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    Ligand-Assisted Reconstruction of Colloidal Quantum Dots Decreases Trap State Density

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    Name:
    Sun Bin_Nano Letter_manu (20200326).pdf
    Size:
    1.788Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2021-03-31
    Download
    Type
    Article
    Authors
    Sun, Bin cc
    Vafaie, Maral
    Levina, Larissa
    Wei, Mingyang
    Dong, Yitong
    Gao, Yajun
    Kung, Hao Ting
    Biondi, Margherita
    Proppe, Andrew H. cc
    Chen, Bin
    Choi, Min-Jae
    Sagar, Laxmi Kishore cc
    Voznyy, Oleksandr cc
    Kelley, Shana O. cc
    Laquai, Frédéric cc
    Lu, Zhenghong cc
    Hoogland, Sjoerd
    García de Arquer, F Pelayo cc
    Sargent, E. cc
    KAUST Department
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-2018-CARF/CCF-3079
    Date
    2020-03-31
    Online Publication Date
    2020-03-31
    Print Publication Date
    2020-05-13
    Embargo End Date
    2021-03-31
    Submitted Date
    2020-02-13
    Permanent link to this record
    http://hdl.handle.net/10754/662456
    
    Metadata
    Show full item record
    Abstract
    Increasing the power conversion efficiency (PCE) of colloidal quantum dot (CQD) solar cells has relied on improving the passivation of CQD surfaces, enhancing CQD coupling and charge transport, and advancing device architecture. The presence of hydroxyl groups on the nanoparticle surface, as well as dimers—fusion between CQDs—has been found to be the major source of trap states, detrimental to optoelectronic properties and device performance. Here, we introduce a CQD reconstruction step that decreases surface hydroxyl groups and dimers simultaneously. We explored the dynamic interaction of charge carriers between band-edge states and trap states in CQDs using time-resolved spectroscopy, showing that trap to ground-state recombination occurs mainly from surface defects in coupled CQD solids passivated using simple metal halides. Using CQD reconstruction, we demonstrate a 60% reduction in trap density and a 25% improvement in charge diffusion length. These translate into a PCE of 12.5% compared to 10.9% for control CQDs.
    Citation
    Sun, B., Vafaie, M., Levina, L., Wei, M., Dong, Y., Gao, Y., … Sargent, E. H. (2020). Ligand-Assisted Reconstruction of Colloidal Quantum Dots Decreases Trap State Density. Nano Letters. doi:10.1021/acs.nanolett.0c00638
    Sponsors
    This work was supported by Ontario Research Fund-Research Excellence program (ORF7 Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7), by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-2018-CRG7-373702 and Award No. OSR-2018-CARF/CCF-3079, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. The authors acknowledge the financial support from QD Solar.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/acs.nanolett.0c00638
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.nanolett.0c00638
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.0c00638
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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