Cells with thermophotovoltaic efficiency of 40% are reported in this Nature research paper, paving the way for their potential use in thermal energy gird storage applications
. To test the cells under a well-controlled and relevant spectrum , a tungsten halogen lamp was used in combination with a concentrator. The concentrator consisted of a silver-plated elliptical reflector behind the lamp and a compound parabolic reflector obtained from Optiforms that further concentrated the light onto the cell. At the base of the CPC, a water-cooled aluminium aperture plate was suspended above the TPV cell . The area of the aperture was 0.
A d.c. power supply provided power to the tungsten halogen lamp and the voltage was controlled to achieve the desired emitter temperature. The lamp was rated for 5 kW at 3,200 K, but the temperature and power were tuned down to the desired emitter temperature by controlling the voltage to the lamp using the power supply.
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