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    Dopant-Assisted Matrix Stabilization Enables Thermoelectric Performance Enhancement in n-Type Quantum Dot Films.

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    Type
    Article
    Authors
    Nugraha, Mohamad Insan cc
    Sun, Bin cc
    Kim, Hyunho cc
    El Labban, Abdulrahman cc
    Desai, Saheena
    Chaturvedi, Neha cc
    Hou, Yi
    García de Arquer, F Pelayo cc
    Alshareef, Husam N. cc
    Sargent, E. cc
    Baran, Derya cc
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Functional Nanomaterials and Devices Research Group
    KAUST Solar Center (KSC)
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    CRG2018-3737.
    Date
    2021-04-15
    Online Publication Date
    2021-04-15
    Print Publication Date
    2021-04-28
    Embargo End Date
    2022-04-15
    Submitted Date
    2021-01-28
    Permanent link to this record
    http://hdl.handle.net/10754/668824
    
    Metadata
    Show full item record
    Abstract
    Efficient thermoelectric generators require further progress in developing n-type semiconductors that combine low thermal conductivity with high electrical conductivity. By embedding colloidal quantum dots (CQDs) in a metal halide matrix (QDMH), the metal halide matrix can enhance phonon scattering, thus suppressing thermal transport; however, simultaneously achieving high electrical conductivity in such systems has previously been limited by the deleterious impact of a large density of interfaces on charge transport. Therefore, new strategies are needed to improve charge carrier transport without sacrificing matrix-enabled low thermal transport. Here, we report the use of chemical doping in the solution state to improve electron transport while maintaining low thermal transport in QDMH films. By incorporating cesium carbonate (Cs2CO3) salts as a dopant prior to matrix formation, we find that the dopant stabilizes the matrix in colloidal inks and enables efficient n-type doping in QDMH films. As a result, this strategy leads to an enhanced n-type thermoelectric behavior in solution-processed QDMH films near room temperature, with a thermal conductivity of 0.25 W m–1 K–1—significantly lower than in prior films based on organic-ligand-cross-linked CQD films (>0.6 W m–1 K–1) and spark-plasma-sintered CQD systems (>1 W m–1 K–1). This study provides a pathway to developing efficient n-type thermoelectric materials with low thermal conductivity using single-step deposition and low-temperature processing.
    Citation
    Nugraha, M. I., Sun, B., Kim, H., El-Labban, A., Desai, S., Chaturvedi, N., … Baran, D. (2021). Dopant-Assisted Matrix Stabilization Enables Thermoelectric Performance Enhancement in n-Type Quantum Dot Films. ACS Applied Materials & Interfaces. doi:10.1021/acsami.1c01886
    Sponsors
    The authors would like to acknowledge Nimer Wehbe at KAUST Core Labs for supporting XPS measurements in this work. Research in this publication was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award no. OSRCRG2018-3737.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS applied materials & interfaces
    DOI
    10.1021/acsami.1c01886
    PubMed ID
    33856780
    Additional Links
    https://pubs.acs.org/doi/10.1021/acsami.1c01886
    ae974a485f413a2113503eed53cd6c53
    10.1021/acsami.1c01886
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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