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E-mail: [email protected] RTCVD透明半導體薄膜光電特性研究吳昌任、范榮權、李得勝

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RTCVD透明半導體薄膜光電特性研究 吳昌任、范榮權、李得勝

E-mail: [email protected]

摘 要

我們利用(Rapid-Thermal Chemical Vapor Deposition)RTCVD成長ZnO透明半導體,所使用的基板是康寧玻璃,在不同的腔 體溫度下成長透明半導體薄膜,工作壓力約在5 Torr 左右,比較其差異性。氧化鋅薄膜在可見光範圍之穿透率可達到75%

以上, X-ray儀器量測下,在34.4度有一個peak值,為C軸成長結構(002)面,原子力顯微鏡Atomic Force Microscope (AFM)

,觀察樣品平整度為350度最佳,場發掃描式電子顯微鏡Field Emission Scanning Electron Microscopy (FE-SEM) ,主要觀察 薄膜厚度約40nm,在實驗中,測量熱激發電流效應,所推算出的活化能,接近氧化鋅激子束縛能60meV,樣品以成長溫 度350oC為最佳和電阻率0.1621Ω cm為最小。

關鍵詞 : 氧化鋅、快速升溫化學氣相沈積系統、薄膜光電特性 目錄

封面內頁 簽名頁 中文摘要....................... iii 英文摘要.............

..........iv 誌謝.........................vi 目錄............

.............vii 圖目錄.........................ix 表目錄.......

.................. xi 第一章 緒論 1.1 前言與研究目的...............1 1.2 氧化 鋅薄膜(zinc oxide thin films,ZnO)的介紹..2 1.2.1 光電性質................3 第二章 實驗方法與步 驟 2.1 實驗流程..................5 2.2 實驗材料..................7 2.3 實驗 裝置..................8 2.4 鍍膜參數及步驟...............9 2.4.1鍍膜參數..

..............9 2.4.2基座清洗............... 10 2.4.3 沉積ZnO薄膜.......

......10 2.5 薄膜性質測試與應用分析 2.5.1 X-Ray繞射研究............ 11 2.5.2原子力顯微鏡(AFM) 圖像之分析..... 12 2.5.3光穿透率量測............. 13 2.5.4 X射線能量散佈分析儀.......

..15 2.5.5熱激發電流.............. 17 2.5.6 Van Der Pauw量測........... 24 2.5.7霍爾 量測原理............. 26 第三章 結果與討論 3.1 ZnO薄膜結構、表面形貌與組成之研究 3.1.1 製成參數對 薄膜結構造成的影響....32 3.1.2 製成參數對表面形貌造成的影響....35 3.2 製程參數對ZnO薄膜光電特性之影響

....44 3.2.1 製程參數對熱激發電流效應的影響 ...53 第四章 結論....................55 參考文獻.......................56

參考文獻

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Kang, H. D. Park, J. J. Kim, W. J. Cho, and H. K. Kima, “Transparent, Low Resistance, and Flexible Amorphous ZnO-Doped In2O3 Anode Grown on a PES Substrate”, Journal of The Electrochemical Society, 154 (3) J81-J85 (2007) [4]、楊明輝;工業材料雜誌,第265期2009年1月

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[8]、S. Major, Satyendra Kumar, M. Bhatnagar, and K. L. Chopra, “Effect of hydrogen plasma treatment on transparent conducting oxides”, Appl. Phys. Lett. 49, 394 (1986).

[9]、S.H.Jeong, J.H.Boo, “InFluence of target-to-substrate distance on the properties of AZO films grown by RF magnetron sputtering”, Thin Soild Films 447-448 (2004) 105-110 [10]、H. L. Hartnagel, A. K. Jain and C. Jagadish, “Semiconducting Transparent Thin Films”, published by Institute of Physics Publication, 1995, Chap. 3.

[11]、B. Lin, Z. Fu, Y. Jia, “Green luminescent center in undoped zinc oxide ?lms deposited on silicon substrates”, Appl. Phys. Lett., 79, 943 (2001) [12]、I. Hamberg, C. G. Granqvist, K. -F. Berggren, B. E. Sernelius, and L. Engstrom, “Band-gap widening in heavily Sn-doped In2O3

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”, Phys. Rev. B 30, 3240 - 3249 (1984) [13]、彭子安,私立大葉大學,電機工程學系,碩士論文 2009 [14]、J.I. Pankove, Optical Processes in Semiconductors, Prentice-Hall, Englewood, (1971) [15]、曾浩恩,國立清華大學,化學工程研究所,碩士論文,2004.

[16]、邱寬城,私立中原大學,應用物理研究所,碩士論文,2005.

[17]、D. C. Look, Semiconductors and Semimetals edited by R. K. Willardson and A. C. Beer, (Academic, New York, 1983), Vol. 19, Chap. 2.

[18]、N S YuKseK, N M Gasanly and H Ozkan semicond. Sci, Technol. 18(2003) 834-838 [19]、美國國家標準和技術院(National Institute for Standards and Technology, NIST) [20]、李志晃,私立大葉大學,電機工程學系,碩士論文,2007.

[21]、Lake Shore, Hall Effect Electronic Transport Measurement System, (2001) [22]、郭益男,國立中山大學電機工程學系,碩士論文2004 [23]

、I. Kim, K. Lee, T.S. Lee, J. Jeong, B.Cheong, Y. Baik and W.M Kim, J. Appl. Phys. 100 (2006) 063701.

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參考文獻

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