All aspects of the use of optics in the energy field are considered by this group. The group encompasses the conversion of light energy into other forms of energy including solar conversion via photovoltaic's and photo-thermal processes. Research on organic and inorganic photovoltaic devices, as well as design of optical systems to direct light into these devices, falls within this group. Photovoltaic materials, structures, performance and economics are considered. Devices and structures with improved efficiency, and/or involving novel use of light for illumination are important aspects of this group’s work. Additional aspects of illumination covered include the modeling and design of lighting systems as well as perceptional consideration.