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The transparency of silicon in the infrared region enables the design ofnano/microstructures for implementation in devices to harvest the infrared (IR)part of the solar spectrum. Herein we report a strategy that uses arrays ofinverted silicon pyramids covered with a thin gold film, which exhibitsubstantial light absorption in the infrared spectral range (below the gap ofSi). The absorption stems from the resonant excitation at infrared wavelengthsof surface-plasmon polaritons at the metal/dielectric interface mainly bytuning size and separation of the inverted pyramids. The array-parametersoptimization proceeded by iteration of the calculation and measurement of theinfrared response using finite difference time-domain simulations andFourier-transform IR spectroscopy, respectively. We show two fabrication routesfor this kind of metal/silicon metamaterials either by photolithography orscalable nanoimprint techniques for a seamless integration in optoelectronicfabrication processes.

Efficient infrared sunlight absorbers based on gold-covered, inverted silicon pyramid arrays