Article (Scientific journals)
The effect of KF post-deposition treatments on the optoelectronic properties of Cu(In,Ga)Se2 single crystals
RAMIREZ SANCHEZ, Omar; Bertrand, Maud; DEBOT, Alice et al.
2021In Solar RRL
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Keywords :
CIGSe; single crystals; alkali post-deposition treatments
Abstract :
[en] The power conversion efficiency boost of Cu(In,Ga)Se2 in the past years has been possible due to the incorporation of heavy alkali atoms. Their addition through post-deposition treatments results in an improvement of the open-circuit voltage, which origin has been associated with grain boundaries. The present work discusses the effect of potassium fluoride post-deposition treatments on the optoelectronic properties of a series of sodium-free Cu(In,Ga)Se2 single crystals with varying Cu and Ga content. Results suggest that improvement of the quasi-Fermi level splitting can be achieved despite the absence of grain boundaries, being greater in low-gallium Cu-poor absorbers. Secondary ion mass spectrometry reveals the presence of potassium inside the bulk of the films, suggesting that transport of potassium can occur through grain interiors. In addition, a type inversion from n to p in KF-treated low-gallium Cu(In,Ga)Se2 is observed, which along a carrier lifetime study demonstrates that potassium can act as a dopant. The fact that potassium by its own can alter the optoelectronic properties of Cu(In,Ga)Se2 single crystals demonstrates that the effect of post-deposition treatments goes beyond grain boundary passivation.
Disciplines :
Physics
Author, co-author :
RAMIREZ SANCHEZ, Omar ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Bertrand, Maud;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
DEBOT, Alice ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
SIOPA, Daniel ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Valle, Nathalie;  Luxembourg Institute of Science & Technology - LIST > Materials Research and Technology
Schmauch, Jörg;  Saarland University > Experimental Physics
SIEBENTRITT, Susanne ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
yes
Language :
English
Title :
The effect of KF post-deposition treatments on the optoelectronic properties of Cu(In,Ga)Se2 single crystals
Publication date :
2021
Journal title :
Solar RRL
eISSN :
2367-198X
Publisher :
Wiley, Weinheim, Germany
Peer reviewed :
Peer Reviewed verified by ORBi
Focus Area :
Physics and Materials Science
FnR Project :
FNR11696002 - Grain Boundaries In Solar Cells, 2017 (01/07/2018-31/12/2021) - Alex Redinger
Available on ORBilu :
since 19 March 2021

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