Designing High-Performance PbS and PbSe Nanocrystal Electronic Devices through Stepwise, Post-Synthesis, Colloidal Atomic Layer Deposition

Authors:
  • NBNathaniel E. Berry
    Nathaniel E. Berry
  • EGE. Ashley Gaulding
    E. Ashley Gaulding
  • HLHangfei Lin
    Hangfei Lin
  • TPTaejong Paik
    Taejong Paik
  • BDBenjamin. T. Diroll
    Benjamin. T. Diroll
  • CMChristopher B. Murray
    Christopher B. Murray
  • CKCherie R. Kagan
    Cherie R. Kagan
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Abstract
We report a simple, solution-based, postsynthetic colloidal, atomic layer deposition (PS-cALD) process to engineer stepwise the surface stoichiometry and therefore the electronic properties of lead chalcogenide nanocrystal (NC) thin films integrated in devices. We found that unlike chalcogen-enriched NC surfaces that are structurally, optically, and electronically unstable, lead chloride treatment creates a well-passivated shell that stabilizes the NCs. Using PS-cALD of lead chalcogenide NC thin films we demonstrate high electron field-effect mobilities of ∼4.5 cm2/(V s).

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