Great attention has been devoted to the preparation and characterization of organic-inorganic hybrid perovskites (OIHs). These advanced materials can provide low cost materials for self assembly quantum well applications, fuel, solar cells, batteries, electronic and optoelectronic applications. Diammonium halide perovskite hybrids [NH3(CH2)nNH3]MClxBr4-x ; x= 0, 2, 4; M= Co, Mn, Cu allow mixing of organic and inorganic components in one molecule which possesses a property that may not exist in either of the parent components. Possibilities could elaborate hybrid materials in terms of processing new chemical and physical properties according to the application needed. Single crystals were prepared by slow evaporation. The complete structure information as well as lattice parameters for Co hybrid n= 4-5 are provided, and n = 5 - 6 for Mn hybrid. Differential thermal analysis DSC shows reversible solid-solid phase transition for both the Co and Mn hybrids. Permittivity studies confirm the phase transition. FTIR at different temperature are discussed. Electronic structure and chemical bonding in Co, Mn OIHs were studied by X-ray (XPS) photoemission spectroscopy. All elements of Co and Mn organic-inorganic hybrid perovskites were found in XPS spectra and can be related to the peaks of N1s, C1s, Co2p, Mn2p and Cl2p. Wide peak of C1s spectra was related to the chemically unequivalent C atoms in the compounds. The spectrum of the N1s level with binding energies of 401.2 eV was assigned to NH3-group. The analysis of Co2p states in Co OIHs compounds shows the divalent state of Co with a typical satellite structure.
Acknowledgment ASRT-Hungarian Academy of science funding.
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