Residual stress in amorphous and nanocrystalline Si films prepared by PECVD with hydrogen dilution

Fu, Yong Qing, Luo, J. K., Milne, S. B., Flewitt, Andrew and Milne, William (2005) Residual stress in amorphous and nanocrystalline Si films prepared by PECVD with hydrogen dilution. Materials Science and Engineering: B, 124-5. pp. 132-137. ISSN 0921 5107

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Abstract

Amorphous and nanocrystalline Si films were prepared using radio-frequency (13.56 MHz) plasma enhanced chemical vapour deposition with different SiH4/H2 ratios. The film residual stress was measured using curvature method as a function of SiH4 gas flow ratio (SiH4/(SiH4 + H2)). Results from high resolution scanning electron microscopy, X-ray diffraction and Raman scattering studies revealed the appearance of nanocrystallites with SiH4 gas ratio less than 3%. With a gradual decrease of SiH4 gas ratio, the film intrinsic stress increased significantly until SiH4 gas ratio reached 2%. Below that critical value, the film intrinsic stress decreased sharply. Different mechanisms of stress formation and relaxation during film growth were discussed, including ion bombardment effect, hydrogen and hydrogen induced bond-reconstruction, nanocomposite effects (nanocrystal embedded in an amorphous Si matrix). Results indicated that nanocomposite effect is the dominant factor in this maximum stress condition.

Item Type:	Article
Uncontrolled Keywords:	A–Si:H; nc-Si; Hydrogen; PECVD; Stress
Subjects:	F200 Materials Science
Department:	Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User:	Becky Skoyles
Date Deposited:	26 Mar 2015 16:42
Last Modified:	12 Oct 2019 19:06
URI:	http://nrl.northumbria.ac.uk/id/eprint/21854

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