TITLE

Effect of Cu deficiency on the optical properties and electronic structure of CuInSe2 and CuIn0.8Ga0.2Se2 determined by spectroscopic ellipsometry

AUTHOR(S)
Sung-Ho Han; Hermann, Allen M.; Hasoon, F. S.; Al-Thani, H. A.; Levi, D. H.
PUB. DATE
July 2004
SOURCE
Applied Physics Letters;7/26/2004, Vol. 85 Issue 4, p576
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Spectroscopic ellipsometry measurements of CuInSe2 (CIS) and CuIn0.8Ga0.2Se2 (CIGS) reveal that there are important differences in electronic properties between stoichiometric CIS (CIGS) and Cu-poor CIS (CIGS). We find a reduction in the absorption strength in the spectral region of 1–3 eV. This reduction can be explained in terms of the Cu 3d density of states. Cu-poor CIS (CIGS) materials show an increase in band gap due to the reduction in repulsion between Cu 3d and Se 4p states. The experimental results have important implications for the function of polycrystalline optoelectronic devices.
ACCESSION #
13885868

 

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