沉積金在Si(111)表面上的兩種圖樣轉變之探討

Transition between two patterns on an Au-deposited Si(111)surface

白尚永(Shang-Young Pai)

指導教授 ： 門福國

國立中正大學/理學院/物理學系/碩士(2012年)

摘要

在實驗中將金磊晶至有微小切角之Si(111)-(7×7)表面會出現兩種不同的圖形
樣式。若在600℃磊晶時，我們發現幾乎在每個平台之上台階處會有條狀之(5×2)重
構。若在700℃磊晶時，則只會在多個平台其中之一的平台表面形成完整的(5×2)重
構，而其他平台則無變化。(5×2)及(7×7)平台之比例關係是由金之磊晶量所決定。
在700℃以上熱退火後，條狀(5×2)圖樣轉變為完整之(5×2)平台圖樣。在特定條件
下(5×2)重構會呈現類似週期性結構的圖樣，表示其中可能有ㄧ long-range elastic
interaction 的機制在其中。我們可以利用(5×2)的成長圖樣應用在設計奈米結構之
模板。

關鍵字

金 ； 矽 ； 5x2 ； 7x7

並列摘要

Two distinct patterns have been observed by depositing sub-monolayer Au onto a
Si(111)-(7×7) surface with a small miscut angle. Upon depositing Au at 600℃, we find
that a stripe of (5×2) reconstruction forms at the upper step edge in mostly every terrace.
For 700℃ deposition, one entire terrace out of several terraces transforms into the (5×2)
reconstruction while the other terraces are totally unaffected by the Au deposition. The
relative population between the (5×2) and the (7×7) terrace is governed by the amount of
deposited Au. After annealing at a temperature above 700℃ the striped (5×2) pattern
transforms, or grows, into the (5×2)-terrace pattern. In a given condition, (5 × 2)
reconstruction show a periodic-like pattern, there may have a mechanism of long-range
elastic interaction incuded. One application using the (5×2) pattern as a template to grow
nanostructure in designated regions will be demonstrated.

並列關鍵字

gold ； silicon ； Au ； Si ； ripening ； long range interaction

參考文獻

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