title: Engineering the surface chemistry of lead chalcogenide nanocrystal solids to enhance carrier mobility and lifetime in optoelectronic devices.
abstract: We introduce a stepwise, hybrid ligand-exchange method for lead chalcogenide nanocrystal (NC) thin films using the compact-inorganic ligand thiocyanate and the short organic ligand benzenediothiolate. Spectroscopic and device measurements show that hybrid exchange enhances both carrier mobility and lifetime in NC thin films. The increased mobility-lifetime product achieved by this method enables demonstration of optoelectronic devices with enhanced power conversion and quantum efficiency.
authors.affiliation: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea.
authors.forename: S J
authors.identifier: http://orcid.org/0000-0003-1434-8844
authors.initials: SJ
authors.lastname: Oh
authors.affiliation: Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: D B
authors.initials: DB
authors.lastname: Straus
authors.affiliation: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: T
authors.initials: T
authors.lastname: Zhao
authors.affiliation: Department of Electrical and System Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. kagan@seas.upenn.edu and Rare Metals Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea.
authors.forename: J-H
authors.initials: JH
authors.lastname: Choi
authors.affiliation: Department of Semiconductor System Engineering, Korea University, Seoul 02841, Republic of Korea.
authors.forename: S-W
authors.initials: SW
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: E A
authors.initials: EA
authors.lastname: Gaulding
authors.affiliation: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
authors.forename: C B
authors.initials: CB
authors.lastname: Murray
authors.affiliation: Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and Department of Electrical and System Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA. kagan@seas.upenn.edu.
authors.forename: C R
authors.initials: CR
authors.lastname: Kagan