Evolution of the Dynamics of As-Deposited and Annealed Lead Halide Perovskites
| Autor: | Mopelola A. Idowu, Oleg Varnavski, Theodore Goodson, Sung Hei Yau |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Materials science Absorption spectroscopy Trihalide Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Crystallinity Chemical physics Quantum dot Condensed Matter::Superconductivity Electrical and Electronic Engineering 0210 nano-technology Absorption (electromagnetic radiation) Biotechnology Perovskite (structure) |
| Zdroj: | ACS Photonics. 4:1195-1206 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.7b00095 |
| Popis: | The rapid rise of organolead trihalide perovskites as solar photovoltaic materials has been followed by promising developments in light-emitting devices and lasers due to their unique and promising optical properties. Evolution of the photophysical properties in as-deposited or annealed CH3NH3PbBr3 and CH3NH3PbI3 perovskite films processed through the interdiffusion method has been investigated. Absorption spectra showed broad band edge saturation in the as-deposited films in contrast to sharp excitonic absorption in the annealed films. Fluorescence emission of the perovskite films showed strong dependence on the halogen type with a very high quantum yield of ∼90% for the annealed CH3NH3PbBr3 film. An explanation for this was provided based on its crystallinity and quantum confinement of the excitons. The emission showed weakly Stokes shifted bands. Time-resolved spectroscopic measurements were carried out to probe the ultrafast dynamics for the perovskites for the as-deposited or annealed films. We class... |
| Databáze: | OpenAIRE |
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