N-Butylamine surface treatment to decompose ligands and 2D self-assembled controlled connected-nanocrystals arrays

摘要

Colloidal quantum dots (QDs) are promising materials for photovoltaic and diode application due to their size-dependent bandgap and full energy spectrum. Herein; we demonstrate a novel strategy to realize inorganic ligand exchange on PbS nanocrystals selectively through ligand decomposition under room temperature without damage to nanocrystals, introduction of S2- to form sulfur-connected PbS QDs enables highly oriented 2D QDs arrays and evenly distributed morphology [1,2]. Finally bromide and Sulfur hybrid-capped QDs realized enhanced carrier mobility significantly measured by Hall Effect.