Designing High-Performance PbS and PbSe Nanocrystal\nElectronic Devices through Stepwise, Post-Synthesis, Colloidal Atomic\nLayer Deposition

Abstract

We\nreport a simple, solution-based, postsynthetic colloidal, atomic\nlayer deposition (PS-cALD) process to engineer stepwise the surface\nstoichiometry and therefore the electronic properties of lead chalcogenide\nnanocrystal (NC) thin films integrated in devices. We found that unlike\nchalcogen-enriched NC surfaces that are structurally, optically, and\nelectronically unstable, lead chloride treatment creates a well-passivated\nshell that stabilizes the NCs. Using PS-cALD of lead chalcogenide\nNC thin films we demonstrate high electron field-effect mobilities\nof ∼4.5 cm²/(V s).