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Appl. Sci. 2017, 7(8), 859; doi:10.3390/app7080859

Influences of Doping and Crystal Orientation on Surface Roughening upon Alcohol Grafting onto Silicon Hydride

1
College of Arts and Sciences, University of North Carolina at Chapel Hill (UNC), Chapel Hill, NC 27514, USA
2
Institute of New Drug Development, ChinaMedical University, No. 91 Hsueh-Shih Road, Taichung 40402, Taiwan
*
Author to whom correspondence should be addressed.
Received: 12 July 2017 / Revised: 17 August 2017 / Accepted: 18 August 2017 / Published: 21 August 2017
(This article belongs to the Section Chemistry)
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Abstract

An alcohol bearing alkyne was thermally grafted to both p-type and n-type silicon (111) and (100) substrate of comparable doping levels and surface flatness. The surface topography as well as the surface chemistry was examined via atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and water contact angle measurements. P-type silicon (111) was observed to experience roughening on the surface upon functionalization while n-type silicon (111) surfaces remained relatively unchanged. When the alcohol was grafted onto silicon (100) surface, the roughening effect was found to be even more profound for the p-type while the effects were marginal for the n-type surfaces. Both roughening effects were attributed to the differential weakening of the Si–Si backbond induced by majority carriers in p- and n-type silicon while (111) was observed to be able to resist the roughening effect better and this was explained by the notion of its denser adatom surface packing as well as the presence of surface defects. View Full-Text
Keywords: silicon (111) and (100); surface etching; dopant silicon (111) and (100); surface etching; dopant
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Tung, J.; Khung, Y.L. Influences of Doping and Crystal Orientation on Surface Roughening upon Alcohol Grafting onto Silicon Hydride. Appl. Sci. 2017, 7, 859.

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