Harnessing Pb-S Interactions for Long-Term Water Stability in Cesium Lead Halide Perovskite Nanocrystals.

Autor: Ahlawat M; Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India., Sahu A; Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.; Department of Chemical Sciences, Indian Institute of Science Education and Research Berhampur, Berhampur, 760010, India., Govind Rao V; Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Aug; Vol. 20 (35), pp. e2401326. Date of Electronic Publication: 2024 Apr 16.
DOI: 10.1002/smll.202401326
Abstrakt: Lead halide perovskite nanocrystals (LHP NCs) have garnered attention as promising light-harvesting materials for optoelectronics and photovoltaic devices, attributed to their impressive optoelectronic properties. However, their susceptibility to moisture-induced degradation has hindered their practical applications. Despite various encapsulation strategies, challenges persist in maintaining their stability and optoelectronic performance simultaneously. Here, a ligand exchange approach is proposed using (11-mercaptoundecyl)-N,N,N-trimethylammonium bromide (MUTAB) to enhance the stability and dispersibility of CsPbBr 3 (CPB) NCs in aqueous environments. MUTAB enables effective surface passivation of the CPB NCs via robust Pb-S interactions at the S-terminal while concurrently directing water molecules through the unbound cationic N-terminal or vice versa, ensuring water dispersibility and stability. Spectroscopic analysis confirms retained structural and optical integrity post-ligand exchange. Crucially, MUTAB-bound CPB NCs exhibit sustained charge transfer properties, demonstrated by aqueous colloidal oxidation reactions. This ligand exchange strategy offers a promising pathway for advancing LHP NCs toward practical optoelectronic and photocatalytic applications.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
Externí odkaz: