Tailoring Charge Recombination in Photoelectrodes Using Oxide Nanostructures
Journal article, 2016

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.

photoelectrodes

Energy conversion

hematite

water splitting

charge recombination

Author

Beniamino Iandolo

Chalmers, Physics, Chemical Physics

Björn Wickman

Competence Centre for Catalysis (KCK)

Chalmers, Physics, Chemical Physics

Elin Svensson

Chalmers, Physics

Daniel Paulsson

Chalmers, Physics

Anders Hellman

Chalmers, Physics, Chemical Physics

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 16 4 2381-2386

Subject Categories

Physical Sciences

DOI

10.1021/acs.nanolett.5b05154

More information

Created

10/8/2017