Lancaster EPrints

Photoelectrolysis Using Type-II Semiconductor Heterojunctions

Hayne, Manus and Harrison, Samuel (2017) Photoelectrolysis Using Type-II Semiconductor Heterojunctions. Scientific Reports, 7. ISSN 2045-2322

[img]
Preview
PDF (Photoelectrolysis Using Type-II Semiconductor Heterojunctions) - Submitted Version
Available under License Creative Commons Attribution.

Download (686Kb) | Preview
    [img]
    Preview
    PDF (Harrison Scientific Reports 7 11638 (2017)) - Published Version
    Available under License Creative Commons Attribution.

    Download (3316Kb) | Preview

      Abstract

      The solar-powered production of hydrogen for use as a renewable fuel is highly desirable for the world’s future energy infrastructure. However, difficulties in achieving reasonable efficiencies, and thus cost-effectiveness, have hampered significant research progress. Here we propose the use of semiconductor nanostructures to create a type-II heterojunction at the semiconductor–water interface in a photoelectrochemical cell (PEC) and theoretically investigate it as a method of increasing the maximum photovoltage such a cell can generate under illumination, with the aim of increasing the overall cell efficiency. A model for the semiconductor electrode in a PEC is created, which solves the Schrödinger, Poisson and drift–diffusion equations self-consistently. From this, it is determined that ZnO quantum dots on bulk n-InGaN with low In content is the most desirable system, having electron-accepting and -donating states straddling the oxygen- and hydrogen-production potentials for , though large variance in literature values for certain material parameters means large uncertainties in the model output. Accordingly, results presented here should form the basis for further experimental work, which will in turn provide input to refine and develop the model.

      Item Type: Journal Article
      Journal or Publication Title: Scientific Reports
      Subjects:
      Departments: Faculty of Science and Technology > Physics
      ID Code: 87765
      Deposited By: ep_importer_pure
      Deposited On: 14 Sep 2017 13:14
      Refereed?: Yes
      Published?: Published
      Last Modified: 21 Sep 2018 01:09
      Identification Number:
      URI: http://eprints.lancs.ac.uk/id/eprint/87765

      Actions (login required)

      View Item