以射頻磁控濺鍍方式鍍製含氫微晶矽薄膜並探討其應用於薄膜太陽能電池之可能性

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韓嘉緯(Jia-wei Han) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

以射頻磁控濺鍍方式鍍製含氫微晶矽薄膜並探討其應用於薄膜太陽能電池之可能性
(Fabrication of Hydrogenated microcrystalline Silicon Thin Films Using RF Magnetron Sputtering)

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摘要(中)

由於含氫之微晶矽薄膜比非晶矽薄膜的電性更佳，因而受到重視。製作含氫之微晶矽薄膜目前之主流製程為以電漿輔助之化學氣相沈積法(PECVD)。但PECVD的缺點在於設備成本高，且使用SiH4等有毒氣體。然而以射頻磁控濺鍍法來製作則可免除這些缺點，但很不幸地，一般以射頻磁控濺鍍法所製作出的都是非晶矽。因此本研究中，希望在較低之基板溫度條件下(Ts=250 ℃)，能使用氫氣混入氬氣之方式鍍製出含氫之微晶矽薄膜。吾對於以不同氫氣流量、電源功率和基板溫度所製作出之薄膜進行晶粒大小、結晶比例和電性(暗導電率、光導電率、光導電率和暗導電率之比值photosensitivities)之量測分析。實驗結果顯示，晶粒大小、結晶比例和導電率會隨著氫氣流量的增加而增加，而photosensitivities卻相對減少；當氫氣流量達到適量時，晶粒大小可達20nm，結晶比例可達到80%以上。

摘要(英)

Hydrogenated microcrystalline silicon (μc-Si:H ) thin films have attracted many attentions due to the high mobility compared with the amorphous silicon (a-Si) thin films. To fabricate μc-Si:H thin films plasma-enhance chemical vapor deposition (PECVD) is the most popular method. The disadvantages of PECVD are the high facility cost and using the toxic processing gases such as silane (SiH4). Whereas there is no these disadvantages using radio-frequency (RF) magnetron sputtering to deposit silicon thin films. Unfortunately, the silicon thin films deposited by the regular RF magnetron sputtering are a-Si. In this study, μc-Si:H thin films were fabricated using RF magnetron sputtering with argon and hydrogen as working gas at low substrate temperature (Ts=250℃). The grain sizes, crystal volume fractions and photosensitivities (ratios of dark conductivities and photo conductivities) of the μc-Si:H thin films which deposited with different hydrogen partial pressures and sputtering powers were analyzed. The results showed that the grain sizes and the crystal volume fractions were increased and the photosensitivities were decreased as the hydrogen gas flow increased. The grain sizes were between 15 to 20 nm and the crystal volume fractions were between 75 to 80% at high hydrogen gas flow .

關鍵字(中)

★ 太陽能電池
★ 物理氣相沈積法
★ 微晶矽

關鍵字(英)

★ microcrystalline Silicon
★ PVD
★ Solar cell

論文目次

圖目錄 VII
表目錄 IX
第一章緒論 1
1-1前言 1
1-2太陽能電池及其運作原理 3
1-2-1薄膜太陽能電池構造 5
1-3研究動機與目的 7
第二章理論基礎及文獻回顧 10
2-1物理氣相沈積法 10
2-2濺鍍原理 11
2-2-1電漿原理 11
2-2-2射頻反應式磁控濺鍍原理 12
2-3製作多晶矽薄膜之方式 14
2-3-1固相結晶法 14
2-3-2準分子雷射退火法 15
2-3-3金屬誘發結晶法 17
2-3-4直接沈積多晶矽薄膜 17
2-4直接沈積微晶矽薄膜之機制 18
2-4-1氫對成長多晶矽薄膜之影響 18
第三章實驗步驟與研究方法 20
3-1實驗流程 20
3-2實驗設備 21
3-2-1實驗用氣體與材料 21
3-2-2鍍膜儀器設備 21
(a)射頻磁控濺鍍系統 21
3-3實驗步驟 22
3-4量測分析儀器 24
3-4-1表面輪廓儀 24
3-4-2 X光繞射儀 24
3-4-3拉曼光譜儀 26
3-4-4傅立葉轉換紅外線光譜儀 28
3-4-5日光模擬光源/四點探針/微電流計 28
第四章實驗結果與討論 29
4-1膜厚、厚度均勻性、鍍膜速率 29
4-2在200W；250℃參數下，直接沈積微晶矽薄膜 31
4-2-1矽氫鍵結 31
4-2-2結晶特性 33
4-2-3薄膜電性 37
4-3在200W；350℃參數下，直接沈積微晶矽薄膜 39
4-3-1矽氫鍵結 39
4-3-2結晶特性 40
4-3-3薄膜電性 43
4-4在400W；250℃參數下，直接沈積微晶矽薄膜 44
4-4-1矽氫鍵結 44
4-4-2結晶特性 45
4-4-3薄膜電性 48
4-5薄膜光劣化現象之探討 50
第五章結論 51
參考文獻 52

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指導教授

李正中(Cheng-chung Lee)

審核日期

2007-7-23

推文