Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 39: Topical Session Photovoltaic Materials III
MM 39.3: Talk
Wednesday, March 24, 2010, 15:15–15:30, H4
Real-time investigations on the formation reactions in the system Cu-Sn-S — •Roland Schurr, Astrid Hölzing, and Rainer Hock — Lehrstuhl für Kristallographie und Strukturphysik, Universität Erlangen-Nürnberg, Staudtstraße 3, D-91058 Erlangen
The quaternary compound kesterite Cu2ZnSnS4 (CZTS) is a promising candidate for the production of low-cost thin film solar cells. CZTS thin film solar cells with efficiencies of up to 6.77% were produced [1].
The understanding of the recurrent formation reactions in the system Cu-Zn-Sn-S is necessary for the optimization of CZTS absorbers and the development of low-cost thin film solar cells. In a previous publication we presented the formation of CZTS thin film solar cell absorbers from co-electroplated precursors depending on the metal ratios in the as deposited films [2]. The crystallisation of CZTS is completed by the reaction of Cu2SnS3 and ZnS. Further reactions mainly involved are the formation of binary and ternary Cu-Sn sulfides. Due to the phase diagrams of Olekseyuk et al. [3] of the ZnS-SnS2 and Cu2S-ZnS systems, the system Cu2S-SnS2 forms Cu-Sn sulfides at low temperatures. Real-time investigations on the formation reactions in the ternary subsystems of Cu-Zn-Sn-S while annealing stacked elemental layers provide the reaction paths of the binary and ternary sulfides.
In the present work we report on results of in-situ XRD experiments on the formation mechanisms with main focus on the Cu-Sn-S system.
[1] H. Katagiri et al., Appl. Phys. Express 1 (2008) 041201
[2] R. Schurr et al., Thin Solid Films 237 (2009) 2465
[3] I.D. Olekseyuk et al., J. Alloys Compd. 368 (2004) 135
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