Deposition of transparent Aluminum Oxide (Al2O3) films on silvered CSP mirrors

Houda Ennaceri, Dounya Barrit, Asmae Khaldoun, Abdelilah Benyoussef, Ahmed Ennaoui

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

This work consists on the improvement of first surface silvered thick glass mirrors. Several types of CSP mirrors based on different Physical Vapor Deposition techniques (PVD) and the presence or absence of the copper protective back layer were prepared: ([Ag Sputtered], [Ag Evaporated], [Cu Sputtered-Ag Evaporated], [Cu Evaporated-Ag Sputtered], [Cu Evaporated-Ag Evaporated] and [Cu Sputtered-Ag Sputtered]). The UV-VIS-NIR measurements have shown that the different combinations of Silvered mirrors have approximately the same Specular Reflectance. The mirrors with the Copper back protective layer were chosen as the optimal mirror combinations since the [Ag-Evaporated] and the [Ag-Sputtered] mirrors presented stability and adhesion problems during the top protective layer deposition process. A transparent Aluminum Oxide (Al2O3) protective layer was deposited on top of the selected mirrors using Dip-coating and Ion Layer Gas Reaction (Spray-ILGAR) deposition techniques. After the deposition of the protective layer, the optical properties, thickness, composition and surface morphology of the mirrors were tested. The results showed that the Specular Reflectance decreased after the deposition of Al2O3 layer by Dip-coating technique. On the other hand, an improvement in the Specular Reflectance of the [Cu Sputtered-Ag Sputtered] mirror was noticed after the deposition of Al2O3 with the ILGAR technique. An increase in the diffuse reflectance after the deposition of the Al2O3 protective layer by ILGAR method was also observed, this can be explained by the presence of some roughness on the surface of the mirror, which was confirmed by the SEM pictures. From these results, it can be concluded that the Al2O3 protective layer deposition by ILGAR technique is a very promising technique since enhances the specular reflectance of the mirrors. The final prepared mirror combination is composed of thick glass substrate, covered with a metal back layer of Sputtered Copper (50 nm), a reflective layer of Sputtered Silver (100 nm) deposited on top of the Copper layer, and a top protective layer of Al2O3 deposited by Spray-ILGAR technique.

Original languageEnglish
Title of host publicationProceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages114-119
Number of pages6
ISBN (Print)9781479973361
DOIs
Publication statusPublished - 12 Mar 2014
Externally publishedYes
Event2014 2nd International Renewable and Sustainable Energy Conference, IRSEC 2014 - Ouarzazate, Morocco
Duration: 17 Oct 201419 Oct 2014

Other

Other2014 2nd International Renewable and Sustainable Energy Conference, IRSEC 2014
CountryMorocco
CityOuarzazate
Period17/10/1419/10/14

Fingerprint

Oxide films
Aluminum
Mirrors
Copper
Glass
Coating techniques
Physical vapor deposition
Surface morphology
Silver
Adhesion
Optical properties
Surface roughness
Coatings
Scanning electron microscopy
Oxides
Ions
Substrates
Metals
Chemical analysis
Gases

Keywords

  • CSP Mirrors
  • Dip-Coating
  • Ion Layer Gas Reaction (Spray-ILGAR)
  • Specular Reflectance
  • Wettability

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment

Cite this

Ennaceri, H., Barrit, D., Khaldoun, A., Benyoussef, A., & Ennaoui, A. (2014). Deposition of transparent Aluminum Oxide (Al2O3) films on silvered CSP mirrors. In Proceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014 (pp. 114-119). [7059915] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IRSEC.2014.7059915

Deposition of transparent Aluminum Oxide (Al2O3) films on silvered CSP mirrors. / Ennaceri, Houda; Barrit, Dounya; Khaldoun, Asmae; Benyoussef, Abdelilah; Ennaoui, Ahmed.

Proceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014. Institute of Electrical and Electronics Engineers Inc., 2014. p. 114-119 7059915.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ennaceri, H, Barrit, D, Khaldoun, A, Benyoussef, A & Ennaoui, A 2014, Deposition of transparent Aluminum Oxide (Al2O3) films on silvered CSP mirrors. in Proceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014., 7059915, Institute of Electrical and Electronics Engineers Inc., pp. 114-119, 2014 2nd International Renewable and Sustainable Energy Conference, IRSEC 2014, Ouarzazate, Morocco, 17/10/14. https://doi.org/10.1109/IRSEC.2014.7059915
Ennaceri H, Barrit D, Khaldoun A, Benyoussef A, Ennaoui A. Deposition of transparent Aluminum Oxide (Al2O3) films on silvered CSP mirrors. In Proceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014. Institute of Electrical and Electronics Engineers Inc. 2014. p. 114-119. 7059915 https://doi.org/10.1109/IRSEC.2014.7059915
Ennaceri, Houda ; Barrit, Dounya ; Khaldoun, Asmae ; Benyoussef, Abdelilah ; Ennaoui, Ahmed. / Deposition of transparent Aluminum Oxide (Al2O3) films on silvered CSP mirrors. Proceedings of 2014 International Renewable and Sustainable Energy Conference, IRSEC 2014. Institute of Electrical and Electronics Engineers Inc., 2014. pp. 114-119
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abstract = "This work consists on the improvement of first surface silvered thick glass mirrors. Several types of CSP mirrors based on different Physical Vapor Deposition techniques (PVD) and the presence or absence of the copper protective back layer were prepared: ([Ag Sputtered], [Ag Evaporated], [Cu Sputtered-Ag Evaporated], [Cu Evaporated-Ag Sputtered], [Cu Evaporated-Ag Evaporated] and [Cu Sputtered-Ag Sputtered]). The UV-VIS-NIR measurements have shown that the different combinations of Silvered mirrors have approximately the same Specular Reflectance. The mirrors with the Copper back protective layer were chosen as the optimal mirror combinations since the [Ag-Evaporated] and the [Ag-Sputtered] mirrors presented stability and adhesion problems during the top protective layer deposition process. A transparent Aluminum Oxide (Al2O3) protective layer was deposited on top of the selected mirrors using Dip-coating and Ion Layer Gas Reaction (Spray-ILGAR) deposition techniques. After the deposition of the protective layer, the optical properties, thickness, composition and surface morphology of the mirrors were tested. The results showed that the Specular Reflectance decreased after the deposition of Al2O3 layer by Dip-coating technique. On the other hand, an improvement in the Specular Reflectance of the [Cu Sputtered-Ag Sputtered] mirror was noticed after the deposition of Al2O3 with the ILGAR technique. An increase in the diffuse reflectance after the deposition of the Al2O3 protective layer by ILGAR method was also observed, this can be explained by the presence of some roughness on the surface of the mirror, which was confirmed by the SEM pictures. From these results, it can be concluded that the Al2O3 protective layer deposition by ILGAR technique is a very promising technique since enhances the specular reflectance of the mirrors. The final prepared mirror combination is composed of thick glass substrate, covered with a metal back layer of Sputtered Copper (50 nm), a reflective layer of Sputtered Silver (100 nm) deposited on top of the Copper layer, and a top protective layer of Al2O3 deposited by Spray-ILGAR technique.",
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