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    Micron Thick Colloidal Quantum Dot Solids

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    Name:
    blade_PDF_Proof_MS (1).pdf
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    Format:
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    Description:
    Accepted manuscript
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    blade_PDF_Proof_SI.pdf
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    Type
    Article
    Authors
    Fan, James Z. cc
    Vafaie, Maral cc
    Bertens, Koen
    Sytnyk, Mykhailo
    Pina, Joao M. cc
    Sagar, Laxmi Kishore cc
    Ouellette, Olivier cc
    Proppe, Andrew H. cc
    Rasouli, Armin Sedighian
    Gao, Yajun
    Baek, Se-Woong
    Chen, Bin
    Laquai, Frédéric cc
    Hoogland, Sjoerd
    García de Arquer, F Pelayo cc
    Heiss, Wolfgang cc
    Sargent, E. cc
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Material Science and Engineering Program
    KAUST Solar Center (KSC)
    KAUST Grant Number
    CRG2018-3737.
    Date
    2020-06-16
    Online Publication Date
    2020-06-16
    Print Publication Date
    2020-07-08
    Embargo End Date
    2021-06-16
    Submitted Date
    2020-04-14
    Permanent link to this record
    http://hdl.handle.net/10754/663783
    
    Metadata
    Show full item record
    Abstract
    Shortwave infrared colloidal quantum dots (SWIRCQDs) are semiconductors capable of harvesting across the AM1.5G solar spectrum. Today’s SWIR-CQD solar cells rely on spin-coating; however, these films exhibit cracking once thickness exceeds ∼500 nm. We posited that a blade-coating strategy could enable thick QD films. We developed a ligand exchange with an additional resolvation step that enabled the dispersion of SWIRCQDs. We then engineered a quaternary ink that combined highviscosity solvents with short QD stabilizing ligands. This ink, bladecoated over a mild heating bed, formed micron-thick SWIR-CQD films. These SWIR-CQD solar cells achieved short-circuit current densities (Jsc) that reach 39 mA cm−2 , corresponding to the harvest of 60% of total photons incident under AM1.5G illumination. External quantum efficiency measurements reveal both the first exciton peak and the closest Fabry−Perot resonance peak reaching approximately 80%this is the highest unbiased EQE reported beyond 1400 nm in a solution-processed semiconductor.
    Citation
    Fan, J. Z., Vafaie, M., Bertens, K., Sytnyk, M., Pina, J. M., Sagar, L. K., … Sargent, E. H. (2020). Micron Thick Colloidal Quantum Dot Solids. Nano Letters. doi:10.1021/acs.nanolett.0c01614
    Sponsors
    The authors thank L. Levina, E. Palmiano, R. Wolowiec, and D. Kopilovic for their assistance during the period of study. The authors also thank the members of QD Solar for their assistance and discussions during the period of study: V. Tran, T. Vo, T. Gibbs, M. Labine, A. MacDonald, E. Mosaferi, R. Quintero-Bermudez, and A. Fisher.
    This work was supported by Ontario Research Fund-Research Excellence program (ORF7 ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7) and by the Natural Sciences and Engineering Research Council (NSERC) of Canada in the form of Alexander Graham Bell Canada Graduate Scholarships (CGS-D), Materials for Enhanced Energy Technologies (MEET) scholarships, and the NSERC Collaborative Research and Training Experience (CREATE) Program Grant Number 466083. The authors acknowledge financial support from QD Solar. This publication is also based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award No. OSR-CRG2018-3737.
    Publisher
    American Chemical Society (ACS)
    Journal
    Nano Letters
    DOI
    10.1021/acs.nanolett.0c01614
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.nanolett.0c01614
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.nanolett.0c01614
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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