Current research focuses photoelectrochemical (PEC) water splitting, also known as artificial photosynthesis, through which solar energy is captured and stored in the form of chemical fuel (H2). The goal is to find a photoelectrode material that utilizes solar radiation with high efficiency while enjoying decent chemical stability against the harsh PEC environment, through an integrated approach of material synthesis, photoelectrochemical studies, theoretical modeling, and advanced optical characterizations. A major research emphasis is the combinatorial synthesis of complex semiconductor metal oxide thin films/nanostructures for band gap engineering, using various techniques. The material screening is performed with photoelectrochemistry methods and coupled with ultrafast laser spectroscopy for a comprehensive understanding of the exciton dynamics and the interfacial charge transfer process. Other interests include the experimental/theoretical studies of nanophotonic/plasmonic nanostructures for improving light absorption in solar energy devices and applications in chemical/biochemical sensing.
Dissertation: Localized Surface Plasmon of Quasi-One-Dimensional Metallic Nanostructures