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Modifications of the CZTSe/Mo back-contact interface by plasma treatments

Chen, Wenjian; Taskesen, Teoman; Nowak, David; Mikolajczak, Ulf; Sayed, Mohamed H.; Pareek, Devendra; Ohland, Jörg; Schnabel, Thomas; Ahlswede, Erik; Hauschild, Dirk; Weinhardt, Lothar; Heske, Clemens; Parisi, Jürgen; Gütay, Levent

Abstract:
Molybdenum (Mo) is the most commonly used back-contact material for copper zinc tin selenide (CZTSe)-based thin-film solar cells. For most fabrication methods, an interfacial molybdenum diselenide (MoSe₂) layer with an uncontrolled thickness is formed, ranging from a few tens of nm up to ≈1 mm. In order to improve the control of the back-contact interface in CZTSe solar cells, the formation of a MoSe₂ layer with a homogeneous and defined thickness is necessary. In this study, we use plasma treatments on the as-grown Mo surface prior to the CZTSe absorber formation, which consists of the deposition of stacked metallic layers and the annealing in selenium (Se) atmosphere. The plasma treatments include the application of a pure argon (Ar) plasma and a mixed argon–nitrogen (Ar–N₂) plasma. We observe a clear impact of the Ar plasma treatment on the MoSe2 thickness and interfacial morphology. With the Ar–N₂ plasma treatment, a nitrided Mo surface can be obtained. Furthermore, we combine the Ar plasma treatment with the application of titanium nitride (TiN) as back-contact barrier and discuss the obtained results in terms of MoSe₂ formation and solar cell performance, thus showing possible directions of back-contact engineering for CZTSe solar cells.

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Verlagsausgabe §
DOI: 10.5445/IR/1000098340
Veröffentlicht am 18.09.2019
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Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen-ID: 1000098340
HGF-Programm 56.03.10 (POF III, LK 01)
Erschienen in RSC Advances
Band 9
Heft 46
Seiten 26850–26855
Vorab online veröffentlicht am 28.08.2019
Nachgewiesen in Web of Science
Scopus
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