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Experimental studies of W-Al 2 O 3 composite thin films for solar absorptance
Indian Journal of Physics ( IF 2 ) Pub Date : 2020-11-03 , DOI: 10.1007/s12648-020-01911-3
Mohan Kumar Thinakallu Ramakrishna Reddy , P. V. Srihari , Sahas , M. S. Krupashankara

Solar energy has environmental benefits by reducing the pollution and global warming resulting in cleaner water and air. One of the key factors is the absorber surface for entrapping the solar energy that is receiving from solar spectrum under the wavelength range of 250–2500 nm. Generally, absorber surfaces are made of thin films that are mechanically resistant and are common practice in the optical industries. Motivation to carry out this research work is to develop nanocomposite thin films coatings for maximizing solar absorptance and minimizing thermal emittance. W-Al2O3 composite thin films are developed by co-sputtering process upon consideration of process parameters. Design of experiment has been adopted to study the deposition parameters and analysis. Characterization of deposited thin films was performed to determine the solar absorptance and thermal emittance using 410-Solar and ET 100 Emissometer, respectively. It was found that for deposition parameters of DC power 750 W, RF power 1050 W and argon gas flow rate 250 sccm, an absorptance of 0.709 and thermal emittance of 0.175 are observed. From the SEM analysis, the average particle size of alumina is around 0.25 μm. EDAX was performed to determine the material composition of deposited thin films. This type of coatings requires for industries manufacturing solar cooker, solar water heaters and solar driers.



中文翻译:

W-Al 2 O 3复合薄膜的日光吸收实验研究

太阳能通过减少污染和全球变暖而产生环境效益,从而使水和空气更清洁。关键因素之一是用于吸收从250-2500 nm波长范围内的太阳光谱接收的太阳能的吸收器表面。通常,吸收体表面由具有机械抗性的薄膜制成,并且在光学工业中很常见。开展这项研究工作的动机是开发纳米复合薄膜涂料,以最大程度地提高日光吸收率并将热发射率降至最低。铝2 O 3考虑到工艺参数,通过共溅射工艺开发复合薄膜。通过实验设计来研究沉积参数和分析。分别使用410-Solar和ET 100发射仪对沉积的薄膜进行表征,以确定日光吸收率和热发射率。发现对于DC功率750W,RF功率1050W和氩气流量250sccm的沉积参数,观察到吸收率为0.709,热发射率为0.175。根据SEM分析,氧化铝的平均粒径为约0.25μm。进行EDAX以确定沉积的薄膜的材料组成。这种类型的涂料对于制造太阳能灶具,太阳能热水器和太阳能干燥器的工业来说是必需的。

更新日期:2020-11-03
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