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      Synthesis and optoelectronic properties of Cu 3VSe 4 nanocrystals

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          Abstract

          The ternary chalcogenide Cu 3VSe 4 (CVSe) with sulvanite structure has been theoretically predicted to be a promising candidate for photovoltaic applications due to its suitable bandgap for solar absorption and the relatively earth-abundant elements in its composition. To realize the absorber layer via an inexpensive route, printed thin-films could be fabricated from dispersions of nano-sized Cu 3VSe 4 precursors. Herein, cubic Cu 3VSe 4 nanocrystals were successfully synthesized via a hot-injection method. Similar with reported Cu 3VS 4 nanocrystals, Cu 3VSe 4 nanocrystals with cubic structure exhibit three absorption bands in the UV-Visible range indicative of a potential intermediate bandgap existence. A thin film fabricated by depositing the nanoparticles Cu 3VSe 4 on FTO coated glass substrate, exhibited a p-type behavior and a photocurrent of ~ 4 μA/cm 2 when measured in an electrochemical cell setting. This first demonstration of photocurrent exhibited by a CVSe nanocrystals thin film signifies a promising potential in photovoltaic applications.

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          Solar conversion efficiency of photovoltaic and photoelectrolysis cells with carrier multiplication absorbers

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            Metal-free inorganic ligands for colloidal nanocrystals: S2-, HS-, Se2-, HSe-, Te2-, HTe-, TeS3(2-), OH-, and NH2- as surface ligands.

            All-inorganic colloidal nanocrystals were synthesized by replacing organic capping ligands on chemically synthesized nanocrystals with metal-free inorganic ions such as S(2-), HS(-), Se(2-), HSe(-), Te(2-), HTe(-), TeS(3)(2-), OH(-) and NH(2)(-). These simple ligands adhered to the NC surface and provided colloidal stability in polar solvents. The versatility of such ligand exchange has been demonstrated for various semiconductor and metal nanocrystals of different size and shape. We showed that the key aspects of Pearson's hard and soft acids and bases (HSAB) principle, originally developed for metal coordination compounds, can be applied to the bonding of molecular species to the nanocrystal surface. The use of small inorganic ligands instead of traditional ligands with long hydrocarbon tails facilitated the charge transport between individual nanocrystals and opened up interesting opportunities for device integration of colloidal nanostructures.
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              Understanding intermediate-band solar cells

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                Author and article information

                Contributors
                Role: ConceptualizationRole: MethodologyRole: Writing – original draftRole: Writing – review & editing
                Role: ConceptualizationRole: Formal analysisRole: Funding acquisitionRole: Project administrationRole: SupervisionRole: Writing – original draftRole: Writing – review & editing
                Role: MethodologyRole: Writing – review & editing
                Role: ConceptualizationRole: Funding acquisitionRole: SupervisionRole: Writing – original draftRole: Writing – review & editing
                Role: Editor
                Journal
                PLoS One
                PLoS ONE
                plos
                plosone
                PLoS ONE
                Public Library of Science (San Francisco, CA USA )
                1932-6203
                5 May 2020
                2020
                : 15
                : 5
                : e0232184
                Affiliations
                [1 ] Department of Mechanical and Materials Engineering, Florida International University, College of Engineering and Computing, Miami, Florida, United States of America
                [2 ] Institute National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, Varennes, Québec, Canada
                [3 ] Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu, PR China
                [4 ] Department of Materials Science and Engineering, University of Delaware, Newark, Delaware, United States of America
                University of Salento, ITALY
                Author notes

                Competing Interests: The authors have declared that no competing interests exist.

                Author information
                http://orcid.org/0000-0001-6833-5825
                Article
                PONE-D-20-01270
                10.1371/journal.pone.0232184
                7199925
                32369508
                382c2d0b-cd19-44ec-beba-343531d76258
                © 2020 Liu et al

                This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

                History
                : 15 January 2020
                : 8 April 2020
                Page count
                Figures: 6, Tables: 0, Pages: 11
                Funding
                Funded by: funder-id http://dx.doi.org/10.13039/100000104, National Aeronautics and Space Administration;
                Award ID: 80NSSC19M0201
                Award Recipient :
                Funded by: National Science Foundation (US)
                Award ID: NSF 1924412
                Award Recipient :
                ML Funding from D.Radu FIU startup funds; DR and CYL National Aeronautics and Space Administration, 80NSSC19M0201, https://www.nasa.gov The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript CYL National Science Foundation Grant No. 1924412 https://www.nsf.gov The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
                Categories
                Research Article
                Physical Sciences
                Materials Science
                Materials
                Thin Films
                Physical Sciences
                Materials Science
                Materials
                Crystals
                Nanocrystals
                Physical Sciences
                Materials Science
                Materials
                Nanomaterials
                Nanocrystals
                Engineering and Technology
                Nanotechnology
                Nanomaterials
                Nanocrystals
                Engineering and Technology
                Energy and Power
                Alternative Energy
                Photovoltaic Power
                Physical Sciences
                Materials Science
                Materials
                Semiconductors
                Physical Sciences
                Chemistry
                Chemical Compounds
                Organic Compounds
                Alcohols
                Ethanol
                Physical Sciences
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                Organic Chemistry
                Organic Compounds
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                Ethanol
                Physical Sciences
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                Research and Analysis Methods
                Spectrum Analysis Techniques
                Electron Beam Spectrum Analysis Techniques
                X-Ray Photoelectron Spectroscopy
                Physical Sciences
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