博碩士論文 992202021 詳細資訊

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姓名 莊曜滕(Yao-Teng Chuang)  查詢紙本館藏   畢業系所 物理學系
論文名稱 雜質在假晶型碳矽合金對張力之熱穩定性影響
(Effect of impurities on thermal stability of pseudomorphically strained Si:C layer)
★ 細菌地毯微流道中的次擴散動力學★ Role of strain in the solid phase epitaxial regrowth of dopant and isovalent impurities co-doped silicon
★ hydrodynamic spreading of forces from bacterial carpet★ What types of defects are created on supported chemical vapor deposition grown graphene by scanning probe lithography in ambient?
★ 以掃描式電容顯微鏡研究硼離子在矽基板中的瞬態增強擴散行為★ 應變及摻雜相互對以磷離子佈植之碳矽基板的固態磊晶成長動力學之研究
★ Revisiting the role of strain in solid-phase epitaxial regrowth of ion-implanted silicon★ 利用選擇性參雜矽基板在石墨稀上局部陽極氧化反應
★ Thermal stability of supersaturated carbon incorporation in silicon★ 氧化銅上的石墨烯在快速化學氣相沉積過程中的成核以及成長動力學
★ Reduction dynamics of locally oxidized graphene★ 微小游泳粒子在固定表面的聚集現象
★ Role of impurities in semiconductor: Silicon and ZnO substrate★ The growth of multilayer graphene through chemical vapor deposition
★ Characteristic of defect generated on graphene through pulsed scanning probe lithography★ non
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摘要(中) 我們藉由高解析x光繞射儀(HRXRD)及傅立葉轉換紅外線光譜(FTIR)來研究假晶型的碳矽合金在矽基板上的張應力熱穩定性的問題。為了產生夠大的張應力來提升電晶體的載子遷移數度,因此利用了非平衡方式突破碳元素在矽基板中的平衡溶解度來產生夠大的張應力。我們發現無論在只有碳元素的摻雜(C樣品)或多摻雜磷元素(CP樣品),張應力隨著後段加熱時間的拉長或溫度提升而釋放所保有的張應力,但在氮氣流通加熱的環境下全部張力釋放所需的熱處理條件卻遠低於前人研究需高溫加熱並以β-SiC析出的形成釋放張應力的條件,且CP樣品的全部張力釋放更是遠低於此條件。為了瞭解磷在CP樣品中如何影響張應力的消失,我們以動態模擬的方式來模擬張應力在HRXRD中量測各樣品中的分布趨勢並和(FTIR)做比較且探討張應力釋放的運動方式。從FTIR中我們發現晶格位置上的碳含量(607cm-1)並沒有太大的改變,且過渡帶的碳矽化合物(750cm-1)及β-SiC(810cm-1)的特徵訊號皆無變化,說明了張應力的釋放並非以晶格位置上的碳被置換或β-SiC形成而造成的。另外,我們比較了張力釋放和矽基板的氧化程度並發現兩者有著相似的趨勢的。因為碳元素是有良好的吸引並限制間隙元素的能力且二氧化矽的形成所造成的晶格擴大會產生多餘的間隙矽元素,因此我們推測系統並非以置換晶格位置上的碳元素或β-SiC形成的方式使張應力消失的原因是因為張應力以較低耗能的體積補償方式釋放。雖然在CP樣品中依舊有著和矽基板氧化相似的趨勢,但是張應力卻在表面摻雜磷元素的區域迅速消失,因此我們視磷元素在系統中為另為一種間隙元素來加速張應力的釋放。
摘要(英) We investigate the thermal stability of pseudomorphically strained Si:C layer after fully recrystallization using high resolution x-ray diffraction (HRXRD) and Fourier transform infrared (FTIR) spectroscopy. From HRXRD, the strain is relaxed with increasing post-annealing time or temperature as previous study, revealed almost complete strain relaxation in carbon incorporation (C sample). However, we found phosphorus doped Si:C (CP sample) far below the β-Si:C precipitation threshold under nitrogen flow ambient especially. The strain is well defined by HRXRD kinematic simulation in at least five layers concentration distribution and compared to FTIR spectroscopy analysis. Surprisingly, almost complete strain relaxation is found without significant substitutional carbon (Csub) loss (at 607 cm-1). The strain loss is strongly correlated to the Si-O bond (at 1100cm-1) formation and the P doped profile. The above observations indicate interstitial silicon injected by oxidation process and additional phosphorus atoms provide another strain relaxation pathway rather than previously thought mechanism of Csub kicked out from substitutional site and formed β-Si:C precipitation. The volume compensation by forming Csub interstitial complexes rather than Csub diffusing out from substitutional site during the thermal treatment is the most possibility mechanism, due to the fact that carbon is known to be strong gettering center. For CP sample, the interstitial phosphorus is proposed to be taken as additional interstitial source to promote the volume compensation. In summary, we find another pathway, namely the volume compensation, for strain relaxation in pseudomorphicallly strain Si:C alloy. The resultant process yields lower deactivation energy than the β-Si:C precipitation mechanism.
關鍵字(中) ★ 碳矽合金
★ 張力之熱穩定性
關鍵字(英) ★ phosphorus doped
★ silicon carbon
★ strain stability
論文目次 Contents
1. Introduction 1
2. Background 4
2.1 Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) 5
2.1.1 Scaling down of MOSFET 8
2.1.2 Generation of strain in Si as band structure engineering 10
2.2 Stability of non-equilibrium solid phase epitaxial regrowth 15
2.2.1 Characteristic of carbon 15
2.2.2 Stability of Si:C/Si non-equilibrium recrystallized 17
3. Experimental setup and measurement 20
3.1 Sample preparation 20
3.2 Experimental setup 24
3.3 Measurement methods 27
3.3.1 High resolution X-ray diffraction (HRXRD) 27
3.3.2 Fourier transform infrared spectroscopy (FTIR) 32
4. Result and Discussion 34
4.1 Stability of strain during post-annealing treatment 34
4.2 Characteristic vibration from FTIR 40
4.3 The mechanism of strain relaxation 42
5. Conclusions 47
6. Reference 49
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指導教授 溫偉源(Wei-Yen Woon) 審核日期 2012-6-29
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