Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 72: Poster Session: Si-based Photovoltaics / Inorganic Photovoltaics / Structure and Transport in Organic Photovoltaics / Organic Semiconductors

HL 72.7: Poster

Mittwoch, 28. März 2012, 16:00–19:00, Poster D

Synthesis and Characterization of Kesterite Nanoparticles and Thin Films with XRD and GDOES — •Folker Zutz, Christine Chory, Martin Knipper, Ingo Riedel, and Jürgen Parisi — University of Oldenburg, Department of Physics, Energy and Semiconductor Research Laboratory, 26111 Oldenburg, Germany

Cu₂ZnSnS₄ (CZTS) is a promising compound semiconductor for low cost solar cells, because of its non-toxic and abundant precursor elements. An approach for economic manufacturing is an ink-based thin film deposition process. The inks are made from dispersions of CZTS nanoparticles, which were prepared by colloidal synthesis at low temperatures. The thin films were realized by drop casting and treated by a post-deposition annealing in inert gas atmosphere in order to remove organic stabilizers from the film and to enhance growth of polycrystalline structures. Structural investigations of dried CZTS powders with varying chemical compositions at different annealing temperatures were performed via X-ray diffraction. The development of the Kesterite phase and secondary impurity phases was investigated in order to archive a more pure CZTS material. The element distribution in the CZTS thin films was investigated by glow discharge optical emission spectroscopy (GDOES). By this method the CZTS elements and also organic compounds like precursors used during synthesis or high-boiling solvents used for the nano-ink formulation were probed. Thus the effectiveness of the NP purification and the film annealing can be analyzed.