采用电子回旋共振等离子体化学气相沉积(ECR-CVD)技术,以CH_4和H_2为源气体,硅片为衬底制备了碳膜.利用拉曼光谱仪和扫描电子显微镜成功研究了基板偏压、沉积时间、CH_4浓度等工艺参数的改变对碳膜絮状结构的影响.通过分析碳膜结构和形貌,得出纳米絮状碳膜的最佳工艺参数.通过电流密度-电场(J-E)曲线和Fowler-Nordheim(F-N)曲线,研究了CH_4浓度对纳米絮状碳膜的场发射特性的影响.随着CH_4浓度的增加,碳膜的阚值电场逐渐降低,发射电流密度逐渐增加.
Nano-catkin films were prepared on Si substrates by means of electron cyclotron resonance microwave plasma chemical vapour deposition method in a hydrogen and methane mixture. The influences of substrates bias, CH4 concentration and deposition time on the nano-catkin structure of carbon film were investigated by Raman spectroscopy and scanning electronic microscope, respectively. The optimal deposition conditions were obtained by ana-lyzing the images of nano-catkin film. The field emission characteristics were analyzed by using the current density versus electric field(J-E) curves and Fowler-Nordheim(F-N)curves. The threshold electric field of nano-catkin carbon films was reduced with increasing the CH_4 concentration, at the same time emission current density was increased.
参考文献
[1] | Yamamoto A,Tsutsumoto T.Piezoresistive effect of CVD polycrystalline diamond films[J].Diamond and Related Materials,2004,13(4-8):863-866. |
[2] | Davies A R,Field J E.The solid particle erosion of free-standing CVD diamond[J].Wear,2002,252(1-2):96-102. |
[3] | 邱东江,石成儒,吴惠桢.石英衬底上生长的高光学质量的纳米金刚石薄膜[J].物理学报.2002,51(8):1870-1874. |
[4] | 陈婷,郭平生,王莉莉,等.表面形貌特殊的碳纳米管薄膜及其场发射增强[J].液晶与显示,2007,22(3):287-292. |
[5] | Ulmen B,Kayastha V K,DeConinek A,et al.Stability of field emission current from various types of carbon nanotube films[J].Diamond and Related Materials,2006,15(2-3):212-216. |
[6] | Srivastava S K,Shukla A K,Vankar V D,et al.Growth,structure and field emission characteristics of petal like carbon nano-structured thin films[J].Thin Solid Films,2005,492(1-2):124-130. |
[7] | Obraztsov A N,Zakhidov A A,Volkov A P,et al.Non-classical electron field emission from carbon materials[J].Diamond and Related Materials,2003,12(3-7):446-449. |
[8] | Zhang W J,Wu Y,Wong W K,et al.Structuring nanodiamond cone arrays for improved field emission[J].Appl.Phys.Lett.,2003,83(16):3365-3368. |
[9] | Wang W H,Lin Y T,Kuo C T.Nanofabrication and properties of the highly oriented carbon nanocones[J].Diamond and Related Materials,2005,14(3-7):907-912. |
[10] | Lee Y C,Pradhan D,Lin S J,et al.Effect of surface treatment on the electron field emission property of nano-diamond films[J].Diamond and Related Materials,2005,14(11-12):2055-2058. |
[11] | Subramanian K,Kang W P,Davidson J L,et al.Enhanced electron field emission from mieropatterned pyramidal diamond tips incorporating CH《,4》/H_2/N_2 plasma-deposited nanodiamond[J].Diamondand Related Materials,2006,15(4-8):1126-1131. |
[12] | Wang J J,Zhu M Y,Outlaw R A,et al.Free-standing subnanometer graphite sheets[J].Appl.Phys.Lett.,2004,85(7):1265-1267. |
[13] | Wang J Y,Toshimichi Ito.CVD growth and field emission characteristics of nano-structured films composed of vertically standing and mutually intersecting nano-carbon sheets[J].Diamond and Related Materials,2007,16(3):589-593. |
[14] | Zhang Y B,Lau S P,Huang L,et al.Carbon nanotubes synthesized by biased thermal chemical vapor deposition as an electron source in an x-ray tube[J].Appl.Phys.Lett.,2005,86(12):123115(1-3). |
[15] | 顾广瑞,吴宝嘉,金逢锡,等.石英管型MWPCVD法制备的纳米针状结构碳膜的场发射特性[J].液晶与显示,2007,22(5):535-539. |
[16] | Li J J,Gu C Z,Peng H Y,et al.Field emission properties of diamond-like earbon films annealed at different temperatures[J].Appl.Surf.Sci.,2005,251(1-4):236-241. |
[17] | Li J J,Gu C Z,Wang Q,et al.Field emission from high aspect ratio tubular carbon cones grown on gold wire[J].Appl.Phys.Lett.,2005,87(14):143107(1-3). |
[18] | Wang J Y,Teraji T,Ito T.Fabrication of wrinkled carbon nano-films with excellent field emission characteristics[J].Diamond and Related Materials,2005,14(11-12):2074-2077. |
[19] | Xu J,Li X,Mei J,et al.The effect of hydrogen dilution on the field emission from hydrogenated amorphous carbon films[J].Solid State Communications,2004,129(8):497-500. |
[20] | Langmuir I.The effect of space eharge and initial velocities on the potential distribution and thermionie current between parallel plane electrodes[J].Phys.Rev.,1923,21:419-435. |
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