Understanding the Formation of Vertical Orientation in Two-dimensional Metal Halide Perovskite Thin Films
| Autor: | Depei Zhang, Seunghun Lee, Gaurav Giri, Alexander Z. Chen, Michelle Shiu, Mustafa Mahmoud, Joshua J. Choi, Benjamin Foley, Xiaoyu Deng |
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| Rok vydání: | 2019 |
| Předmět: |
Supersaturation
Materials science General Chemical Engineering Nucleation Halide Crystal growth 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Chemical physics law Electrode Materials Chemistry Thin film Crystallization 0210 nano-technology Perovskite (structure) |
| Zdroj: | Chemistry of Materials. 31:1336-1343 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/acs.chemmater.8b04531 |
| Popis: | Metal halide perovskites have demonstrated strong potential for optoelectronic applications. Particularly, two-dimensional (2D) perovskites have emerged to be promising materials due to their tunable properties and superior stability compared to their three-dimensional counterparts. For high device performance, 2D perovskites need a vertical crystallographic orientation with respect to the electrodes to achieve efficient charge transport. However, the vertical orientation is difficult to achieve with various compositions due to a lack of understanding of the thin film nucleation and growth processes. Here we report a general crystallization mechanism for 2D perovskites, where solvent evaporation and crystal growth compete to influence the level of supersaturation and a low supersaturation is necessary to crystallize vertically oriented thin films starting from nucleation at the liquid–air interface. Factors influencing the supersaturation and crystallization dynamics, such as choices of organic spacers, s... |
| Databáze: | OpenAIRE |
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