Supercritical fluid-assisted crystallization of CH3NH3PbI3 perovskite films
| Autor: | Jeremy Pascucci, Dmitry Pestov, Gilbert Annohene, Gary Tepper |
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| Rok vydání: | 2020 |
| Předmět: |
Supercritical carbon dioxide
Materials science General Chemical Engineering Solvation 02 engineering and technology Crystal structure 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Supercritical fluid 0104 chemical sciences law.invention Chemical engineering law Deposition (phase transition) Physical and Theoretical Chemistry Crystallization Thin film 0210 nano-technology Perovskite (structure) |
| Zdroj: | The Journal of Supercritical Fluids. 156:104684 |
| ISSN: | 0896-8446 |
| Popis: | Crystallization of CH3NH3PbI3 perovskite films was performed in supercritical carbon dioxide with and without organic cosolvents. Post deposition crystallization of the films was performed in a binary, single phase supercritical fluid at constant conditions (45 ℃ , 1200 psi) but with varying cosolvent volume fractions up to 2 %. Organic cosolvents with varying polarity, propensity for hydrogen bonding and strength of solvation were used and the resulting perovskite film morphology, crystal structure and optical absorption spectra were measured. It was determined that the cosolvents can provide selective interactions with one or both of the perovskite precursor compounds resulting in different film morphologies ranging from uniform films containing large grains to films exhibiting large cubic or hexagonal crystals or preferential crystallographic orientations. The use of supercritical fluids to enhance or tune crystallization in solid-state thin films could have broad applications toward the realization of high efficiency photovoltaic devices. |
| Databáze: | OpenAIRE |
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