氧化鋅及氧化鋅摻雜鎂陣列奈米柱之光學性質

Optical properties of well-aligned ZnO and Zn1-xMgxO nanorods

張鈺聲(Yu-Sheng Chang)

指導教授 ： 陳俊維

國立臺灣大學/工學院/材料科學與工程學研究所/碩士(2005年)

https://doi.org/10.6342/NTU.2005.02406

摘要

本論文主要研究MOCVD在矽(100)基板上合成的高品質氧化鋅及氧化鋅摻雜鎂奈米柱之光學性質。由SEM、XRD和光譜分析，可知其為高品質低雜質之奈米結構。而由室溫到25k之變溫光激發光譜分析中，可以發現氧化鋅摻雜鎂奈米柱是由LX1(localized exciton)及LX2所主導，隨著鎂的濃度增加LX2的放光佔總放光之比例隨之增加，此意味著LX2為鎂原子侷限自由激子所產生的束縛激子放光。且由於摻雜鎂使得晶格排列較不整齊(disorder)，產生應力不平均或缺陷，造成放光有變寬之趨勢。而在光偏極性的實驗裡，發現氧化鋅及氧化鋅摻雜鎂奈米柱皆有線性偏極之現象，平行於長軸之發光強度越強。這意味著氧化鋅及氧化鋅摻雜鎂奈米柱皆為好的光學材料，且藉由改變鎂的濃度，可以控制偏極光之能量大小。

關鍵字

氧化鋅 ； 氧化鎂 ； 光學性質 ； 光激發光

並列摘要

High-quality well-aligned ZnO and Zn1-xMgxO nanorods were grown on Si(001) substrates by using metalorganic chemical vapor deposition. The temperature dependent and polarized behavior of photoluminescence observed in well-aligned ZnO and Zn1-xMgxO nanorods in the temperature range of 25-295k is described. luminescence was dominated by localized excitons LX1 and LX2 in Zn1-xMgxO nanorods. With increasing Mg content LX2 became dominated the luminescence in low temperature. And increasing Mg content also influenced the luminescence to be boarding. It is found that both ZnO and Zn1-xMgxO nanorods were strongly polarized along the long axis. This indicated that ZnO and Zn1-xMgxO nanorods had high optical quality and with changing Mg content we can control deferent energies emissions with strongly polarized.

並列關鍵字

zno ； mgo ； PL ； optical

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