Efficient infrared sunlight absorbers based on gold-covered, inverted silicon pyramid arrays
| Autor: | Hu, Jinhui, Pérez, Luis A., Garcia-Pomar, Juan Luis, Mihi, Agustín, Garriga, Miquel, Alonso, M. Isabel, Goñi, Alejandro R. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Mater. Adv. 3, 2364-2372 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1039/d1ma01237a |
| Popis: | The transparency of silicon in the infrared region enables the design of nano/microstructures for implementation in devices to harvest the infrared (IR) part of the solar spectrum. Herein we report a strategy that uses arrays of inverted silicon pyramids covered with a thin gold film, which exhibit substantial light absorption in the infrared spectral range (below the gap of Si). The absorption stems from the resonant excitation at infrared wavelengths of surface-plasmon polaritons at the metal/dielectric interface mainly by tuning size and separation of the inverted pyramids. The array-parameters optimization proceeded by iteration of the calculation and measurement of the infrared response using finite difference time-domain simulations and Fourier-transform IR spectroscopy, respectively. We show two fabrication routes for this kind of metal/silicon metamaterials either by photolithography or scalable nanoimprint techniques for a seamless integration in optoelectronic fabrication processes. Comment: Manuscript: 15 pages, 7 figures + Supplementary Information. Submitted to Mater. Adv. (2021) |
| Databáze: | arXiv |
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