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Structural, morphological, and optical characterizations of Mo, CrN and Mo:CrN sputtered coatings for potential solar selective applications

Lookup NU author(s): Professor Chun Yang Yin

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


Abstract

© 2018 Mo, CrN, and Mo:CrN sputtered coatings synthesized onto silicon Si(100) substrates were investigated as solar selective surfaces and their potential applications in optical devices. These coatings were characterized using XRD, SEM, UV-vis, and FTIR techniques. XRD investigation, showed a change in CrN thin film crystallite characteristic due to Mo doping. Compared to the CrN coating, the Mo:CrN film has a higher lattice parameter and lower grain size of 4.19 nm and 106.18 nm, respectively. FESEM morphology confirmed the decrement in Mo:CrN crystal size due to Mo doping. Optical analysis showed that in the visible range of the solar spectrum, the CrN coatings exhibit the highest solar absorptance of 66% while the lowest thermal emittance value of 5.67 was recorded for the CrN coating doped with Mo. Consequently, the highest solar selectivity of 9.6, and the energy band-gap of 2.88 eV were achieved with the Mo-doped CrN coatings. Various optical coefficients such as optical absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constants, and energy loss functions of these coatings were also estimated from the optical reflectance data recorded in the wavelength range of 190–2300 nm.


Publication metadata

Author(s): Ibrahim K, Mahbubur Rahman M, Taha H, Mohammadpour E, Zhou Z, Yin C-Y, Nikoloski A, Jiang Z-T

Publication type: Article

Publication status: Published

Journal: Applied Surface Science

Year: 2018

Volume: 440

Pages: 1001-1010

Print publication date: 15/05/2018

Online publication date: 31/01/2018

Acceptance date: 29/01/2018

Date deposited: 21/02/2018

ISSN (print): 0169-4332

ISSN (electronic): 1873-5584

Publisher: Elsevier BV * North-Holland

URL: https://doi.org/10.1016/j.apsusc.2018.01.267

DOI: 10.1016/j.apsusc.2018.01.267


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