Journal
ACS OMEGA
Volume 5, Issue 11, Pages 5931-5938Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b04248
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Funding
- Spanish Ministry of Economy and Competitiveness - FEDER [ENE2014-52158-C2-1-R, MAT2017-84496-R]
- ANPCyT, Argentina [PICT2017-1842, PROICO 2-2016]
- UNSL, Argentina [PICT2017-1842, PROICO 2-2016]
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We present a mechanochemical procedure, with solvent-free, greenchemistry 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.
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