Indium-Gallium Segregation in CuIn_xGa_{1-x}Se_2: Ab Initio–Based Monte Carlo Study
In: Physical Review Letters, Vol. 105 (2010), No. 2, S. 025702/1-4
Title:
Indium-Gallium Segregation in CuIn_xGa_{1-x}Se_2: Ab Initio–Based Monte Carlo Study
Author:
Ludwig, Christian D. R.;Gruhn, Thomas;Felser, Claudia;Schilling, Tanja;Windeln, Johannes;Kratzer, PeterUDE
- GND
- 1266252894
- LSF ID
- 14826
- ORCID
- 0000-0001-5947-1366
- Other
- connected with university
Year of publication:
2010
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