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    Highly Passivated n-Type Colloidal Quantum Dots for Solution-Processed Thermoelectric Generators with Large Output Voltage

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    Type
    Article
    Authors
    Nugraha, Mohamad I.
    Kim, Hyunho
    Sun, Bin
    Desai, Saheena
    de Arquer, F. Pelayo Garcia
    Sargent, Edward H.
    Alshareef, Husam N. cc
    Baran, Derya cc
    KAUST Department
    Functional Nanomaterials and Devices Research Group
    KAUST Solar Center
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    OSR-CRG2018-3737
    Date
    2019-06-26
    Embargo End Date
    2020-06-26
    Permanent link to this record
    http://hdl.handle.net/10754/656057
    
    Metadata
    Show full item record
    Abstract
    Colloidal quantum dots (CQDs) are attractive materials for thermoelectric applications due to their simple and low-cost processing; advantageously, they also offer low thermal conductivity and high Seebeck coefficient. To date, the majority of CQD thermoelectric films reported upon have been p-type, while only a few reports are available on n-type films. High-performing n- and p-type films are essential for thermoelectric generators (TEGs) with large output voltage and power. Here, high-thermoelectric-performance n-type CQD films are reported and showcased in high-performance all-CQD TEGs. By engineering the electronic coupling in the films, a thorough removal of insulating ligands is achieved and this is combined with excellent surface trap passivation. This enables a high thermoelectric power factor of 24 µW m−1 K−2, superior to previously reported n-type lead chalcogenide CQD films operating near room temperature (<1 µW m−1 K−2). As a result, an all-CQD film TEG with a large output voltage of 0.25 V and a power density of 0.63 W m−2 at ∆T = 50 K is demonstrated, which represents an over fourfold enhancement to previously reported p-type only CQD TEGs.
    Citation
    Nugraha, M. I., Kim, H., Sun, B., Desai, S., de Arquer, F. P. G., Sargent, E. H., … Baran, D. (2019). Highly Passivated n-Type Colloidal Quantum Dots for Solution-Processed Thermoelectric Generators with Large Output Voltage. Advanced Energy Materials, 9(28), 1901244. doi:10.1002/aenm.201901244
    Sponsors
    The authors would like to acknowledge Xinwei Guan for supporting XRD measurement. Figures 1a and 6a were created by Heno Hwang, a scientific illustrator at King Abdullah University of Science and Technology (KAUST). This publication is 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
    Wiley
    Journal
    Advanced Energy Materials
    DOI
    10.1002/aenm.201901244
    Additional Links
    http://doi.wiley.com/10.1002/aenm.201901244
    ae974a485f413a2113503eed53cd6c53
    10.1002/aenm.201901244
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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