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Title

Optical properties and electronic structure of polycrystalline Ag1−xCuxInSe2 alloys

AuthorsAlbornoz, J. G.; Serna, Rosalía ; León, M.
Keywords[PACS] Other semiconductors
[PACS] Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
[PACS] Semiconductor compounds
[PACS] Exchange, correlation, dielectric and magnetic response functions, plasmons
Issue Date6-May-2005
PublisherAmerican Institute of Physics
CitationJournal of Appled Physics 97(10): 103515 (2005)
AbstractThe dielectric function ε(ω) of polycrystalline bulk samples of the quaternary chalcopyrite semiconductors Ag1−xCuxInSe2 with x = 0.0,0.2,0.4,0.6,0.8,1.0 has been determined by spectroscopic ellipsometry in the energy range from 0.5 to 4.7 eV at room temperature. Accurate values of refractive indices n and extinction coefficients k representative of bulk materials are obtained from the data. The value of the main energy gap is very sensitive to the composition and varies from 1.225 to 1.009 eV as x increases (Cu content). The structures observed in ε(ω) have been analyzed by fitting the numerically differentiated experimental spectrum (second derivative) to analytical line shapes. As a result, the energies corresponding to different electronic transitions have been determined as a function of the composition, and they have been identified within the electronic band structure of chalcopyrites.
Description7 pags. ; 7 figs. ; 2 tabs.
Publisher version (URL)http://dx.doi.org/10.1063/1.1899243
URIhttp://hdl.handle.net/10261/45738
DOI10.1063/1.1899243
ISSN0021-8979
E-ISSN1089-7550
Appears in Collections:(CFMAC-IO) Artículos
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