WO3-BiVO4 n-n heterostructures have demonstrated remarkable performance in photoelectrochemical water splitting due to the synergistic effect between the individual components. Although the enhanced functional capabilities of this system have been widely reported, in-depth mechanistic studies explaining the carrier dynamics of this heterostructure are limited. The main goal is to provide rational design strategies for further optimization as well as to extend these strategies to different candidate systems for solar fuel production. In the present study, we perform systematic optoelectronic and photoelectrochemical characterization to understand the carrier dynamics of the system and develop a simple physical model to highlight the importance of the selective contacts to minimize bulk recombination in this heterostructure. Our results collectively indicate that while BiVO4 is responsible for the enhanced optical properties, WO3 controls the transport properties of the heterostructured WO3-BiVO4 system, leading to reduced bulk recombination.
Bibliographical noteFunding Information:
We acknowledge financial support from University Jaume I through the project P11B2014-51, from Generalitat Valenciana (ISIC/2012/008 Institute of Nanotechnologies for Clean Energies and ACOMP/2015/105) and from the European Commission through the Seventh Framework Program [FP7/2007?2013] grant agreement 316494. The Serveis Centrals at UJI (SCIC) is also acknowledged.
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry