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
[1]、K. C. Park, D. Y. Ma, K. H. Kim, “The physical properties of Al-doped zinc oxide films prepared by RF magnetron sputtering“, Thin Solid Films 305 (1997) 201-209 [2]、J. K. sheu, K. W. Shu, M. L. Lee, C. J. Tun, and G. C. Chi, “Effect of thermal annealing on Ga-doped ZnO films prepared by magnetron sputtering”, Journal of The Electrochemical Society. 154 (6) H521-H524 (2007) [3]、J. H. Bae, J. M. Moon, J. W.
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
,P.135 [5]、Hiromichi Ohta, Ken-ichi Kawamuram,Masahiro Orita, and Masahiro Hirano VOLUME 77,NUMBER 4 24 JULY (2000) [6]、S.
J. Jiao, Z. Z. Zhang, Y. M. Lu,D. Z. Shen, B. Yao, J. Y. Zhang, B. H. Li, D. X. Zhao, X. W. Fan, and Z. K. Tang, “ZnO p-n junction light-emitting diodes fabricated on sapphire substrates”, Appl. Phys. Lett. 88, 031911 (2006) [7]、S.B. Zhang, S.H. Wei, A. Zunger, "Intrinsic n-type versus p-type doping asymmetry and the defect physics of ZnO," Phys. Rev. B 63 (2001) 75205.
[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
”, 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.
[24]、D.L. Raimondi and E. Kay, J. Vac. Sci.Technol. 7 (1969) 96 [25]、P.Cao,D.X. Zhao, J.Y.Zhang, D.Z. Shen, Y.M. Lin, B. Yao, B.H.Li, Y.
Bai.X.W. Fan.Appl.Surface Sci. 254(2008)2900.
[26]、B. Yao,L.X. Guan,G.Z. Xing,Z.Z. Zhang, B.H.Li,Z.P. Wei, X.H. Wang, C.X. Cong, Y.P.Xie, Y.M. Lu, D.Z. Shen, J.Lumin. 122- 123 (2007)191.
[27]、J. Lu, Y. Zhang, Z. Ye, L. Wang, B.Zhao, J.Huang, Materials Lett .57(2003)3311 [28]、X.B. Zhang, Z. L. Pei, J. Gong, C. Sun, J.Appl.phys. 101(2007) 014910.