All papers were peer reviewed. Thermophotovoltaic (TPV) devices convert heat into electricity using photovoltaic (PV) cells. Typically, the system consists of an emitter, a spectral control component and a PV cell. Some applications are: solar systems, space power applications, solar greenhouse or home heating furnaces. Thermophotovoltaic (TPV) technology is a promising new means for the direct conversion of thermal to electric energy. Its potential applications range from military power, to space propulsion, to commercial products for market niches in auxiliary power sources, co-generation of electricity and heat, and high temperature waste heat utilization.