High-performance quantum-dot solids via elemental sulfur synthesis

Mingjian Yuan; Kyle W Kemp; Susanna M Thon; Jin Young Kim; Kang Wei Chou; Aram Amassian; Edward H Sargent

doi:10.1002/adma.201305912

High-performance quantum-dot solids via elemental sulfur synthesis

Adv Mater. 2014 Jun 4;26(21):3513-9. doi: 10.1002/adma.201305912. Epub 2014 Mar 21.

Authors

Mingjian Yuan¹, Kyle W Kemp, Susanna M Thon, Jin Young Kim, Kang Wei Chou, Aram Amassian, Edward H Sargent

Affiliation

¹ Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada.

PMID: 24659303
DOI: 10.1002/adma.201305912

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%.

Keywords: PbS; colloidal quantum dots; depleted heterojunctions; photovoltaics; synthesis.

Publication types

Research Support, Non-U.S. Gov't