Band gaps and phonons of quasi-bulk rocksalt ScN
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F24%3A00138737" target="_blank" >RIV/00216224:14310/24:00138737 - isvavai.cz</a>
Result on the web
<a href="https://journals.aps.org/prmaterials/pdf/10.1103/PhysRevMaterials.8.L071601" target="_blank" >https://journals.aps.org/prmaterials/pdf/10.1103/PhysRevMaterials.8.L071601</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevMaterials.8.L071601" target="_blank" >10.1103/PhysRevMaterials.8.L071601</a>
Alternative languages
Result language
angličtina
Original language name
Band gaps and phonons of quasi-bulk rocksalt ScN
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review Materials
ISSN
2475-9953
e-ISSN
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Volume of the periodical
8
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
1-8
UT code for WoS article
001273886400001
EID of the result in the Scopus database
2-s2.0-85198902824