Berlin 2012 – scientific programme
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DS: Fachverband Dünne Schichten
DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)
DS 44.6: Poster
Friday, March 30, 2012, 09:30–12:00, Poster E
Influence of the sintering process on the structure of Cu2ZnSnS4 nanocrystal thin films — •Kai Kornhuber1, Jaison Kavalakkatt1,2, Xianzhong Lin1, Patryk Kusch2, Ahmed Ennaoui1, and Martha C. Lux-Steiner1,2 — 1Helmholtz Center Berlin for Materials and Energy, Berlin, Germany — 2Freie Universität Berlin, Berlin, Germany
Cu2ZnSnS4 (CZTS) is a p-type emerging semiconductor solar absorber with optimal direct band gap energy of 1.5 eV and a large absorption coefficient above 104 cm−1. It is structurally similar to Cu(In,Ga)Se2 and contains only earth abundant, non-toxic elements. Recently promising energy conversion efficiencies of up to 10.1 % were demonstrated [D.Barkhouse, O.Gunawan, et. al, Prog. Photovolt: Res. Appl. (2011)]. So far, all preparation methods require an annealing step to improve the cristallinity. This process is not completely understood, suffering from the presence of secondary phases such as ZnS, CuxSnSy and CuxS. In this work, a solution based approach to prepare CZTS-nanoparticle ink was used for CZTS thin film deposition on Mo-coated glass and FTO. The processing under different temperatures and atmospheres (Ar, H2S) allowed to obtain compact film material. Combining X-ray diffraction and Raman spectroscopy as complimentary phase resolving techniques, identification of phases present in multi-phase CZTS thin films was accomplished. The results of the Raman- and XRD-analysis of the phases formed and the advantages of using these techniques are presented. Furthermore UV-Vis-spectroscopy was applied to investigate changes of the optical properties.