Mechano-Chemical Synthesis, Structural Features and Optical Gap of Hybrid CH3NH3CdBr3 Perovskite

JOSÉ ANTONIO ALONSO; PAULA KAYSER; BO-KYUNG HONG; MARÍA CONSUELO ÁLVAREZ-GALVÁN; FRANCOIS FAUTH; CARLOS ALBERTO LÓPEZ

Materials

MDPI

Lugar: Basilea; Año: 2021 vol. 14

1996-1944

Hybrid methyl-ammonium (MA:CH3NH3+) lead halide MAPbX3 (X = halogen) perovskitesexhibit an attractive optoelectronic performance that can be applied to the next generation of solarcells. To extend the field of interest of these hybrid materials, we describe the synthesis by a solventfree 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 ina framework defined in the Cmc21 (No 36) space group. The details of the structural arrangementat 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 beuseful for ultraviolet detectors.