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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, Younghoon; Che, Fanglin; Jo, Jea Woong; Choi, Jongmin; de Arquer, F. Pelayo Garcia; Voznyy, Oleksandr; Sun, Bin; Kim, Junghwan; Choi, Min-Jae; Quintero-Bermudez, Rafael; Fan, Fengjia; Tan, Chih Shan; Bladt, Eva; Walters, Grant; Proppe, Andrew H.; Zou, Chengqin; Yuan, Haifeng; Bals, Sara; Hofkens, Johan; Roeffaers, Maarten B. J.; Hoogland, Sjoerd; Sargent, Edward H.
- DGIST Authors
- Kim, Younghoon; Choi, Jongmin
- Issue Date
- Advanced Materials, 31(17)
- Article Type
- Author Keywords
- colloidal quantum dots; facet-specific passivation; infrared solar cells; narrow bandgap; sodium acetate
- Energy gap; Nanocrystals; Optoelectronic devices; Passivation; Semiconductor quantum dots; Sodium compounds; Solar energy; Solar power generation; Sols; Colloidal nanocrystals; Colloidal quantum dots; External quantum efficiency; Narrow band gap; Photoluminescence quantum yields; Power conversion efficiencies; Sodium acetate; Technological applications; Quantum 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
Chemical & Energy Materials Engineering (CEME) Laboratory
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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