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Optical properties ...
Optical properties and electronic structures of (4CuInSe(2))(y)(CuIn5Se8)(1-y)
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Han, Sung-Ho (author)
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- Persson, Clas (author)
- KTH,Tillämpad materialfysik
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Hasoon, Falah S. (author)
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Al-Thani, Hamda A. (author)
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Hermann, Allen M. (author)
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Levi, Dean H. (author)
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(creator_code:org_t)
- 2006
- 2006
- English.
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In: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 74:8
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Spectroscopic ellipsometric measurements of thin polycrystalline (4CuInSe(2))(y)(CuIn5Se8)(1-y) films reveal that there are important differences in optical properties and electronic structures between alpha-phase CuInSe2 and Cu-poor CuInSe2. We report the optical functions of thin-film polycrystalline (4CuInSe(2))(y)(CuIn5Se8)(1-y) and describe how they change depending on the degree of Cu deficiency. We find a reduction in the absorption strength in the spectral region of 1-3 eV for Cu-poor CuInSe2. This reduction can be explained in terms of density of the Cu 3d states in CuInSe2. Cu-poor CuInSe2 samples show an increase in band gap due to reduced p-d interaction. We find that the reduction in the amplitudes of E-0(A,B,C) transitions at the Gamma point and E-1(A,B) transitions at the N point are due to Cu deficiency. Local density approximation calculations with a modeled on-site self-interaction correction of the absorption coefficients of Cu8In8Se16 (CuInSe2), Cu5In9Se16 (CuIn3Se5-like), and Cu2In10Se16 (CuIn5Se8) are in good agreement with those of thin-film polycrystalline CuInSe2 samples with 24.1, 15.6, and 9.1 at. % Cu, respectively.
Keyword
- density-functional theory
- abc2 chalcopyrite semiconductors
- cu(in,ga)se-2 thin-films
- spectroscopic ellipsometry
- solar-cells
- temperature-dependence
- absorption-edge
- phase-relations
- surface-layer
- cuinse2
Publication and Content Type
- ref (subject category)
- art (subject category)
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