Park, Jun-Woo Song, Misun Yoon, Seokhyun Lim, Hyung Kwang Jeong, Doo Seok Cheong, Byung-Ki Lee, Hosun 2024-01-20T13:02:04Z 2024-01-20T13:02:04Z 2022-01-25 2013-02 1862-6300 https://pubs.kist.re.kr/handle/201004/128373 Ge(1-x)Tex thin films were grown using thermal coevaporation deposition. The dielectric functions and the phonon modes of amorphous (a-) and crystalline (c-) Ge1-xTex films were measured using spectroscopic ellipsometry and Raman spectroscopy in order to investigate electronic and vibrational properties of these alloys. Using the second derivative spectra of the dielectric functions of a-Ge1-xTex alloys and the standard critical point (SCP) model, we obtained optical transition energies for the a-Ge1-xTex alloys. The optical transition energies were not only consistent with the density of states (DOS) reported in the literature, but also provided more detailed structures for the joint density of states (JDOS) of a-Ge1-xTex. [GRAPHICS] . The second derivative spectra of d(2)epsilon(E)/dE(2) for amorphous GeTe. The transition energies were estimated using SCP model (short arrows) and were compared to those of photoemission spectroscopy from literature (long arrows). (C) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim English Wiley - V C H Verlag GmbbH & Co. Structural and optical properties of phase-change amorphous and crystalline Ge1-xTex (0 < x < 1) thin films Article 10.1002/pssa.201228555 1 Physica Status Solidi (A) Applications and Materials, v.210, no.2, pp.267 - 275 Physica Status Solidi (A) Applications and Materials 210 2 267 275 N scie scopus 000315269800004 2-s2.0-84874065636 Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Materials Science Physics Article DIELECTRIC-FUNCTION LOCAL-STRUCTURE RAMAN-SCATTERING GE-TE MODEL germanium telluride joint density of states Raman spectroscopy spectroscopic ellipsometry