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Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange

Title
Enhanced Open-Circuit Voltage in Colloidal Quantum Dot Photovoltaics via Reactivity-Controlled Solution-Phase Ligand Exchange
Authors
Jo, Jea WoongKim, YounghoonChoi, Jongminde Arquer, F. Pelayo GarcíaWalters, GrantSun, BinOuellette, OlivierKim, JunghwanProppe, Andrew H.Quintero-Bermudez, RafaelFan, JamesXu, JixianTan, Chih ShanVoznyy, OleksandrSargent, Edward H.
DGIST Authors
Kim, YounghoonChoi, Jongmin
Issue Date
2017-11
Citation
Advanced Materials, 29(43)
Type
Article
Article Type
Article
Author Keywords
colloidal quantum dotsopen-circuit voltagephotovoltaicspoly-dispersitysolution-phase ligand exchange
Keywords
LIGHT-EMITTING-DIODESSOLAR-CELLSSOLIDSNANOCRYSTALSPASSIVATIONARCHITECTUREPERFORMANCEABSORPTIONDEFICITINKS
ISSN
0935-9648
Abstract
The energy disorder that arises from colloidal quantum dot (CQD) polydispersity limits the open-circuit voltage (VOC) and efficiency of CQD photovoltaics. This energy broadening is significantly deteriorated today during CQD ligand exchange and film assembly. Here, a new solution-phase ligand exchange that, via judicious incorporation of reactivity-engineered additives, provides improved monodispersity in final CQD films is reported. It has been found that increasing the concentration of the less reactive species prevents CQD fusion and etching. As a result, CQD solar cells with a VOC of 0.7 V (vs 0.61 V for the control) for CQD films with exciton peak at 1.28 eV and a power conversion efficiency of 10.9% (vs 10.1% for the control) is achieved. © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
URI
http://hdl.handle.net/20.500.11750/4743
DOI
10.1002/adma.201703627
Publisher
Wiley-VCH Verlag
Related Researcher
  • Author Choi, Jongmin Chemical & Energy Materials Engineering (CEME) Laboratory
  • Research Interests Advanced Metal Oxides; Colloidal Quantum Dots; Perovskite-Quantum Dot Hybrid Nanomaterials; Photocatalytic Materials
Files:
There are no files associated with this item.
Collection:
Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles


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