Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6
| Autor: | Aron Walsh, Ji-Sang Park, Sung-Hyun Kim, Lucy D. Whalley, Young-Kwang Jung, Joaquín Calbo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Exciton Doping Fermi level 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Molecular physics Ion symbols.namesake Stokes shift symbols General Materials Science 0210 nano-technology Luminescence Absorption (electromagnetic radiation) Perovskite (structure) |
| Zdroj: | Journal of Materials Chemistry A. 7:20254-20261 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | Cs4PbBr6 is a member of the extended halide perovskite family that is built from isolated (zero-dimensional) PbBr64− octahedra with Cs+ counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310–375 nm) with efficient luminescence in the green region (∼540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs4PbBr6. We find a heavily compensated system where the room-temperature carrier concentrations ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|