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Crystalline ordered states of CuIn 1-xGa xSe 2 (x = 0, 0.3, and 1.0) thin-films on different substrates investigated by Raman scattering spectroscopy

Title
Crystalline ordered states of CuIn 1-xGa xSe 2 (x = 0, 0.3, and 1.0) thin-films on different substrates investigated by Raman scattering spectroscopy
Authors
Jeong A.R.Jo W.Song M.Yoon S.
Ewha Authors
조윌렴윤석현
SCOPUS Author ID
조윌렴scopus; 윤석현scopus
Issue Date
2012
Journal Title
Materials Chemistry and Physics
ISSN
0254-0584JCR Link
Citation
vol. 134, no. 41308, pp. 1030 - 1035
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Structural properties of Cu(In,Ga)Se 2 absorber layers have been examined for photovoltaic applications. Thin-films with three different chemical compositions, CuInSe 2 (CIS), Cu(In,Ga)Se 2 (CIGS) and CuGaSe 2 (CGS), were grown by co-evaporation on two kinds of substrates: Mo-coated soda-lime glass and bare soda-lime glass. Intriguing morphology and grain-growth behaviors were found in the surface of the films. X-ray diffraction of the films exhibited phase formation of the stoichiometric chalcopyrite phase of the materials while signs of secondary phases like Cu 2Se and Cu-Se 2 were also observed. The optical transmittance of the films was measured to obtain their optical bandgaps, which were well matched with the bulk values of CIS, CIGS, and CGS, which are 1.1, 1.4, and 1.7 eV, respectively. Using Raman scattering spectroscopy, the A 1 mode was observed to shift from 177 cm -1 for CIS to 189 cm -1 for CGS as the Ga content increased. The films on Mo substrates are likely to have secondary phases, which is not the case for soda-lime glass. An indication of the formation of the CuAu structure is obtained from the CIS thin-films. © 2012 Elsevier B.V. All rights reserved.
DOI
10.1016/j.matchemphys.2012.03.107
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자연과학대학 > 물리학전공 > Journal papers
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