氧硒化鋅合金的能隙結構

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姓名

賴麒文(Chiwen Lai) 查詢紙本館藏

畢業系所

物理學系

論文名稱

氧硒化鋅合金的能隙結構
(Band gap structure of ZnSeO alloys)

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摘要(中)

本論文利用光調製反射光譜與光激發螢光光譜來分析氧硒化鋅合金的直接能隙，氧濃度為0~0.07。在室溫下，能隙隨著氧濃度上升會大幅度地縮小，此結果符合能帶互斥理論。在溫度150~300K的範圍內，由能帶互斥理論推算出的氧濃度與X光繞射實驗的結果相近。然而，在低溫10~150K的範圍內，出現了能隙隨溫度變化趨勢增大的現象，變化趨勢往主材料硒化鋅接近，而偏離了能帶互斥理論。實驗結果在低溫偏離能帶互斥理論的現象，可能與氧硒化鋅合金之局域態特性所造成的影響有關。

摘要(英)

This thesis mainly focuses on the direct band gap analysis of ZnSe1-xOx alloys (x=0~0.07) through photoreflectance (PR) spectroscopy and photoluminescence (PL) spectroscopy. The band gap of alloys decreases significantly with increasing oxygen concentration at room temperature, which agrees with the band anticrossing model (BAC). In higher temperature range (150~300K), the BAC model well predicts the oxygen concentration which consists with experimental results under X-Ray diffraction (XRD) examination. However, when the temperature is under 150K, BAC model underestimates the drastic band gap tendency which is closer to the behavior of the host material ZnSe. This deviation from BAC model may associate with the localized state properties of ZnSe1-xOx alloys.

關鍵字(中)

★ 氧硒化鋅
★ 硒化鋅

關鍵字(英)

★ ZnSeO
★ ZnSe

論文目次

摘要 ...............................................i
Abstract .........................................ii
致謝 .............................................iii
目錄 ..............................................iv
圖目 ..............................................vi
第一章簡介 ........................................1
第二章能隙結構 .....................................3
2-1 氧硒化鋅的能隙結構介紹 ............................3
2-2 虛擬晶格近似法 .................................4
2-3 能帶互斥理論 ...................................6
第三章實驗樣品與實驗裝置 ............................12
3-1 實驗樣品介紹 ..................................12
3-2 光調製反射光譜實驗 .............................14
3-3 光激發螢光光譜實驗 .............................17
第四章實驗結果與討論 ...............................19
4-1 室溫光譜 .....................................19
4-2 變溫光譜 .....................................23
4-2-1 變溫光調製反射光譜 ...........................23
4-2-2 變溫光激發螢光光譜 ...........................35
第五章結論 .......................................47
參考文獻 ..........................................48

參考文獻

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指導教授

徐子民(Tzu-Min Hsu)

審核日期

2011-7-5

推文