研究生: |
鄭燕宗 Zheng, Yan-Zong |
---|---|
論文名稱: |
SiGe/Si 介面應變場之X光表面三光繞射研究 Investigation of Interfacial Strain Field in SiGe/Si Systems Using Bragg-Surface X-ray Diffraction |
指導教授: |
張石麟
Chang, Shih-Lin |
口試委員: | |
學位類別: |
碩士 Master |
系所名稱: |
理學院 - 物理學系 Department of Physics |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 68 |
中文關鍵詞: | SiGe/Si |
相關次數: | 點閱:2 下載:0 |
分享至: |
查詢本校圖書館目錄 查詢臺灣博碩士論文知識加值系統 勘誤回報 |
Interfacial strain in multi-layer materials play a very important role in affecting the device performance, such as the yield of semiconductor electronic devices and the output power of solar-energy batteries. Here we report on the studies of interfacial strain in the SiGe/Si sample system using the so-called Bragg-surface three-beam diffraction. A CCD(Charge Coupled Device) is employed to monitor the image of the surface diffracted beam as a function of the Bragg angle θ and azimuth angle ϕ of rotation around the interface normal. The latter also reflects the effective depth of surface X-ray propagation according to the dynamical theory of diffraction. Consequently, the interfacial strain versus effective depth can be mapped out. It is found that the interfacial strain field is mainly affected by the growth direction of thin layers and the crystal lattice type of the substrate. The closer to the interface the larger the strain.
現今的多層材料中,當兩種不同晶體的晶格常數相當接近時,其介面將會因為兩種晶體的連結造成此處的晶格常數有所變化,而晶格常數的變化,在許多材料應用中,常會發生問題,例如在太陽能電池的光轉率不好等等,因此若能有效掌握此變化量,將可對此問題提供重要資訊。在本碩士論文中,主要探討應變場(strain field)在SiGe/Si的介面對於晶格的變化。在實驗部分,我們利用電荷耦合元件(Charge Coupled Device)去拍攝各種不同角度的繞射圖形,在數據分析部分,我假設在每組ϕ-scan中強度最強的地方為參考原點,利用此點及繞射幾何去計算其晶格常數的變化,並將計算出的晶格常數,分別對θ、ϕ、X光穿透深度作圖。由這些圖形進一步分析應變場的分佈情況,最後得到三個重要的結論,其一,長晶的方向將影響應變場的大小,其二,晶體的特性將影響應變場的分布情形,其三,接近介面的地方,由於應變場較大,因此,晶格常數成震盪變化。
[1] 〖Stetsko〗^a,Y. P. and 〖Chang〗^(b,c*),S.-L.,Acta Cryst. (1997). A53, 28-34
[2]邱茂森,(2008)”X光共振腔之24光動力繞射計算”,國立清華大學博士論文
[3]蔡一葦,(2007)”β-Fe〖Si〗_2/Si量子點應變場之X光繞射研究”,國立清華大學碩士論文
[4]Chang, S.-L. and Tang, M.-T.,Acta Cryst. (1988). A44, 1065-1072
[5] Souvouov ,A. and Ishikawa ,T. and Nikulin, A.Y and Stetsko ,Y.P. and Chang, S.-L and P. Zaumseil (2004)Phys. Rev. B70,224109