Impact of metallic potassium post-deposition treatment on epitaxial Cu(In, Ga)Se2

Martin Lanzoni, Evandro; Ramirez Sanchez, Omar; Phirke, Himanshu; Elizabeth, Amala; Mönig, Harry; Redinger, Alex

doi:10.1016/j.tsf.2021.139002

Reference : Impact of metallic potassium post-deposition treatment on epitaxial Cu(In, Ga)Se2


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Physics
	Focus Areas :	Physics and Materials Science
	To cite this reference:	http://hdl.handle.net/10993/49392

Title :	Impact of metallic potassium post-deposition treatment on epitaxial Cu(In, Ga)Se2
Language :	English
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) >]
Publication date :	14-Nov-2021
Journal title :	Thin Solid Films
Publisher :	Elsevier
Peer reviewed :	Yes
Audience :	International
Keywords :	[en] 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.
Permalink :	http://hdl.handle.net/10993/49392
DOI :	10.1016/j.tsf.2021.139002
FnR project :	FnR ; FNR11244141 > Alex Redinger > SUNSPOT > Surface And Interface Science On Photovoltaic Materials > 15/03/2017 > 14/09/2022 > 2016

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