Abstract
ABSTRACTPerfect absorbers have many application in different fields including photovoltaic, antireflective coatings, defence, energy harvesting and emissivity control. Here, we have designed and fabricated a near perfect optical broadband absorber, having absorption capacity of more than 99% from 300 to 2000 nm wavelength range. Textured Silicon wafer is used as base layer to fabricate multilayered optically graded assembly, while carbon nano tubes layer is used as a top layer for impedance matching. Subsequent layers are selected as per increasing refractive index values and varying micro/nano features for efficient light trapping. Moreover, multilayered assembly shows contact angle of more than 160° with roll-off angle of less than 5° which shows that it is not only a near perfect absorber but also a self-cleaning superhydrophobic surface. Conclusively, the properties of multilayered optically graded assembly imparts attractive applications of this superabsorber in the field of photovoltaic.
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