Tetrafluoroborate?Induced Reduction in Defect Density in Hybrid Perovskites through Halide Management
نویسندگان
چکیده
Hybrid-perovskite-based optoelectronic devices are demonstrating unprecedented growth in performance, and defect passivation approaches highly promising routes to further improve properties. Here, the effect of molecular ion BF4?, introduced via methylammonium tetrafluoroborate (MABF4) a surface treatment for MAPbI3 perovskite, is reported. Optical spectroscopy characterization shows that introduction leads reduced non-radiative charge-carrier recombination with reduction first-order rate from 6.5 × 106 2.5 105 s?1 BF4?-treated samples, consequent increase photoluminescence quantum yield by an order magnitude (from 0.5 10.4%). 19F, 11B, 14N solid-state NMR used elucidate atomic-level mechanism BF4? additive-induced improvements, revealing acts as scavenger excess MAI forming MAI–MABF4 cocrystals. This shifts equilibrium iodide concentration perovskite phase, thereby reducing interstitial defects act deep traps centers. These collective results allow us microscopic action BF4?.
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ژورنال
عنوان ژورنال: Advanced Materials
سال: 2021
ISSN: ['1521-4095', '0935-9648']
DOI: https://doi.org/10.1002/adma.202102462