Bidentate chelating ligands as effective passivating materials for perovskite light-emitting diodes
Autor: | Lu Syuan Jhuang, Ping Cheng Chien, Ming Chuan Hsiao, Fang-Chung Chen |
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Rok vydání: | 2019 |
Předmět: |
Steric effects
Materials science Photoluminescence Denticity Passivation General Physics and Astronomy 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Pyridine Chelation Physical and Theoretical Chemistry Thin film 0210 nano-technology Perovskite (structure) |
Zdroj: | Physical Chemistry Chemical Physics. 21:7867-7873 |
ISSN: | 1463-9084 1463-9076 |
DOI: | 10.1039/c8cp07000h |
Popis: | Herein, four pyridine-based chelating ligands, including 1,10-phenanthroline, 4,4′-bipyridine, 4,7-diphenyl-1,10-phenanthroline (Bphen) and pyridine, are used as surface treatment agents for improving the electronic properties of perovskite materials. The results of the steady-state photoluminescence (PL), time resolved PL and hole-only devices made of CH3NH3PbBr3 thin films suggest that the traps are effectively passivated after post-deposition surface treatment with bidentate chelating ligands, including 1,10-phenanthroline and 4,4′-bipyridine. Furthermore, the coordination capability of Bphen was suppressed which is probably due to its two additional phenyl groups, resulting in a steric hindrance effect. When compared with mono-dentate chelating pyridine, bidentate chelating ligands are more active in the current study. Finally, perovskite light-emitting diodes (PeLEDs) are fabricated and the devices exhibit a nearly doubled device efficiency after passivation with 1,10-phenanthroline. It is anticipated that the approach proposed here is a general method for improving the photonic properties of perovskite materials and the device performance of PeLEDs. |
Databáze: | OpenAIRE |
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