Cited 11 time in webofscience Cited 14 time in scopus

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 HoonChoi, Jongmin
Issue Date
2017-11
Citation
Advanced Materials, 29(43)
Type
Article
Article Type
Article
Author Keywords
Colloidal quantum dotsOpen-circuit voltagePhotovoltaicsPolydispersitySolution-phase ligand exchange
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
Files:
There are no files associated with this item.
Collection:
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles
Convergence Research Center for Solar Energy1. Journal Articles


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