Silane Network Passivation Through Lead-Sulfur Interaction of X-Type Thiol-Group Ligands for Polar-Resistance and Improved Mobility in Perovskite Quantum Dots

Abstract

The surface ligands of perovskite quantum dots (PQDs) with colloidal properties are critical determinants of quantum efficiency, stability, and surface passivation. However, perovskite structures are sensitive to water and humid environments, which leads to decomposition, and they decisively limit stability through surface ligand and structure control. Herein, an approach using 3-mercaptopropyltrimethoxysilane (MPTMS) among silane materials with the advantages of chemical stability and nontoxicity is proposed. The excellent structural properties of MPTMS are confirmed by the interaction of the Pb-S, which formed an interparticle network through the reaction of the methoxy group bonded to Si. Additionally, fabricated PQDs indicate superior optical performance by suppressing the approach to moisture and acetone solvents. Particularly, silane passivation of the particles conferred hydrophobicity, as confirmed via contact angle and surface energy analysis. Furthermore, silane networks are formed through the MPTMS ligand exchange strategy, suggesting that PQDs are a facile platform for maintaining high quality in aqueous environments.