The optical bandgap of lithium niobate (LiNbO3) and its dependence with temperature

•This work investigates the optical bandgap Egap of congruent LiNbO3, as determined by optical transmission measurements.•Accordingly, the indirect Egap of LiNbO3 was found to comply withEgapINDT=3.96-0.311coth0.042kBT-1, rendering EgapIND300K=3.77±0.05 eV. Notwithstanding the great scientific−techn...

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Bibliographic Details
Published inResults in physics Vol. 39; p. 105736
Main Author Zanatta, A.R.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.08.2022
Elsevier
Subjects
Lithium niobate (LiNbO3)
Optical bandgap
Optical spectroscopy
Photonic devices
Lithium niobate (LiNbO3)
Optical bandgap
Optical spectroscopy
Photonic devices
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Summary:•This work investigates the optical bandgap Egap of congruent LiNbO3, as determined by optical transmission measurements.•Accordingly, the indirect Egap of LiNbO3 was found to comply withEgapINDT=3.96-0.311coth0.042kBT-1, rendering EgapIND300K=3.77±0.05 eV. Notwithstanding the great scientific−technological interest in lithium niobate (LiNbO3), its optical bandgap Egap has been subject of intense discussion. So far, the literature exhibits different Egap values spanning over about 2 eV and comprises a mixture of compositions, structures, and theoretical methods − not always clearly indicated or discussed. In view of that, this work presents a thorough investigation of the Egap (at room-temperature and in the ∼80–800 K temperature range) of the congruent ferroelectric LiNbO3 (Z-cut) single crystal.
ISSN:2211-3797
2211-3797
DOI:10.1016/j.rinp.2022.105736