cathodoluminescence spectroscopy; chalcopyrite solar cells; industrial processes; photoluminescence spectroscopy; silver alloying; Cathodoluminescence spectroscopy; Chalcopyrite solar cells; Grainsize; Industrial processs; Lateral inhomogeneity; Low bandgap; Non-radiative loss; Silver alloying; Wide-band-gap; Electronic, Optical and Magnetic Materials; Atomic and Molecular Physics, and Optics; Energy Engineering and Power Technology; Electrical and Electronic Engineering
Abstract :
[en] Alloying small quantities of silver into Cu(In,Ga)Se2 is shown to improve the efficiency for wide and low bandgap solar cells. Low bandgap industrial Cu(In,Ga)(S,Se)2 absorbers are studied, substituting less than 10% of the copper with silver, using absolute photoluminescence and cathodoluminescence spectroscopy. Silver improves the grain size and promotes the interdiffusion of Ga and In across the depth of the absorber, resulting in a smoother bandgap gradient. However, a certain lateral inhomogeneity is observed near the front and back sides. The nonradiative losses in the bare absorbers are reduced by up to 30 meV.
Disciplines :
Physics
Author, co-author :
PROT, Aubin Jean-Claude Mireille ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
MELCHIORRE, Michele ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Schaaf, Tilly; Laboratory for Photovoltaics, Physics and Materials Science Research Unit, University of Luxembourg, Belvaux, Luxembourg
GONCALINHO POEIRA, Ricardo Jorge ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
ELANZEERY, Hossam ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Physics and Materials Science ; AVANCIS GmbH, München, Germany
LOMUSCIO, Alberto ; University of Luxembourg > Faculty of Science, Technology and Medicine > Department of Physics and Materials Science > Team Susanne SIEBENTRITT ; AVANCIS GmbH, München, Germany
Kusch, Gunnar ; Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, United Kingdom
Hu, Yucheng ; Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, United Kingdom
Oliver, Rachel Angharad ; Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, United Kingdom
SIEBENTRITT, Susanne ; University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
FNR15050982 - Radiative Efficiency In Advanced Sulfide Chalcopyrites For Solar Cells, 2021 (15/10/2022-14/10/2024) - Susanne Siebentritt
Funders :
Engineering and Physical Sciences Research Council
Funding text :
This work was supported by Avancis, Germany, in the framework of the POLCA project, and by EPSRC in the framework of the REACH project (EP/V029231/1), which are gratefully acknowledged. The authors thank Dr. Mohit Sood for his suggestions and discussion.
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