Ionic Liquid Passivation Eliminates Low-n Quantum Well Domains in Blue Quasi-2D Perovskite Films
Author(s): Zhu, NN (Zhu, Ningning); Xu, KX (Xu, Kaixuan); Xing, J (Xing, Jun); Zhang, J (Zhang, Jun); Dai, JN (Dai, Jiangnan)
Source: ACS APPLIED MATERIALS & INTERFACES Volume: 13 Issue: 48 Pages: 57540-57547 DOI: 10.1021/acsami.1c15879 Published: DEC 8 2021
Abstract: In quasi-two-dimensional (quasi-2D) perovskite films, carriers transport in the cascade structural systems involving various quantum wells (QWs) n, but their efficiency is limited by the severe nonradiative recombination within plentiful n = 1, 2, 3 domains induced by traditional ammonium bromide passivation. Here, we fabricate the quasi-2D films with the elimination of n = 1, 2, 3 domains by introducing the ionic liquid n-butylamine acetate (BAAc) instead of n-butylamine hydrobromide (BABr), which increases the photoluminescence quantum yield (PLQY) and lowers the surface roughness of films. Due to the anion exchange between BAAc and methylamine hydrobromide (MABr), BAAc exhibits a sole passivation effect on methylamine-based perovskites. As a result, the ionic liquid-derived perovskite light-emitting diodes (PeLEDs) display blue emission at 479 nm and show significantly improved performance on external quantum efficiency (EQE) and luminance. Our finding provides insights into the passivating effect of ionic liquid on quasi-2D perovskites and will benefit fabricating PeLEDs with enhanced performance.
Accession Number: WOS:000752970600074
PubMed ID: 34844410
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Xing, Jun 0000-0003-4499-4062
Zhang, Jun 0000-0002-9831-6796
Dai, Jiangnan 0000-0001-9805-8726
ISSN: 1944-8244
eISSN: 1944-8252
