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

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-enriche...

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Bibliographic Details
Published in:Nano letters 2014-03, Vol.14 (3), p.1559-1566
Main Authors: Oh, Soong Ju, Berry, Nathaniel E, Choi, Ji-Hyuk, Gaulding, E. Ashley, Lin, Hangfei, Paik, Taejong, Diroll, Benjamin. T, Muramoto, Shin, Murray, Christopher B, Kagan, Cherie R
Format: Article
Language:English
Subjects:
Chalcogenides
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Deposition
Devices
Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Lead chlorides
Materials science
Nanocrystalline materials
Nanocrystals
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Physics
Stoichiometry
Thin films
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Summary: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).
ISSN:1530-6984
1530-6992
DOI:10.1021/nl404818z