Novel chalcogenides for photovoltaic applications – crystal growth, structural and physical properties Yvonne Tomm 1 Galina Gurieva 1 , Susan Schorr 1,2 1 Helmholtz-Zentrum Berlin, Germany 2 Institute of Geological Sciences, Freie Universität Berlin, Germany Chalcogenides are becoming increasingly important materials for photovoltaic applications that combine ideal properties as solar absorbers with earth-abundant and low-toxic components. In particular, adamantine-type compounds, including kesterites (Cu 2 ZnSnS 4 ), are currently the most promising material for fully inorganic thin- film photovoltaic technology that is free of critical raw materials and thus offers sustainable solutions. Ternary adamantines like the chalcopyrites can be transferred by chemical substitution to a quaternary adamantine such as A I 2 B II C IV X VI 4 (e.g. Cu 2 ZnSnS 4 ) and A I B III C IV X VI 4 (e. g. CuGaGeS 4 ) compounds, the latter are called defect adamantines [Pamplin, 1981]. Besides the Cu-containing quaternary adamantines, there is also an increasing interest in chalcogenide perovskites such as BaZrS 3 and binary chalcogenides like Sb 2 Se 3 . Single crystals of CuGaGeSe 4 , CuAlSnS 4 , BaZrS 3 and Sb 2 Se 3 were grown by chemical vapor transport with iodine as transport agent. The crystal structure of the grown crystals was determined by X-ray diffraction. The chemical composition, measured by XRF, has a significant influence on the crystal structure and the lattice parameters of the materials. The band gap energy of the synthesized semiconductors was determined from diffuse reflectance measured by UV-VIS spectroscopy. References 1. Pamplin, B. (1981): The Adamantine Family of Compounds. - Prog.Cryst.Growth Charact. 3, 179
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