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| Naji, M. |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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Elis, Marie
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- 2024Self‐Modification of Defective TiO<sub>2</sub> under Controlled H<sub>2</sub>/Ar Gas Environment and Dynamics of Photoinduced Surface Oxygen Vacanciescitations
- 2024Co‐sputtering of A Thin Film Broadband Absorber Based on Self‐Organized Plasmonic Cu Nanoparticlescitations
- 2023Co‐sputtering of A Thin Film Broadband Absorber Based on Self‐Organized Plasmonic Cu Nanoparticles
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article
Co‐sputtering of A Thin Film Broadband Absorber Based on Self‐Organized Plasmonic Cu Nanoparticles
Abstract
Funding Information: This work had been funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – project number 413974664, i.e., projects RO 3640/12‐1 and FA 234/32‐1 as well as by DFG‐Grant KI 1263/21‐1. Publisher Copyright: © 2023 The Authors. Particle & Particle Systems Characterization published by Wiley-VCH GmbH. ; The efficient conversion of solar energy to heat is a prime challenge for solar thermal absorbers, and various material classes and device concepts are discussed. One exciting class of solar thermal absorbers are plasmonic broadband absorbers that rely on light absorption thanks to plasmonic resonances sustained in metallic nanoparticles. This work focuses on Cu/Al2O3 plasmonic absorbers, which consist of a thin film stack of a metallic Cu-mirror, a dielectric Al2O3 spacer, and an Al2O3/Cu-nanoparticle nanocomposite. This work explores two preparation routes for the Al2O3/Cu-nanoparticle nanocomposite, which rely on the self-organization of Cu nanoparticles from sputtered atoms, either in the gas phase (i.e., via gas aggregation source) or on the thin film surface (i.e., via simultaneous co-sputtering). While in either case, Cu-Al2O3-Al2O3/Cu absorbers with a low reflectivity over a broad wavelength regime are obtained, the simultaneous co-sputtering approach enabled better control over the film roughness and showed excellent agreement with dedicated simulations of the optical properties of the plasmonic absorber using a multi-scale modeling approach. Upon variation of the thickness and filling factor of the Al2O3/Cu nanocomposite layer, the optical properties of the plasmonic absorbers are tailored, reaching an integrated reflectance down to 0.17 (from 250 to 1600 nm). ; Peer reviewed