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-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 cm(2)/(V s).
Department of Materials Science and Engineering, ‡Department of Electrical and Systems Engineering, §Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.
Soong Ju
SJ
Oh
Nathaniel E
NE
Berry
Ji-Hyuk
JH
Choi
E Ashley
EA
Gaulding
Hangfei
H
Lin
Taejong
T
Paik
Benjamin T
BT
Diroll
Shin
S
Muramoto
Christopher B
CB
Murray
Cherie R
CR
Kagan