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Coatings 2018, 8(3), 97; https://doi.org/10.3390/coatings8030097

Comparative Study of Furnace and Flash Lamp Annealed Silicon Thin Films Grown by Plasma Enhanced Chemical Vapor Deposition

1
Department of Electrical and Computer Engineering, Michigan State University, East Lansing, MI 48824, USA
2
Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48824, USA
3
Department of Electrical Engineering & Computer Science, South Dakota State University, Brookings, SD 57007, USA
*
Author to whom correspondence should be addressed.
Received: 29 November 2017 / Revised: 6 March 2018 / Accepted: 6 March 2018 / Published: 8 March 2018
(This article belongs to the Special Issue Plasma Etching and Deposition)
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Abstract

Low-temperature growth of microcrystalline silicon (mc-Si) is attractive for many optoelectronic device applications. This paper reports a detailed comparison of optical properties, microstructure, and morphology of amorphous silicon (a-Si) thin films crystallized by furnace annealing and flash lamp annealing (FLA) at temperatures below the softening point of glass substrate. The initial a-Si films were grown by plasma enhanced chemical vapor deposition (PECVD). Reflectance measurement indicated characteristic peak in the UV region ~280 nm for the furnace annealed (>550 °C) and flash lamp annealed films, which provided evidence of crystallization. The film surface roughness increased with increasing the annealing temperature as well as after the flash lamp annealing. X-ray diffraction (XRD) measurement indicated that the as-deposited samples were purely amorphous and after furnace crystallization, the crystallites tended to align in one single direction (202) with uniform size that increased with the annealing temperature. On the other hand, the flash lamp crystalized films had randomly oriented crystallites with different sizes. Raman spectroscopy showed the crystalline volume fraction of 23.5%, 47.3%, and 61.3% for the samples annealed at 550 °C, 650 °C, and with flash lamp, respectively. The flash lamp annealed film was better crystallized with rougher surface compared to furnace annealed ones. View Full-Text
Keywords: flash lamp annealing; crystallization; amorphous silicon; microcrystalline silicon; thin films flash lamp annealing; crystallization; amorphous silicon; microcrystalline silicon; thin films
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shrestha, M.; Wang, K.; Zheng, B.; Mokrzycki, L.; Fan, Q.H. Comparative Study of Furnace and Flash Lamp Annealed Silicon Thin Films Grown by Plasma Enhanced Chemical Vapor Deposition. Coatings 2018, 8, 97.

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