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Authors: E. Mellikov, D. Meissner, M. Altosaar, M. Kauk, J. Krustok, A. Öpik, O. Volobujeva, J. Iljina, K. Timmo, I. Klavina, J. Raudoja, M. Grossberg, T. Varema, K. Muska, M. Ganchev, S. Bereznev, M. Danilson

Abstract: This paper reviews results of studies on different materials and technologies for polycrystalline solar cells conducted at Tallinn University of Technology. Structural properties and defect structure of kesterite CZTS compounds (Cu2ZnSnSe4, Cu2ZnSn(SSe)4) were studied. Influence of selenization parameters of a Zn-Cu-Sn stacked layer on the CZTS layer growth and on the morphology, distribution of elements was analyzed. All the results obtained have been used to optimize the technology of producing solar cell structures in different designs. Cu2ZnSnSe4 and, Cu2ZnSn(SSe)4 based monograin layer solar cells were developed.