Tailoring Charge Recombination in Photoelectrodes Using Oxide Nanostructures

Beniamino Iandolo, Björn Wickman, Elin Svensson, Daniel Paulsson, Anders Hellman

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    Abstract

    Optimizing semiconductor devices for solar energy conversion requires an explicit control of the recombination of photogenerated electron−hole pairs. Here we show how the recombination of charge carriers can be controlled in semiconductor thin films by surface patterning with oxide nanodisks. The control mechanism relies on the formation of dipole-like electric fields at the interface that, depending on the field direction, attract or repel minority carriers from underneath the disks. The charge recombination rate can be controlled through the choice of oxide material and the surface coverage of nanodisks. We provide proof-of-principle demonstration of this approach by patterning the surface of Fe2O3, one of the most studied semiconductors for light-driven water splitting, with TiO2 and Cu2O nanodisks. We expect this method to be generally applicable to a range of semiconductor-based solar energy conversion devices.
    Original languageEnglish
    JournalNano letters
    Volume16
    Issue number4
    Pages (from-to)2381-2386
    Number of pages6
    ISSN1530-6984
    DOIs
    Publication statusPublished - 2016

    Keywords

    • Energy conversion
    • Charge recombination
    • Hematite
    • Photoelectrodes
    • Water splitting

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