In the operation of quantum dot-sensitized solar cells (QDSCs) and dye-sensitizied solar cells (DSSCs), recombination of photoexcited electrons at various interfaces are major concerns to achieve improved power-conversion efficiencies. We explore the strategies to effectively suppress recombination processes via proper modifications on those interfaces. Our interests also extend to utilizing plasmonic effects from metalic nanostructures, constructing tandem cell structures to enhance open-circuit voltages, and controlling surface morphologies of transparent conducting oxide (TCO) substrates or so.
We are working to design the next-generation energy-storage technology, imagining a world in which batteries for a variety of applications are designed from abundant, cheap, and safe electrode materials. Our interests lie on the physical/chemical phenomena at the interface between the electrode and electrolyte, and we also aim to enhance the electrochemical properties by synthesizing controlled morphologies of nanostructures.
Our research has been focused on designing the catalyst nanostructures for fuel cell, which is one of the promising energy-conversion systems due to their high-energy efficiency, zero emission, low-temperature operation, etc. We aim to develop metal-semiconductor (or nanoporous insulator) nanocomposite catalysts for enhancing the onset potential and reducing the amount of Pt loading.
Semiconductor nanoparticles with diameters in the range of 1 to 20 nm exhibit unique physical properties that give rise to many potential applications. To further improve the luminescent quantum efficiency and photovoltaic power-conversion efficiency, surface passivation and surface plasmon are utilized with controlled nanostructures.