In Situ Inorganic Ligand Replenishment Enables Bandgap Stability in Mixed-Halide Perovskite Quantum Dot Solids

Détails bibliographiques
Publié dans:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 21 vom: 30. Mai, Seite e2200854
Auteur principal:	Wang, Ya-Kun (Auteur)
Autres auteurs:	Singh, Kamalpreet, Li, Jiao-Yang, Dong, Yitong, Wang, Xue-Qi, Pina, Joao M, Yu, You-Jun, Sabatini, Randy, Liu, Yang, Ma, Dongxin, Liu, Jun, Liu, Zeke, Gao, Yiyuan, Voznyy, Oleksandr, Ma, Wanli, Fung, Man-Keung, Liao, Liang-Sheng, Sargent, Edward H
Format:	Article en ligne
Langue:	English
Publié:	2022
Accès à la collection:	Advanced materials (Deerfield Beach, Fla.)
Sujets:	Journal Article bandgap stability in situ ligand exchange mixed-halide perovskites operational stability perovskite LEDs

Description
Résumé:	© 2022 Wiley-VCH GmbH. Instability in mixed-halide perovskites (MHPs) is a key issue limiting perovskite solar cells and light-emitting diodes (LEDs). One form of instability arises during the processing of MHP quantum dots using an antisolvent to precipitate and purify the dots forming surface traps that lead to decreased luminescence, compromised colloidal stability, and emission broadening. Here, the introduction of inorganic ligands in the antisolvents used in dot purification is reported in order to overcome this problem. MHPs that are colloidally stable for over 1 year at 25 °C and 40% humidity are demonstrated and films that are stable under 100 W cm-2 photoirradiation, 4× longer than the best previously reported MHPs, are reported. In LEDs, the materials enable an EQE of 24.4% (average 22.5 ± 1.3%) and narrow emission (full-width at half maximum of 30 nm). Sixfold-enhanced operating stability relative to the most stable prior red perovskite LEDs having external quantum efficiency >20% is reported
Description:	Date Revised 26.05.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202200854