info:eu-repo/semantics/article
Crystal Structure Features of CsPbBr3 Perovskite Prepared by Mechanochemical Synthesis
Fecha
2020-03Registro en:
Lopez, Carlos Alberto; Abia, Carmen; Alvarez Galván, María Consuelo; Hong, Bo Kyung; Martínez Huerta, M. Victoria; et al.; Crystal Structure Features of CsPbBr3 Perovskite Prepared by Mechanochemical Synthesis; American Chemical Society; ACS Omega; 5; 11; 3-2020; 5931-5938
2470-1343
2470-1343
CONICET Digital
CONICET
Autor
Lopez, Carlos Alberto
Abia, Carmen
Alvarez Galván, María Consuelo
Hong, Bo Kyung
Martínez Huerta, M. Victoria
Serrano Sánchez, Federico
Carrascoso, Felix
Castellanos Gómez, Andrés
Fernández Díaz, M. Teresa
Alonso, José A.
Resumen
We present a mechanochemical procedure, with solvent-free, green-chemistry credentials, to grow all-inorganic CsPbBr3 perovskite. The crystal structure of this perovskite and its correlations with the physicochemical properties have been studied. Synchrotron X-ray diffraction (SXRD) and neutron powder diffraction (NPD) allowed us to follow the crystallographic behavior from 4 to 773 K. Unreported features like the observed negative thermal expansion of the b unit-cell parameter stem from octahedral distortions in the 4-100 K temperature range. The mechanochemical synthesis was designed to reduce the impact energy during the milling process, leading to a defect-free, well-crystallized sample characterized by a minimum unit-cell volume and octahedral tilting angles in the low-temperature orthorhombic perovskite framework, defined in the Pbnm space group. The UV-vis diffuse reflectance spectrum shows a reduced band gap of 2.22(3) eV, and the photocurrent characterization in a photodetector reveals excellent properties with potential applications of this material in optoelectronic devices.