Optimization of AlxOy/Pt/AlxOy multilayer spectrally selective coatings for solar-thermal applications

被引：47

作者：

Nuru, Z. Y. ^{[1
,2
]}

Arendse, C. J. ^{[2
]}

Khamlich, S. ^{[1
]}

Maaza, M. ^{[1
]}

机构：

[1] Natl Res Fdn, MRD iThemba LABS, NANOAFNET, Somerset W, South Africa

[2] Univ Western Cape, Dept Phys, Bellville, South Africa

来源：

VACUUM | 2012年 / 86卷 / 12期

基金：

新加坡国家研究基金会;

关键词：

Multilayer; Al2O3; Pt; Spectral selectivity; Solar-thermal; Evaporator; Optical constant; Simulation; OPTICAL-PROPERTIES; ABSORBER; FILMS; OXIDE;

D O I：

10.1016/j.vacuum.2012.06.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spectrally selective AlxOy/Pt/AlxOy multilayer absorber coatings were deposited onto corning 1737 glass, Si (111) and copper substrates using electron beam (e-beam) vacuum evaporator at room temperature. The employment of ellipsometric measurements and optical simulation was proposed as an effective method to optimize and deposit multilayer solar absorber coatings. The optical constants (n and k) measured using spectroscopic ellipsometry, showed that both AlxOy layers, which used in the coatings, were dielectric in nature and the Pt layer was semi-transparent. The optimized multilayer coatings exhibited high solar absorptance alpha similar to 0.94 +/- 0.01 and low thermal emittance epsilon similar to 0.06 +/- 0.01 at 82 degrees C. The Rutherford backscattering spectroscopy (RBS) data of AlxOy/Pt/AlxOy multilayer absorber indicated the AlxOy layers present in the coating were nearly stoichiometry. The scanning electron microscope analysis (SEM) result indicated that the average diameter and inter-particles distance of Pt grains were statistically about 146 +/- 0.17 nm and 6-10 +/- 0.2 nm respectively. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：2129 / 2135

页数：7

共 27 条

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