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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, Young HoonChoi, JongminArquer, F. Pelayo García deWalters, GrantSun, BinOuellette, OlivierKim, JunghwanProppe, Andrew H.Bermudez, Rafael QuinteroFan, JamesXu, JixianTan, Chih ShanVoznyy, OleksandrSargent, Edward H.
DGIST Authors
Kim, Young Hoon
Issue Date
2017-11
Citation
Advanced Materials, 29(43)
Type
Article
Article Type
Article
Keywords
Colloidal Quantum DotsEnergy DisorderLigand ExchangesLigandsMonodispersityNanocrystalsOpen Circuit VoltageOpen-Circuit VoltagePhotovoltaicsPolydispersityPower Conversion EfficienciesReactive SpeciesSemiconductor Quantum DotsSolar CellsSolar Control FilmsSolution PhaseSolution-Phase Ligand ExchangeTiming Circuits
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
Files:
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Collection:
Convergence Research Center for Solar Energy1. Journal Articles


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