Plasmon-enhanced optical absorption with graded bandgap in diamond-like carbon (DLC) films

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• 作者：B. Ghosh ; F. Guzmán-Olivos ; R. Espinoza-González
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：52
• 期：1
• 页码：218-228
• 全文大小：3,008 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistryr>Materials Sciencer>Characterization and Evaluation Materialsr>Polymer Sciencesr>Continuum Mechanics and Mechanics of Materialsr>Crystallographyr>Mechanicsr>
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：52

文摘

Diamond-like carbon (DLC) films with tunable optical bandgap (E_g) were successfully deposited on glass and n-Si (100) substrates by radio frequency (RF)-sputtering technique in different argon (Ar) and acetylene (C₂H₂) plasmas. The bandgap of the films can be tuned from 1.41 to 1.28 eV, which correlates with the sp2 content, which increases from 56.3 to 63.7 %, respectively. The different ratios of sp2/sp3 lead to different bandgaps of the DLC films. Plasmonic nanoparticles of silver (Ag) were also embedded in the DLC matrix by reactive magnetron sputtering to study the enhancement of light absorption in DLC films. The absorption coefficient significantly increased when the DLC films were incorporated with 10 at.% of silver nanoparticles. Raman and X-ray photoelectron spectroscopy (XPS) studies were utilized to determine the bonding nature and sp2/sp3 ratios of DLC–Ag films.