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Advanced Materials

High-Performance Quantum-Dot Solids via Elemental Sulfur Synthesis

Authors

  • Mingjian Yuan,

    1. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
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  • Kyle W. Kemp,

    1. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
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  • Susanna M. Thon,

    1. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
    2. Department of Electrical and Computer Engineering, Johns Hopkins University, Baltimore, Maryland, USA
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  • Jin Young Kim,

    1. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
    2. Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), Seoul, South Korea
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  • Kang Wei Chou,

    1. Physical Sciences and Engineering Division, Solar and Photovoltaic Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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  • Aram Amassian,

    1. Physical Sciences and Engineering Division, Solar and Photovoltaic Engineering Research Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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  • Edward H. Sargent

    Corresponding author
    1. Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada
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Abstract

An elemental-sulfur-based synthesis is reported, which, combined with processing to improve the size dispersion and passivation, results in a low-cost high-quality platform for small-bandgap PbS-CQD-based devices. Size-selective precipitation and cadmium chloride passivation are used to improve the power conversion efficiency of 1 eV bandgap CQD photovoltaic devices dramatically, which leads to record power conversion efficiency for a 1 eV PbS CQD solar cell of 5.4%.

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