Journal
THIN SOLID FILMS
Volume 519, Issue 21, Pages 7508-7512Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2010.12.217
Keywords
Cu(In,Ga)Se-2; Cu2ZnSn(S,Se)(4); GW; Solar cells; Density-of-states; Dielectric function; Absorption
Categories
Funding
- Swedish Energy Agency
- Swedish Research Council
- computer centers NSC and HPC2N through SNIC/SNAC
Ask authors/readers for more resources
The optical properties of CuInSe2, CuGaSe2, Cu2ZnSnS4, and Cu2ZnSnSe4 are investigated using three different first-principles methods, namely the generalized gradient approximation by Perdew. Burke, and Ernzerhof (PBE), the hybrid Hartree-Fock-like functional by Heyd. Scuseria, and Emzerhof (HSE), and a Green's function approach (GW). The density-of-states, the complex dielectric function epsilon(omega) = epsilon(1)(omega) + i epsilon(2)(omega), and the optical absorption coefficient alpha(omega) are determined, providing fundamental understanding of these materials. We find that even though the PBE method generates fairly accurate effective crystal potentials, the HSE and GW methods improve considerably the band-gap energies E-g and also the localization of the semicore states, thereby describing the optical properties much better. Furthermore, we also present optimized convergence parameters for the self-consistent HSE calculation in order to reduce the computational time of this orbital-dependent method. (C) 2011 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available