Ultrafast photophysics of nanostructured oxides

Oxide based compounds are currently under intensive study as materials with novel functionalities. The electronic conductivity is a key property that determines the potential use of an oxide family: traditionally it is desirable to suppress the conductivity of ferroelectric and piezoelectric materials, while enhancing it for semiconductor applications. Novel nanostructured oxide materials are challenging this paradigm, however, in multiferroic photovoltaic solar cells and ferroelectric transistors. In addition the catalytic properties of nano-oxide interfaces may drive attactive reactions, such as solar water splitting.

The challenge that will be undertaken in this PhD project at the University of Warwick is to examine charge generation in oxide nanomaterials on ultrafast timescales. The aim is to determine the conductivity and quantum efficiency of photocarrier generation using advanced time-resolved spectroscopic techniques, such as optical-pump terahertz-probe spectroscopy, and ultrafast optical reflectivity. In addition to elucidating the physics of charge formation and transport in oxide nanomaterials and heterostructures, this project will greatly aid the identification of suitable materials for semiconducting, photovoltaic and photocatalytic applications. The charge carrier yield should be maximised for photonic devices, while enhanced electrical transport is also saught in oxide semiconductors.