博碩士論文 953208009 詳細資訊




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姓名 張琪芬(Chi-Fen Chang)  查詢紙本館藏   畢業系所 能源工程研究所
論文名稱 利用化學水浴沉積法製作Ni-ZnO光電極之研究
(The Investgation of Producing Ni-ZnO Thin Film by Chemical Bath Deposition Method)
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摘要(中) 本研究主要探討氧化鋅薄膜摻雜不同濃度Ni2+離子時,於不同參數條件下對吸收度及光電流之影響。實驗以化學沉積水浴沉積法(CBD)進行鍍膜之方式,其優點在於成本低、低溫操作且製程簡單容易。由於氧化鋅薄膜屬於寬能隙,無法在可見光之波段被吸收,故藉由掺雜Ni2+離子,增加中間能隙之位置,有利增加太陽光的吸收,而提升光電流。
實驗中,首先先探討各種變因對純氧化鋅之影響,取出最佳參數條件後,再進行Ni2+離子之摻雜,Ni2+離子摻雜量分別為4%、6%、8%及10%,觀察在不同參數條件下,其薄膜結構、吸收光譜與光電流性質之影響。本研究發現當R=2.25、pH=13、沉積溫度為70℃、沉積時間與方式為分次沉積1h且共沉積3次後熱處理一次,總共沉積9 times (熱處理3次)後,並於熱處理溫度為450℃、熱處理時間為2h (升降溫速率為3℃/min)時,以摻雜0.01M 8% Ni之參數條件下之吸收度與光電流為最高,其吸收度可達約1.2以上,而光電流在固定偏壓0.3V下,也可達到約0.20 mA/cm2。
摘要(英) In this study, the influence of Ni2+ concentration doped on the absorbance and photocurrent of the ZnO thin films under different parameters is investigation. The ZnO thin films were prepared by chemical bath deposition (CBD) method, which has several advantages such as : lower cost, low temperature operation, and simple process. Since the undoped-ZnO films have a large energy gap of 3.2eV, they can not absorb the visible light. In order to enhance the absorption of the visible light and promote the photocurrent, Ni2+ ions are doped into ZnO films to add the middle energy gap.
In the experiment, the influence of various kinds of parameter on the properties of undoped-ZnO is investigated to obtain the optimal working parameters. Under this optimal condition, films are doped with Ni2+ ion of 4%, 6%, 8% and 10%, respectively. The properties of the films like morphology, absorbance and photocurrent characteristic are observed and analyzed. For experiment results, it is found that the optimal condition occurs when R is 2.25, pH is 13, the bath deposition temperature is 70℃, the total bath deposition time is 9h within which a 1h deposition is repeated and heat treatment is performed at every 3h, heat treatment temperature is 450℃, and haet treatment time is 2h with increasing and decreasing temperature rate of 3℃/min. The ZnO films doped with 0.01M 8% Ni2+ in above parameters has the best absorbance and photocurrent values. The maximun absorbance can reach 1.2 above, and the maxinum photocurrent value can also reach 0.02 mA/cm2 when the bias potential was 0.3 V.
關鍵字(中) ★ 光電流
★ 吸收度
★ 摻雜
★ 能隙
★ 化學水浴沉積法
關鍵字(英) ★ chemical bath deposition (CBD)
★ photocurrent
★ absorbance
★ band gap
★ doped
論文目次 中文摘要……………………………………….…….…….………...….……….I
Abstract…………………………………………….……………...…..…….…..II
目錄…………………………………...……………….…………..…….….….III
表目錄…………………………………...……………….……….….…….…..VI
圖目錄…………………………………………………….……………….…..VII
符號說明……………………………………………………………………..XIV
第一章 緒論……………………………………………...……….…………….1
1-1 前言………………………………...…………………….…………….1
1-2 太陽光電解水製氫原理……………...………………….…………….3
1-3 氧化鋅光觸媒………………..............……………….………………..5
1-3-1 氧化鋅製備方法……………...………………..………………..5
1-3-2 氧化鋅之薄膜製程…………………………..………………….6
1-4 化學水浴沉積法(Chemical Bath Deposition,CBD)…………………..7
1-4-1 化學水浴沉積法基本化學反應機制…………………………...8
1-4-2 化學水浴沉積法沉積氧化物之化學反應機制……………….10
1-4-3 均質成核與異質成核……………………………..…………...11
1-4-4 薄膜沉積成長與溶解度之關係……………………………….12
1-5 文獻回顧……………………………………………………………...13
1-6 研究動機與目的……………………………………………………...15
第二章 實驗步驟及研究方法………………………………………………...17
2-1 實驗流程與參數設定…………...…………………...……………….17
2-2 實驗材料及儀器……………………………………...………………17
2-2-1 化學藥品……………..………………………...………………17
2-2-2 透明導電基材………..……...………………...……………….19
2-2-3 實驗儀器………..……………………………...……………....19
2-3 化學水浴沉積法製作光電極之實驗步驟...........................................20
2-4光電極之量測………..……………...………………….………….......22
2-4-1 紫外光/可見光(UV/Vis)吸收光譜儀之量測………...………..22
2-4-2 光電流之量測..……………………………………...………....23
2-4-3 X光繞射分析之量測………………………………....…….......23
2-4-4 掃描式電子顯微鏡(SEM)/能量散射光譜儀(EDS)之量測…...24
第三章 實驗結果與討論………..…………………...………………………..25
3-1 不同錯合劑比鋅離子之莫耳比的影響………...……..……...……...26
3-2 不同物理參數對純氧化鋅薄膜形成與吸收度之影響.…….…..…...29
3-2-1 沉積溫度之影響………...…….……………...………………..29
3-2-2 沉積時間之影響………...…….……………...………………..30
3-2-3 pH値之影響………...…….…………………...……....………..31
3-2-4 熱處理溫度之影響…….……………………...…...…………..32
3-3 不同物理參數對摻雜鎳離子氧化鋅薄膜(Ni-doping ZnO)之吸
收度及光電流特性影響……………………....……..................……..32
3-3-1 熱處理溫度之影響……………………………………...…..…32
3-3-2 沉積方式之影響……………………..………………...………33
3-3-3 鎳離子濃度之影響……………………..……………...………34
3-3-4 浴鍍次數之影響……………………………….….…………...36
3-3-5 熱處理升降溫速度之影響…………………….….…………...39
第四章 結論…………………………..……………………………………….40
參考文獻…………………………..……………………………………...……42
表…………………………………..……………………………………...……48
圖…………………………………..……………………………………...……52
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指導教授 洪勵吾(Lih-Wu Hourng) 審核日期 2008-6-26
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