Refractive indices of layers and optical simulations of Cu(In,Ga)Se.sub.2./sub. solar cells

0492880 - FZÚ 2019 RIV NL eng J - Journal Article
Carron, R. - Avancini, E. - Feurer, T. - Bissig, B. - Losio, P.A. - Figi, R. - Schreiner, C. - Bürki, M. - Bourgeois, E. - Remeš, Zdeněk - Nesladek, M. - Buecheler, S. - Tiwari, A. N.
Refractive indices of layers and optical simulations of Cu(In,Ga)Se₂ solar cells.
Science and Technology of Advanced Materials. Roč. 19, č. 1 (2018), s. 396-410. ISSN 1468-6996. E-ISSN 1878-5514
Institutional support: RVO:68378271
Keywords : CIGS * refractive index * optical simulations * thin films * solar cells * absorption losses * carrier collection losses * optical losses
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.585, year: 2018

Cu(In,Ga)Se-2-based solar cells have reached efficiencies close to 23%. Further knowledge-driven improvements require accurate determination of the material properties. Here, we present refractive indices for all layers in Cu(In,Ga)Se-2 solar cells with high efficiency. The optical bandgap of Cu(In,Ga)Se-2 does not depend on the Cu content in the explored composition range, while the absorption coefficient value is primarily determined by the Cu content. An expression for the absorption spectrum is proposed, with Ga and Cu compositions as parameters. This set of parameters allows accurate device simulations to understand remaining absorption and carrier collection losses and develop strategies to improve performances.
Permanent Link: http://hdl.handle.net/11104/0286341