Berlin 2012 – wissenschaftliches Programm

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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

Freitag, 30. März 2012, 09:30–12:00, Poster E

Influence of the sintering process on the structure of Cu2ZnSnS4 nanocrystal thin films — •Kai Kornhuber¹, Jaison Kavalakkatt^1,2, Xianzhong Lin¹, Patryk Kusch², Ahmed Ennaoui¹, and Martha C. Lux-Steiner^1,2 — 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, Cu_xSnS_y and Cu_xS. 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.