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Thermophotovoltaic systems in principle enable utilization of heat that isusually regarded as wasted energy. However, the wavelength selectivity of thethermal emitter required for high efficiencies is rather difficult to controlwith conventional designs. Here, we design a thermophotovoltaic systemcomprising silicon rods as thermal emitter with a relatively narrow emissionspectrum and a photovoltaic cell with a band gap corresponding to 1.76 $\mu$m,and verify efficient power generation. By accurately measuring the heat fluxthat enters the emitter, the emitter temperature, and the electrical outputpower of the photovoltaic cell, we find that the actual system efficiency(ratio of ingoing heat flux to output power) is 11.2% at an emitter temperatureof 1338 K, and that the output power density footprint is 0.368 W/cm2. Theobtained efficiency is relatively high, i.e., 1.65 times that of the previouslyreported record value (6.8%). Further efficiency improvements in the future maylead to development of distributed energy supplies using combustion heat.

High-efficiency thermophotovoltaic system that employs an emitter based on a silicon rod-type photonic crystal