Ludwig, Christian D. R.; Gruhn, Thomas; Felser, Claudia; Schilling, Tanja; Windeln, Johannes; Kratzer, Peter:
Indium-Gallium Segregation in CuIn_xGa_{1-x}Se_2: Ab Initio–Based Monte Carlo Study
2010
In: Physical Review Letters, Jg. 105 (2010), Heft 2, S. 025702/1-4
Artikel/Aufsatz in Zeitschrift2010Physik
Titel:
Indium-Gallium Segregation in CuIn_xGa_{1-x}Se_2: Ab Initio–Based Monte Carlo Study
Autor(in):
Ludwig, Christian D. R.; Gruhn, Thomas; Felser, Claudia; Schilling, Tanja; Windeln, Johannes; Kratzer, PeterLSF
Erscheinungsjahr
2010
DOI:

Abstract:

Thin-film solar cells with CuIn_xGa_{1-x}Se_2 (CIGS) absorber are still far below their efficiency limit, although lab cells already reach 20.1%. One important aspect is the homogeneity of the alloy. Large-scale simulations combining Monte Carlo and density functional calculations show that two phases coexist in thermal equilibrium below room temperature. Only at higher temperatures, CIGS becomes more and more a homogeneous alloy. A larger degree of inhomogeneity for Ga-rich CIGS persists over a wide temperature range, which contributes to the observed low efficiency of Ga-rich CIGS solar cells