His research focuses on designing new nanostructured architectures for nanophotonics and the next generation of nanodevices, including photovoltaics and resistive RAM. This interest is reinforced by his efforts to understand light scattering and trapping in nanostructured materials. In addition, he is interested in the transport of charge carriers across these solar cells and improving light coupling to increase the efficiency of photoinduced charge separation. His group is also concerned with fundamental physical properties of nanomaterials, such as the transport and switching behavior of nanowire field effect transistors. His work has fed back into the design of next-generation solar cells, having been picked up by the photovoltaics industry in Taiwan.