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Materials 2015, 8(4), 1858-1870; doi:10.3390/ma8041858

Impact of Different Surface Ligands on the Optical Properties of PbS Quantum Dot Solids

1
Alphasense, Inc., 510 Philadelphia Pike, Wilmington, DE 19809, USA
2
Department of Electrical and Computer Engineering, University of Delaware, 140 Evans Hall, Newark, DE 19716, USA
3
Department of Materials Science and Engineering, University of Delaware, 201 DuPont Hall, Newark, DE 19716, USA
4
Technologie Supérieure, 1100 rue Notre-Dame Ouest, Montréal, QC H3C 0J9, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Dirk Poelman
Received: 12 February 2015 / Revised: 7 April 2015 / Accepted: 9 April 2015 / Published: 21 April 2015
(This article belongs to the Special Issue Luminescent Materials and Devices)
View Full-Text   |   Download PDF [2858 KB, uploaded 21 April 2015]   |  

Abstract

The engineering of quantum dot solids with low defect concentrations and efficient carrier transport through a ligand strategy is crucial to achieve efficient quantum dot (QD) optoelectronic devices. Here, we study the consequences of various surface ligand treatments on the light emission properties of PbS quantum dot films using 1,3-benzenedithiol (1,3-BDT), 1,2-ethanedithiol (EDT), mercaptocarboxylic acids (MPA) and ammonium sulfide ((NH4)2S). We first investigate the influence of different ligand treatments on the inter-dot separation, which mainly determines the conductivity of the QD films. Then, through a combination of photoluminescence and transient photoluminescence characterization, we demonstrate that the radiative and non-radiative recombination mechanisms in the quantum dot films depend critically on the length and chemical structure of the surface ligands. View Full-Text
Keywords: quantum dots; PbS; lead chalcogenide; surface ligand; EDT; 1,3-BDT; MPA; ammonium sulfide; photo-luminescence quantum dots; PbS; lead chalcogenide; surface ligand; EDT; 1,3-BDT; MPA; ammonium sulfide; photo-luminescence
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Xu, F.; Gerlein, L.F.; Ma, X.; Haughn, C.R.; Doty, M.F.; Cloutier, S.G. Impact of Different Surface Ligands on the Optical Properties of PbS Quantum Dot Solids. Materials 2015, 8, 1858-1870.

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