Journal
CHEMICAL ENGINEERING JOURNAL
Volume 411, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.128511
Keywords
Nanocrystals; Quasi-2D perovskite; Defect density; Carrier funnelling; Electroluminescence
Categories
Funding
- Macau Science and Technology Development Fund, Macau SAR [FDCT-0044/2020/A1, FDCT-091/2017/A2, FDCT-014/2017/AMJ]
- University of Macau [MYRG2018-00148-IAPME]
- Natural Science Foundation of China [91733302, 61935017, 61904152]
- Natural Science Foundation of Guangdong Province, China [2019A1515012186]
- Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials [2019B121205002]
- China Postdoctoral Science Foundation [2019M653721]
- Department of Physics, Faculty of Science, and Research Committee at the Hong Kong Baptist University
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This work demonstrates the successful fabrication of high-quality quasi-2D perovskite films with high electroluminescence efficiency using a nanocrystals-mediation strategy. The films exhibit uniformly mixed 2D-3D perovskite phases, leading to a threefold increase in electroluminescence efficiency compared with pristine thin films.
Quasi-2D halide perovskites have recently emerged as a promising family of semiconducting materials for light emitting applications. However, these materials usually consist of mixed 2D-3D perovskite phases with rarely controlled distributions when processed into thin films. Such film structures can be detrimental to carrier transport and transfer, limiting the electroluminescent properties and light-emitting device performance. In this work, we tailor the solution crystallization of quasi-2D perovskites with a nanocrystals-mediation strategy, which leads to high-quality, low-defect-density quasi-2D perovskite films with uniformly mixed 2D-3D perovskite phases. Mechanistic insights gained from ultrafast spectroscopic studies reveal a highly enhanced carrier funnelling process in such nanocrystals-mediated films, which results in a threefold increase in the electroluminescence efficiency compared with the pristine thin pristine films. This work demonstrates the promise of a potentially versatile approach in using nanocrystals to manipulate the functional properties of quasi-2D perovskite thin films.
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