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Ultra-black superhydrophobic multilayer broadband optical absorber

Published online by Cambridge University Press:  17 December 2018

Viney Ghai,
Harpreet Singh and
Prabhat K. Agnihotri
Viney Ghai*
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Ropar, Punjab, India
Harpreet Singh
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Ropar, Punjab, India
Prabhat K. Agnihotri
Affiliation:
Department of Mechanical Engineering, Indian Institute of Technology Ropar, Punjab, India
*
*(Email: viney.ghai@iitrpr.ac.in)
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Abstract

Perfect 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.

Keywords

adsorptionnanostructureoptical propertiesspectroscopytexture

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Type
Articles
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MRS Advances , Volume 4 , Issue 3-4: Nanomaterials , 2019, pp. 163 - 168
Copyright
Copyright © Materials Research Society 2018 

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