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Stable Hydride-Structures on Si(111) Surface in Pure Water

Published online by Cambridge University Press:  21 February 2011

Satoru Watanabe,
Key Horiuchi and
Takashi Ito
Satoru Watanabe
Affiliation:
Fujitsu Laboratories Ltd. 10-1 Morinosato-Wakamiya, Atsugi 243-01, Japan
Key Horiuchi
Affiliation:
Fujitsu Laboratories Ltd. 10-1 Morinosato-Wakamiya, Atsugi 243-01, Japan
Takashi Ito
Affiliation:
Fujitsu Laboratories Ltd. 10-1 Morinosato-Wakamiya, Atsugi 243-01, Japan
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Abstract

We investigated the hydride structures at the step edges on Si( 111) surfaces after removing surface oxide by HF solution, followed by immersion in boiling water, by using polarized infrared attenuated total-reflection spectroscopy. Vicinal (111) surfaces misoriented toward the [112] direction at angles of 0°, 2°, and 4° were used to know the hydride structures at the steps. We assigned absorption peaks as monohydride chains at the step edges along the [110] direction, vertical dihydride (whose three atoms make a surface vertical to [111]) at the kinks, and monohydride on the terraces. We determined that the silicon monohydride chain forms an atomically straight step edge along the [110] direction with a small amount of vertical dihydride kinks after 5-min immersion in boiling water. Only the monohydrides on the terraces and the mohydride chains are stable on vicinal (111) surface in pure water.

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References

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