title: High-performance quantum-dot solids via elemental sulfur synthesis.
abstract: An elemental-sulfur-based synthesis is reported, which, combined with processing to improve the size dispersion and passivation, results in a low-cost high-quality platform for small-bandgap PbS-CQD-based devices. Size-selective precipitation and cadmium chloride passivation are used to improve the power conversion efficiency of 1 eV bandgap CQD photovoltaic devices dramatically, which leads to record power conversion efficiency for a 1 eV PbS CQD solar cell of 5.4%.
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.
authors.forename: Mingjian
authors.initials: M
authors.lastname: Yuan
authors.forename: Kyle W
authors.initials: KW
authors.lastname: Kemp
authors.forename: Susanna M
authors.initials: SM
authors.lastname: Thon
authors.forename: Jin Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Kang Wei
authors.initials: KW
authors.lastname: Chou
authors.forename: Aram
authors.initials: A
authors.lastname: Amassian
authors.forename: Edward H
authors.initials: EH
authors.lastname: Sargent
keywords: PbS; colloidal quantum dots; depleted heterojunctions; photovoltaics; synthesis