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Optical characterization of CuIn3Se5, CuGa3Se5and CuGa5Se8crystals by spectroscopic ellipsometry

✍ Scribed by León, M. ;Serna, R. ;Levcenko, S. ;Nateprov, A. ;Nicorici, A. ;Merino, J. M. ;Arushanov, E.

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
248 KB
Volume
203
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

The ellipsometric spectra of CuIn~3~Se~5~, CuGa~3~Se~5~ and CuGa~5~Se~8~ ordered vacancy compounds (OVC) have been studied in the spectral range from 0.8 to 4.4 eV. The structures observed in the measured spectra were analyzed by fitting the second derivative of the experimental spectrum to analytical line shapes. The energies corresponding to different electronic transitions were determined. The lowest direct gap (E ~0~) is characterized by 3‐dimensional critical points, while higher energy structures are characterized by 2D critical points. Optical constants related to dielectric function, such as the complex refractive index n *(ω ), extinction coefficient k (ω ), absorption coefficient α (ω ), and normal‐incidence reflectivity R (ω ), of studied OVC were determined. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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