Tailored energy level alignment at MoOX/GaP interface for solar-driven redox flow battery application

Dowon Bae, Gerasimos Kanellos, Kristina Wedege, Emil Dražević, Anders Bentien, Wilson Smith

Research output: Contribution to journalArticleScientificpeer-review

Abstract

MoOX is commonly considered to be a high work-function semiconductor. From x-ray photoelectron spectroscopy and photoelectrochemical analysis, it is shown that MoOX can be considered as an effective hole transfer layer for the GaP-based device. Specifically, in the absence of carbon contamination using an ion beam cleaning step, the oxygen vacancy derived defect band located inside the bandgap becomes the main charge transfer mechanism. We demonstrate, for the first time, a device with a MoOX/GaP junction that functions as an unbiased photo-charging cell for the redox flow battery system with AQS/AQSH2∥I/I3redox couples. This work has important implications toward enabling MoOX applications beyond the conventional solar cells, including electrochemical energy storage and chemical conversion systems.
Original languageEnglish
Article number124710
Number of pages9
JournalJournal of Chemical Physics
Volume152
Issue number12
DOIs
Publication statusPublished - 2020

Keywords

  • Redox flow battery
  • photoelectrochemical cells
  • gallium phosphide
  • Molybdenum oxide
  • Solar redox flow battery
  • photoelectrochemistry
  • Energy storage

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