In our laboratory, we study optoelectronic properties of polymers and their functionalities.  In other words, our research is based on three keywords: polymers, photons, and electrons.  Using light as a tool, we aim to elucidate the properties and functions at the molecular level by directly observing ultrafast phenomena that give rise to optoelectronic properties at the molecular temporal and spatial scales.  Recently, we have been working on the development of polymer solar cells.