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Cu 2 ZnSnSe 4 : How Far Does Off‐Stoichiometry Go?
Author(s) -
Gurieva Galina,
Ferreira Rafael,
Knoll Philipp,
Schorr Susan
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700957
Subject(s) - stoichiometry , annealing (glass) , crystallite , kesterite , materials science , powder diffraction , diffraction , analytical chemistry (journal) , crystallography , chemical engineering , chemistry , nanotechnology , czts , metallurgy , thin film , optics , chromatography , physics , engineering
Polycrystalline powder samples of eight very far off‐stoichiometric Cu 2 ZnSnSe 4 (CZTSe) compounds (off‐stoichiometry types A–D) are grown using the solid‐state reaction method in evacuated silica tubes. An additional thermal annealing is performed, in order to study the influence of annealing on the phase content and stoichiometry of the CZTSe phases formed under these conditions. The structural characterization of the synthesized materials before as well as after annealing is carried out by powder X‐ray diffraction (PXRD), paying a special attention to the possibility of minimization the content of secondary phases. Wavelength dispersive X‐ray spectroscopy (WDX) is used to determine the chemical composition of the obtained phases, paying a special attention to the phase constituents as well as the evolution of the CZTSe phases after the additional annealing. A comparative study of the phase content of very far off‐stoichiometric CZTSe compounds is presented. The possible limits of the existence region of the kesterite CZTSe are discussed.