Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 24, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202001816
Keywords
exciton confinement; light-emitting diodes; low-dimension structures; organic-inorganic hybrid perovskites
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Funding
- Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project [JPMJER1305]
- International Institute for Carbon Neutral Energy Research (WPI-I2CNER)
- JSPS KAKENHI [JP15K14149, JP16H04192]
- Canon Foundation
- China Scholarship Council (CSC) [201706730060]
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Quasi-2D metal halide perovskite films are promising for efficient light-emitting diodes (LEDs), because of their efficient radiative recombination and suppressed trap-assisted quenching compared with pure 3D perovskites. However, because of the multidomain polycrystalline nature of solution-processed quasi-2D perovskite films, the composition engineering always impacts the emitting properties with complicated mechanisms. Here, defect passivation and domain distribution of quasi-2D perovskite films prepared with various precursor compositions are systematically studied. As a result, in perovskite films prepared from stoichiometric quasi-2D precursor compositions, large organic ammonium cations function well as passivators. In comparison, precursor compositions of simply adding large organic halide salt into a 3D perovskite precursor ensure not only the defect passivation but also the effective formation of quasi-2D perovskite domains, avoiding unfavorable appearance of low-order domains. Quasi-2D perovskite films fabricated with a well-designed precursor composition achieve a high photoluminescence quantum yield of 95.3% and an external quantum efficiency of 14.7% in LEDs.
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