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    Life on the Urbach Edge

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    Embargo End Date:
    2023-08-12
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    Type
    Article
    Authors
    Ugur, Esma cc
    Ledinský, Martin cc
    Allen, Thomas
    Holovský, Jakub
    Vlk, Aleš cc
    De Wolf, Stefaan cc
    KAUST Department
    Material Science and Engineering Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    IED OSR-2019-4208
    IED OSR-2019-4580
    OSR-CARF/CCF-3079
    OSR-CRG2019-4093
    OSR-CRG2020-4350
    REI/1/4833-01-01
    Date
    2022-08-12
    Embargo End Date
    2023-08-12
    Permanent link to this record
    http://hdl.handle.net/10754/680256
    
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    Show full item record
    Abstract
    The Urbach energy is an expression of the static and dynamic disorder in a semiconductor and is directly accessible via optical characterization techniques. The strength of this metric is that it elegantly captures the optoelectronic performance potential of a semiconductor in a single number. For solar cells, the Urbach energy is found to be predictive of a material's minimal open-circuit-voltage deficit. Performance calculations considering the Urbach energy give more realistic power conversion efficiency limits than from classical Shockley-Queisser considerations. The Urbach energy is often also found to correlate well with the Stokes shift and (inversely) with the carrier mobility of a semiconductor. Here, we discuss key features, underlying physics, measurement techniques, and implications for device fabrication, underlining the utility of this metric.
    Citation
    Ugur, E., Ledinský, M., Allen, T. G., Holovský, J., Vlk, A., & De Wolf, S. (2022). Life on the Urbach Edge. The Journal of Physical Chemistry Letters, 7702–7711. https://doi.org/10.1021/acs.jpclett.2c01812
    Sponsors
    This publication is based upon work supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award nos. OSR-CARF/CCF-3079, OSR-CRG2019-4093, OSR-CRG2020-4350, IED OSR-2019-4208, IED OSR-2019-4580, and REI/1/4833-01-01. J.H. acknowledges the Czech Ministry of Education, Youth and Sports grant no. CZ.02.1.01/0.0/0.0/15_003/0000464 (Centre of Advanced Photovoltaics). M.L. and A.V. acknowledge grant no CZ.02.1.01/0.0/0.0/16_026/0008382 (CARAT) and LUASK 22202. M.L., J.H., and A.V. also acknowledge the use of the CzechNanoLab research infrastructure supported by the MEYS (LM2018110).
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry Letters
    DOI
    10.1021/acs.jpclett.2c01812
    PubMed ID
    35960888
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.jpclett.2c01812
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpclett.2c01812
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program; KAUST Solar Center (KSC)

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