| Autor: |
Carlos A, López, Carmen, Abia, María Consuelo, Alvarez-Galván, Bo-Kyung, Hong, M Victoria, Martínez-Huerta, Federico, Serrano-Sánchez, Felix, Carrascoso, Andrés, Castellanos-Gómez, M Teresa, Fernández-Díaz, José A, Alonso |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
ACS Omega |
| ISSN: |
2470-1343 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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