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Enhanced optical absorption of graphene-based heat mirror with tunable spectral selectivity

Selvakumar, N and Biswas, A and Krupanidhi, SB and Barshilia, HC (2018) Enhanced optical absorption of graphene-based heat mirror with tunable spectral selectivity. In: SOLAR ENERGY MATERIALS AND SOLAR CELLS, 186 . pp. 149-153.

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Official URL: http://dx.doi.org/10.1016/j.solmat.2018.06.041


Graphene based heat mirror (i.e., graphene/Cu/graphene multilayer coating) was designed and developed to achieve enhanced optical absorption with tunable spectral selectivity. The concept of a heat mirror and a high/low/high refractive index stack was used to develop the graphene/Cu/graphene absorber and the transition from high transmittance to high absorptance was realized on quartz substrates. The thickness of the Cu layer has an important role in creating the destructive interference, for achieving high absorptance and low emittance. The refractive index of the multilayer graphene transferred on Si substrate was studied using phase-modulated spectroscopic ellipsometry. An absorptance of 0.91 and emittance of 0.22 was achieved for the SiO2/graphene/ Cu/graphene multilayer coating. For the first time, the feasibility of graphene/Cu/graphene multilayer coating for photothermal applications have been demonstrated.

Item Type: Journal Article
Additional Information: Copy right for this article belong to ELSEVIER SCIENCE BV
Keywords: Graphene; Heat mirror; Absorptance; Emittance; Multilayer absorber; Ellipsometry
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 15 Oct 2018 14:20
Last Modified: 15 Oct 2018 14:20
URI: http://eprints.iisc.ac.in/id/eprint/60869

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