 2012

Y2 - 9 July 2012 through 13 July 2012

ER -

Optical properties of lead-free NKN films from transmission and spectral ellipsometry

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