Article (Scientific journals)
Impact of metallic potassium post-deposition treatment on epitaxial Cu(In, Ga)Se2
MARTIN LANZONI, Evandro; RAMIREZ SANCHEZ, Omar; PHIRKE, Himanshu et al.
2021In Thin Solid Films
Peer reviewed
 

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Keywords :
Alkali post-deposition treatment; Copper indium gallium selenide; Solar cells
Abstract :
[en] Alkali post-deposition treatments (PDTs) of Cu(In, Ga)Se2 (CIGSe) absorbers are known to improve the power conversion efficiency of the thin-film solar cell devices. The PDTs are usually carried out via evaporation of alkali fluorides in a selenium atmosphere onto a hot substrate. In this work, an alkali metal dispenser was used to evaporate pure metallic potassium onto epitaxial CIGSe absorbers. Subsequently, the absorber layers were heated in-situ to monitor chemical reactions and diffusion into the bulk. Due to the absence of grain boundaries, fluorine, and selenium, the effect of K on CIGSe absorber properties can be directly monitored. We find that potassium effectively diffuses into the bulk of epitaxial CIGSe absorber layers. The diffusion depends on the Cucontent of the CIGSe absorbers, in which Cu-depleted films present higher diffusion rates of K. Photoluminescence (PL) imaging corroborates that K in the bulk of the CIGSe absorber increases the PL yield, suggesting a passivation of defects or an increase in doping. This work highlights that alkali PDTs are not limited by interface and grain boundary modifications but also changes the absorber bulk properties, which needs to be taken into account.
Disciplines :
Physics
Author, co-author :
MARTIN LANZONI, Evandro ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
RAMIREZ SANCHEZ, Omar ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
PHIRKE, Himanshu ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
Elizabeth, Amala;  Westfälische Wilhelms-Universität Münster, Münster 48149, Germany ; Center for Nanotechnology (CeNTech), Münster 48149, Germany
Mönig, Harry;  Westfälische Wilhelms-Universität Münster, Münster 48149, Germany ; Center for Nanotechnology (CeNTech), Münster 48149, Germany
REDINGER, Alex ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS)
External co-authors :
yes
Language :
English
Title :
Impact of metallic potassium post-deposition treatment on epitaxial Cu(In, Ga)Se2
Publication date :
14 November 2021
Journal title :
Thin Solid Films
Publisher :
Elsevier
Peer reviewed :
Peer reviewed
Focus Area :
Physics and Materials Science
FnR Project :
FNR11244141 - Surface And Interface Science On Photovoltaic Materials, 2016 (15/03/2017-14/09/2022) - Alex Redinger
Available on ORBilu :
since 09 January 2022

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