Pb–S coordination-assisted in situ ligand engineering of CsPbBr 3 nanocrystals using (3-mercaptopropyl)methyldimethoxysilane for enhanced robustness and optoelectronic properties

ions, effectively passivating surface defects. Treatment with the MPMDMS additive enhanced the photoluminescence intensity, carrier lifetime, and QY, while providing exceptional stability under ambient air, water exposure, and elevated temperatures. Electron-only device measurements revealed up to a threefold increase in electron mobility and more than a twofold reduction in trap density compared with untreated controls. These findings establish MPMDMS as a versatile additive that improves optical and electronic properties while ensuring environmental robustness, laying the foundation for high-performance perovskite-based optoelectronic devices.