It has been reported that the intensity of optical measurements of spacecrafts in orbit
decreases with time. It has been concluded that this is due to the adhesion of
contaminants outgassed from the organic materials used in the spacecraft. I have been
studying photocatalysts as one of the methods to solve the contamination problem for
spacecrafts. In this presentation, I will introduce our research on photocatalysis for
spacecraft applications, especially the effect of oxygen on photocatalytic activity. In
addition to this research, I have also studied the fundamental optical properties of
indium gallium nitride and inorganic-organic perovskites. Some of these studies will
also be introduced.