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A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics

A Facet-Specific Quantum Dot Passivation Strategy for Colloid Management and Efficient Infrared Photovoltaics
Kim, YounghoonChe, FanglinJo, Jea WoongChoi, Jongminde Arquer, F. Pelayo GarciaVoznyy, OleksandrSun, BinKim, JunghwanChoi, Min-JaeQuintero-Bermudez, RafaelFan, FengjiaTan, Chih ShanBladt, EvaWalters, GrantProppe, Andrew H.Zou, ChengqinYuan, HaifengBals, SaraHofkens, JohanRoeffaers, Maarten B. J.Hoogland, SjoerdSargent, Edward H.
DGIST Authors
Kim, YounghoonChoi, Jongmin
Issue Date
Advanced Materials, 31(17)
Article Type
Author Keywords
colloidal quantum dotsfacet-specific passivationinfrared solar cellsnarrow bandgapsodium acetate
Energy gapNanocrystalsOptoelectronic devicesPassivationSemiconductor quantum dotsSodium compoundsSolar energySolar power generationSolsColloidal nanocrystalsColloidal quantum dotsExternal quantum efficiencyNarrow band gapPhotoluminescence quantum yieldsPower conversion efficienciesSodium acetateTechnological applicationsQuantum efficiency
Colloidal nanocrystals combine size- and facet-dependent properties with solution processing. They offer thus a compelling suite of materials for technological applications. Their size- and facet-tunable features are studied in synthesis; however, to exploit their features in optoelectronic devices, it will be essential to translate control over size and facets from the colloid all the way to the film. Larger-diameter colloidal quantum dots (CQDs) offer the attractive possibility of harvesting infrared (IR) solar energy beyond absorption of silicon photovoltaics. These CQDs exhibit facets (nonpolar (100)) undisplayed in small-diameter CQDs; and the materials chemistry of smaller nanocrystals fails consequently to translate to materials for the short-wavelength IR regime. A new colloidal management strategy targeting the passivation of both (100) and (111) facets is demonstrated using distinct choices of cations and anions. The approach leads to narrow-bandgap CQDs with impressive colloidal stability and photoluminescence quantum yield. Photophysical studies confirm a reduction both in Stokes shift (≈47 meV) and Urbach tail (≈29 meV). This approach provides a ≈50% increase in the power conversion efficiency of IR photovoltaics compared to controls, and a ≈70% external quantum efficiency at their excitonic peak. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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
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Division of Energy Technology1. Journal Articles
Department of Energy Science and EngineeringChemical & Energy Materials Engineering (CEME) Laboratory1. Journal Articles

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