Band gaps and phonons of quasi-bulk rocksalt ScN

J 2024

Band gaps and phonons of quasi-bulk rocksalt ScN

GRUEMBEL, Jona; Rudiger GOLDHAHN; Martin FENEBERG; Yuichi OSHIMA; Adam DUBROKA et. al.

Základní údaje

Originální název

Band gaps and phonons of quasi-bulk rocksalt ScN

Autoři

GRUEMBEL, Jona; Rudiger GOLDHAHN; Martin FENEBERG; Yuichi OSHIMA; Adam DUBROKA a Manfred RAMSTEINER

Vydání

Physical Review Materials, American Physical Society, 2024, 2475-9953

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10302 Condensed matter physics

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.400

Kód RIV

RIV/00216224:14310/24:00138737

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1103/PhysRevMaterials.8.L071601

UT WoS

001273886400001

EID Scopus

2-s2.0-85198902824

Klíčová slova anglicky

Dielectric properties; Phonons; Ellipsometry; Optical techniques; Raman spectroscopy

Štítky

14312020, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 31. 1. 2025 16:50, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

ScN is an emerging transition metal nitride with unique physical properties arising from the d electrons of Sc. In this letter, we present the results of optical characterization techniques: spectroscopic ellipsometry, Raman spectroscopy, and photoluminescence measurements of a 40-mu m-thick fully relaxed, and only weakly n-type doped (n = 1.2 x 10(18) cm(-3)) ScN film deposited by halide vapor phase epitaxy (HVPE) on r-sapphire substrate. Spectroscopic ellipsometry yields an indirect band gap of 1.1 eV, while the lowest direct interband transition is observed at E-g,E-opt = 2.16 eV in the dielectric function. A broad luminescence feature at 2.15 eV is observed, matching this transition. We derive an estimate for the exciton binding energy (E-bX approximate to 14 meV) as well as the Born effective charges Z(Sc)*= -Z(N)(& lowast;) = 3.81. In the infrared spectral region, we observe a strong phonon and a weak plasmon absorption. We precisely determine the transverse optical (TO) phonon eigenfrequency (omega(TO) = 340.7 cm(-1)), the high frequency dielectric constant (epsilon(infinity) = 8.3), and the static dielectric constant (estat = 29.5). Raman measurements using various excitation energies show resonant multiphonon scattering up to 6LO [sixth-order overtone for longitudinal optical (LO) phonons] for excitation above the optical band gap (E-Laser > E-g,E-opt), where the allowed 2LO scattering is the dominant scattering mechanism for all excitation energies. Their characteristic parameters determined from Lorentzian line shape fitting yield omega(LO) = 684.5 cm-1 and an increased broadening for higher LO scattering order n.

Návaznosti

EH22_008/0004572, projekt VaV

Název: Kvantové materiály pro aplikace v udržitelných technologiích

GA20-10377S, projekt VaV

Název: Jevy v heterostrukturách oxidů přechodových kovů vyvolané dopováním a rozhraním (Akronym: TMO Heterostructures)

Investor: Grantová agentura ČR, Jevy v heterostrukturách oxidů přechodových kovů vyvolané dopováním a rozhraním

90251, velká výzkumná infrastruktura

Název: CzechNanoLab II

Citovat

GRUEMBEL, Jona; Rudiger GOLDHAHN; Martin FENEBERG; Yuichi OSHIMA; Adam DUBROKA a Manfred RAMSTEINER. Band gaps and phonons of quasi-bulk rocksalt ScN. Physical Review Materials. American Physical Society, 2024, roč. 8, č. 7, s. 1-8. ISSN 2475-9953. Dostupné z: https://doi.org/10.1103/PhysRevMaterials.8.L071601.

@article{2473022,
   author = {Gruembel, Jona and Goldhahn, Rudiger and Feneberg, Martin and Oshima, Yuichi and Dubroka, Adam and Ramsteiner, Manfred},
   article_number = {7},
   doi = {https://doi.org/10.1103/PhysRevMaterials.8.L071601},
   keywords = {Dielectric properties; Phonons; Ellipsometry; Optical techniques; Raman spectroscopy},
   language = {eng},
   issn = {2475-9953},
   journal = {Physical Review Materials},
   title = {Band gaps and phonons of quasi-bulk rocksalt ScN},
   url = {https://journals.aps.org/prmaterials/pdf/10.1103/PhysRevMaterials.8.L071601},
   volume = {8},
   year = {2024}
}

TY  - JOUR
ID  - 2473022
AU  - Gruembel, Jona - Goldhahn, Rudiger - Feneberg, Martin - Oshima, Yuichi - Dubroka, Adam - Ramsteiner, Manfred
PY  - 2024
TI  - Band gaps and phonons of quasi-bulk rocksalt ScN
JF  - Physical Review Materials
VL  - 8
IS  - 7
SP  - 1-8
EP  - 1-8
PB  - American Physical Society
SN  - 24759953
KW  - Dielectric properties
KW  - Phonons
KW  - Ellipsometry
KW  - Optical techniques
KW  - Raman spectroscopy
UR  - https://journals.aps.org/prmaterials/pdf/10.1103/PhysRevMaterials.8.L071601
N2  - ScN is an emerging transition metal nitride with unique physical properties arising from the d electrons of Sc. In this letter, we present the results of optical characterization techniques: spectroscopic ellipsometry, Raman spectroscopy, and photoluminescence measurements of a 40-mu m-thick fully relaxed, and only weakly n-type doped (n = 1.2 x 10(18) cm(-3)) ScN film deposited by halide vapor phase epitaxy (HVPE) on r-sapphire substrate. Spectroscopic ellipsometry yields an indirect band gap of 1.1 eV, while the lowest direct interband transition is observed at E-g,E-opt = 2.16 eV in the dielectric function. A broad luminescence feature at 2.15 eV is observed, matching this transition. We derive an estimate for the exciton binding energy (E-bX approximate to 14 meV) as well as the Born effective charges Z(Sc)*= -Z(N)(& lowast;) = 3.81. In the infrared spectral region, we observe a strong phonon and a weak plasmon absorption. We precisely determine the transverse optical (TO) phonon eigenfrequency (omega(TO) = 340.7 cm(-1)), the high frequency dielectric constant (epsilon(infinity) = 8.3), and the static dielectric constant (estat = 29.5). Raman measurements using various excitation energies show resonant multiphonon scattering up to 6LO [sixth-order overtone for longitudinal optical (LO) phonons] for excitation above the optical band gap (E-Laser > E-g,E-opt), where the allowed 2LO scattering is the dominant scattering mechanism for all excitation energies. Their characteristic parameters determined from Lorentzian line shape fitting yield omega(LO) = 684.5 cm-1 and an increased broadening for higher LO scattering order n.
ER  -

GRUEMBEL, Jona; Rudiger GOLDHAHN; Martin FENEBERG; Yuichi OSHIMA; Adam DUBROKA a Manfred RAMSTEINER. Band gaps and phonons of quasi-bulk rocksalt ScN. \textit{Physical Review Materials}. American Physical Society, 2024, roč.~8, č.~7, s.~1-8. ISSN~2475-9953. Dostupné z: https://doi.org/10.1103/PhysRevMaterials.8.L071601.

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