Optical Properties, Morphology, and Stability of Iodide-Passivated Lead Sulfide Quantum Dots.

ABSTRACT: Iodide atomic surface passivation of lead chalcogenides has spawned a race in efficiency of quantum dot (QD)-based optoelectronic devices. Further development of QD applications requires a deeper understanding of the passivation mechanisms. In the first part of the current study, we compare optics and electrophysical properties of lead sulfide (PbS) QDs with iodine ligands, obtained from different iodine sources. Methylammonium iodide (MAI), lead iodide (PbI2), and tetrabutylammonium iodide (TBAI) were used as iodine precursors. Using ultraviolet photoelectron spectroscopy, we show that different iodide sources change the QD HOMO/LUMO levels, allowing their fine tuning. AFM measurements suggest that colloidally-passivated QDs result in formation of more uniform thin films in one-step depos

SUBMITTER: Skurlov ID 

PROVIDER: S-EPMC6803903 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature