Positron Structural Analysis of ScN Films Deposited on MgO Substrate
Positron Structural Analysis of ScN Films Deposited on MgO Substrate
More-Chevalier, J.; Horák, L.; Cichoň, S.; Hruška, P.; Čížek, J.; Liedke, M. O.; Butterling, M.; Wagner, A.; Bulíř, J.; Hubík, P.; Gedeonová, Z.; Lančok, J.
Scandium nitride (ScN) is a semiconductor with a rocksalt-structure that has attracted attention for its potential applications in thermoelectric energy conversion devices, as a semiconducting component in epitaxial metal/semiconductor superlattices. Two ScN films of 118 nm and 950 nm thicknesses were deposited at the same conditions on MgO (001) substrate by reactive magnetron sputtering. Poly-orientation of films was observed with first an epitaxial growth on MgO and then a change in the orientation growth due to the decrease of the adatom mobility during the film growth. Positron lifetime measurements showed a high concentration of nitrogen vacancies in both films with a slightly higher concentration for the thicker ScN film. Presence of nitrogen vacancies explains the values of direct band gaps of 2:53+-0:01 eV, and 2:56+-0:01 eV which has been measured on ScN films of 118 nm and 950 nm thicknesses, respectively.
Keywords: positron annihilation; semiconductor; ScN; band gap; defects; vacancies
Involved research facilities
- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
- P-ELBE
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- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 30862) publication
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Acta Physica Polonica A 137(2020)2, 209-214
Online First (2020) DOI: 10.12693/APhysPolA.137.209
Cited 3 times in Scopus
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