Effect of roughness and nanoporosity on optical properties of black and reflective Al films prepared by magnetron sputtering

0542812 - FZÚ 2022 RIV NL eng J - Journal Article
Hruška, Petr - More Chevalier, Joris - Novotný, Michal - Čížek, J. - Melikhova, O. - Fekete, Ladislav - Poupon, Morgane - Bulíř, Jiří - Volfová, Lenka - Butterling, M. - Liedke, M.O. - Wagner, A. - Fitl, Přemysl
Effect of roughness and nanoporosity on optical properties of black and reflective Al films prepared by magnetron sputtering.
Journal of Alloys and Compounds. Roč. 872, Aug (2021), č. článku 159744. ISSN 0925-8388. E-ISSN 1873-4669
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-09347S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760; AV ČR LQ100102001
Program: Prémie Lumina quaeruntur
Institutional support: RVO:68378271
Keywords : atomic force microscopy * black aluminum * magnetron sputtering * positron annihilation spectroscopy * spectrophotometric reflectance
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 6.371, year: 2021
Method of publishing: Limited access
https://doi.org/10.1016/j.jallcom.2021.159744

In this work, a comparison of the microstructure of black and classic reflective aluminum films is provided. The N2 concentration during the magnetron sputtering deposition has a key impact on the growth process and final moth-eye-like morphology of black Al films. The study of films with thickness ~1.5 μm and ~8 μm and fully developed microstructure enabled us to clarify the origin of different optical properties of black and reflective Al. Atomic force microscopy measurements showed high roughnesses for both types of films leading to light scattering from their surface. In the case of black Al, the incident light is absorbed in a fractal-like nanoporous surface.
Permanent Link: http://hdl.handle.net/11104/0320193