Thermophotovoltaic (TPV) energy conversion is a direct conversion process from heat to electricity via photons. A basic thermophotovoltaic system consists of a hot object emitting thermal radiation and a photovoltaic cell similar to a solar cell but tuned to the spectrum being emitted from the hot object. As TPV systems. PVTypical photovoltaics work by creating a near the front surface of a thin material. When photons above the energy of the material hit atoms within the bulk. constructed an elementary TPV system at in 1956. However, is widely cited as the inventor based on lectures he gave at MIT between 1960–1961 which, unlike Kolm's system, led to research and development. In the 1980s, efficiency. For black body emitters where photon recirculation is achieved via filters, states that a black body emits light with a spectrum given by: $${displaystyle I'(lambda,T)={frac {2hc^{2}}{lambda ^{5}}}{frac {1}{e^{frac {hc}{lambda kT}}-1}}}$$ TPVs promise efficient and economically viable power systems for both military and commercial applications. Compared to traditional nonrenewable energy sources, burner TPVs have little emissions and are virtually silent. Solar TPVs are a source of emission-free. RTGsConventional (RTGs) used to power spacecraft use a radioactive material whose radiation is used to heat a block of material and then converted to electricity using a EfficiencyThe upper limit for efficiency in TPVs (and all systems that convert heat energy to work) is the, that of an ideal. This efficiency is given by: EmittersEfficiency, temperature resistance and cost are the three major factors for choosing a TPV emitter. Efficiency is determined by energy absorbed relative to incoming radiation. High temperature operation is crucial.
