Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes

    80770.pdf (1.437Mb)
    Access Status
    Open access
    Authors
    Gonçales, V.R.
    Lian, J.
    Gautam, S.
    Hagness, D.
    Yang, Y.
    Tilley, R.D.
    Ciampi, Simone
    Gooding, J.J.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Gonçales, V.R. and Lian, J. and Gautam, S. and Hagness, D. and Yang, Y. and Tilley, R.D. and Ciampi, S. et al. 2020. Heterojunctions Based on Amorphous Silicon: A Versatile Surface Engineering Strategy to Tune Peak Position of Redox Monolayers on Photoelectrodes. Journal of Physical Chemistry C. 124 (1): pp. 836-844.
    Source Title
    Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.9b11252
    ISSN
    1932-7447
    Faculty
    Faculty of Science and Engineering
    School
    School of Molecular and Life Sciences (MLS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/CE14100036
    http://purl.org/au-research/grants/arc/FL150100060
    Remarks

    This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work seehttps://doi.org/10.1021/acs.jpcc.9b11252.

    URI
    http://hdl.handle.net/20.500.11937/80751
    Collection
    • Curtin Research Publications
    Abstract

    Heterojunctions are typically used to generate large photovoltages and to influence the direction of flow of charge carriers on photovoltaic and photocatalytic devices. Herein, we propose how heterojunctions can be used as a pathway for tuning the peak position of redox active monolayers. This was possible by exploring the principle of contact between materials in heterojunctions leading to a common equilibrium Fermi level for both sides of the heterojunction. The phenomenon was demonstrated with thin layers of intrinsic amorphous silicon deposited on platinum, indium tin oxide, and either n-type or p-type crystalline silicon electrodes. At fixed light-intensity conditions, the potential required for electron transfer of a model redox probe was modulated according to the substrate on which the amorphous silicon was deposited. This allowed us to alter the peak position of a redox process occurring on the electrolyte side of the junction despite it being isolated from the underlying conducting material. We show how such an effect can be explored in a potential range that encompasses any of the redox monolayers electroactive in aqueous electrolytes.

    Related items

    Showing items related by title, author, creator and subject.

    • Absence of a Relationship between Surface Conductivity and Electrochemical Rates: Redox-Active Monolayers on Si(211), Si(111), and Si(110)
      Zhang, Song; Ferrie, Stuart; Lyu, Xin; Xia, Y.; Darwish, Nadim ; Wang, Z.; Ciampi, Simone (2021)
      Optimizing the kinetics of an electrode reaction is central to the design of devices whose function spans from sensing to energy conversion. Electrode kinetics depends strongly on electrode surface properties, but the ...
    • Non-Ideal Cyclic Voltammetry of Redox Monolayers on Silicon Electrodes: Peak Splitting is Caused by Heterogeneous Photocurrents and Not by Molecular Disorder
      Zhang, S.; Lyu, X.; Hurtado Torres, C.; Darwish, Nadim ; Ciampi, Simone (2022)
      Over the last three decades, research on redox-active monolayers has consolidated their importance as advanced functional material. For widespread monolayer systems, such as alkanethiols on gold, non-ideal multiple peaks ...
    • Common Background Signals in Voltammograms of Crystalline Silicon Electrodes are Reversible Silica-Silicon Redox Chemistry at Highly Conductive Surface Sites
      Zhang, S.; Ferrie, S.; Peiris, C.R.; Lyu, X.; Vogel, Y.B.; Darwish, Nadim ; Ciampi, Simone (2021)
      The electrochemical reduction of bulk silica, due to its high electrical resistance, is of limited viability, namely, requiring temperatures in excess of 850 °C. By means of electrochemical and electrical measurements in ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.