非酸化,メチル終結シリコンナノワイヤの電気的特性および化学的安定性
Hossam Haick1, Patrick T Hurley, Allon I Hochbaum
1Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 127-72, 1200 East California Boulevard, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|July 13, 2006
まとめ
結合的に機能化されたシリコンナノワイヤ (Si NWs) は,優れた大気安定性と高性能を提供します. これらの改造されたSi NWは,より優れたオンオフ比率を持つ頑丈で空気に安定したフィールド効果トランジスタ (FET) の作成を可能にします.
科学分野:
- 材料科学 材料科学とは
- ナノテクノロジー ナノテクノロジー
- 半導体物理学 半導体物理学
背景:
- シリコンナノワイヤ (Si NWs) は,電子機器にとって有望ですが,表面酸化と不安定に苦しむことがよくあります.
- 安定で高性能なSi NWベースの電子機器を達成するには,効果的な表面受動化戦略が必要です.
研究 の 目的:
- 結合性Si-CH3群で機能化されたシリコンナノワイヤの大気安定性と電子特性を調査する.
- これらの改造されたSi NWを使用したフィールド効果トランジスタ (FET) の製造と性能を実証する.
主な方法:
- Si NWの表面をメチル (CH3) グループで共性的に改変し,中間の酸化物層を排除する.
- 機能化されたナノワイヤを使用したSi NWフィールド効果トランジスタ (FET) の製造.
- 環境条件下におけるSi NW FETの電気的特徴.
主要な成果:
- Si-CH3機能化されたSi NWは,劣化することなく驚くべき大気安定性を示した.
- 高伝導度値と,表面欠陥レベルが著しく低下したことが観察されました.
- 空気安定性Si NW FETは成功裏に製造され,オンオフ比が10^5.5を超えた.
- トランジスタは, +/-2 V の小さなゲート電圧の振動で効果的に動作しました.
結論:
- 配合性Si-CH3機能化は,シリコンナノワイヤの有効な受動化を提供し,その安定性と電子性能を高めます.
- このアプローチにより,電子アプリケーション用の非常に安定で効率的なSi NWフィールドエフェクトトランジスタの開発が可能になります.
- 結果は,環境環境で堅固なシリコンナノワイヤベースのデバイスを実現するための実行可能な経路を強調しています.
関連する概念動画
03:06Alkali Metals
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
02:18Network Covalent Solids
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To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
03:18Nuclear Stability
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02:58Properties of Transition Metals
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
01:08Covalent Bonds
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally, creating polar bonds.
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally, creating polar bonds.
01:29Electrical Transport
The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...