Sun-free photovoltaics is a photovoltaics technology which does not require sunlight to produce electricity.[1] This technique was developed by research team at Massachusetts Institute of Technology.[2] Photovoltaic cells convert light to electricity most efficiently at specific wavelengths.[3][4] The surface features of Sun-free photovoltaics is engineered such that it converts heat energy into the specific wavelengths.[5] This increases the efficiency of existing thermophotovoltaic (TPV) systems.[6]