Mechano-Chemical Synthesis, Structural Features and Optical Gap of Hybrid CH<sub>3</sub>NH<sub>3</sub>CdBr<sub>3</sub> Perovskite
José Antonio Alonso,
Paula Kayser,
Bo-Kyung Hong,
María Consuelo Álvarez-Galván,
Francois Fauth,
Carlos Alberto López
Affiliations
José Antonio Alonso
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
Paula Kayser
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
Bo-Kyung Hong
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
María Consuelo Álvarez-Galván
Instituto de Catálisis y Petroleoquímica, Consejo Superior de Investigaciones Científicas, Cantoblanco, 28049 Madrid, Spain
Francois Fauth
CELLS—ALBA Synchrotron Light Facility, Cerdanyola del Valles, E-08290 Barcelona, Spain
Carlos Alberto López
Instituto de Investigación en Tecnología Química (UNSL-CONICET), Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, Almirante Brown 1455, San Luis 5700, Argentina
Hybrid methyl-ammonium (MA:CH3NH3+) lead halide MAPbX3 (X = halogen) perovskites exhibit an attractive optoelectronic performance that can be applied to the next generation of solar cells. To extend the field of interest of these hybrid materials, we describe the synthesis by a solvent-free ball-milling procedure, yielding a well crystallized, pure and moisture stable specimen of the Cd tribromide counterpart, MACdBr3, which contains chains of face-sharing CdBr6 octahedra in a framework defined in the Cmc21 (No 36) space group. The details of the structural arrangement at 295 K have been investigated by high angular resolution synchrotron x-ray diffraction (SXRD), including the orientation of the organic MA units, which are roughly aligned along the c direction, given the acentric nature of the space group. UV-vis spectra unveil a gap of 4.6 eV, which could be useful for ultraviolet detectors.