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假塑性流体纳米压印中影响填充度的因素

夏委委 郑国恒 李天昊 刘超然 李冬雪 段智勇

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假塑性流体纳米压印中影响填充度的因素

夏委委, 郑国恒, 李天昊, 刘超然, 李冬雪, 段智勇

Factors influencing filling degree in nanoimprint lithography with pseudoplastic fluid

Xia Wei-Wei, Zheng Guo-Heng, Li Tian-Hao, Liu Chao-Ran, Li Dong-Xue, Duan Zhi-Yong
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  • 作为新一代的半导体加工工艺, 直接金属纳米压印以其步骤简单、成本低等显著优点得到迅速的发展. 然而目前纳米压印中所采用的转移介质在流动状态下为牛顿流体, 牛顿流体的黏度是一个常量, 而假塑性流体具有黏度随着剪切速率的增大而逐渐减小的趋势, 更适用于纳米压印. 综合假塑性流体的剪切稀化特性以及直接金属图形转移的优点, 将不同大小的金属纳米粒子分散在基液中制成假塑性金属纳米流体并将其作为转移介质用于纳米压印中. 基于假塑性流体的Carreau流变模型利用COMSOL软件仿真分析金属纳米粒子假塑性流体参数集对图形压印转移的影响, 完成假塑性流体与牛顿流体分别作为转移介质实现图形转移的对比分析. 同时还得到了压印过程中影响填充度的各个因素, 如流体黏度、施加压强、掩模板移动速度等. 研究工作为金属纳米粒子假塑性流体制备以及纳米压印流程的设计提供了理论基础.
    As a novel development of semiconductor process, direct metallic patterning has the advantages of simple steps, low cost, etc. However, almost all transfer media are Newtonian fluids in traditional nanoimprint lithography. Newtonian fluid viscosity is constant. Too high a viscosity is adverse to filling the small space, and if viscosity is too low, it is harmful to solidify graphics. So an appropriate viscosity range that can both realize a high filling degree and benefit solidification is difficult to determine. Pseudoplastic fluid viscosity decreases with the increase of shear rate. The problem would be solved well when pseudoplastic fluid is used as a transfer medium. Synthesizing the advantages of direct metallic patterning and pseudoplastic fluid feature, a novel idea is put forward. The pseudoplastic metal nanofluids, which would be fabricated with metal nanoprticals, can take the place of transfer medium in nanoimprint lithography. Based on the finite element method, COMSOL software is used to compute the filling degree of pseudoplastic fluid, and the results are compared with those of Newtonian fluid under the same conditions. Factors, such as viscosity, imprinting speed, pressure, etc., which would affect filling degree, can be obtained from simulation results. These parameters provide a theoretical basis for designing technological process and fabricating pseudoplastic fluids in future work.
    • 基金项目: 国家自然科学基金(批准号:51175479)资助的课题.
    • Funds: Project supported by the National Natural Science Foundation of China (Grant No. 51175479).
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  • [1]

    Chou S Y, Krauss P R, Renstrom 1995 Science 272 85

    [2]

    Chen L M, Guo Y F, Guo X, Tang W H 2006 Acta Phys. Sin. 55 6511 (in Chinese) [陈雷明, 郭艳峰, 郭熙, 唐为华 2006 物理学报 55 6511]

    [3]

    Li Z J, Lin H, Jiang X S, Wang Q K, Yin J 2010 Micronanoelectron. Tech. 47 179 (in Chinese) [李中杰, 林宏, 姜学松, 王庆康, 印杰 2010 微纳电子技术 47 179]

    [4]

    Hyunsik Y, Hye S C, KahpY, Kookheon C 2010 Nanotechnology 21 105302

    [5]

    Tang M J, Xie H M, Li Y J 2012 Chin. Phys. Lett. 29 098101

    [6]

    Harutaka M, Masaharu T 2009 J. Micromech. Microeng. 19 125026

    [7]

    Seung H K, Inkyu P, Heng P, Costas P G, Albert P P, Christine K L, Jean M J 2007 Nano. Lett. 7 1869

    [8]

    Chou S Y, Keimel C, Gu J 2002 Nature 417 835

    [9]

    Chen H L, Chuang S Y, Cheng H C 2006 Microelectron. Eng. 83 893

    [10]

    Yao C H, Hsiung H Y, Sung C K 2009 Microelectron. Eng. 86 655

    [11]

    Seung H K, Inkyu P, Heng P, Costas G P, Albert P P, Christine L K, Jean F M J 2007 Nano Lett. 7 1869

    [12]

    Harry R L D, Amy S C, Randy S P 2005 J. Micromech. Microeng. 15 2414

    [13]

    Xu S F, Wang J G 2013 Acta Phys. Sin. 62 124701 (in Chinese) [许少峰, 汪久根 2013 物理学报 62 124701]

    [14]

    Liu J P, Zhang X Y, Jia Q X, Yu C Z 2011 China Mech. Eng. 22 2415 (in Chinese) [刘剑平, 张新义, 贾庆轩, 于春站 2011 中国机械工程 22 2415]

    [15]

    Li T H, Zheng G H, Liu C R, Xia W W, Li D X, Duan Z Y 2013 Acta Phys. Sin. 62 068103 (in Chinese) [李天昊, 郑国恒, 刘超然, 夏委委, 李冬雪, 段智勇 2013 物理学报 62 068103]

    [16]

    Jeong J H, Choi Y S, Shin Y J 2002 Fiber. Polym. 3 113

    [17]

    Hirai Y, Fugiwara M, Okuno T 2011 J. Vac. Sci. Technol. B 19 2811

    [18]

    Yoshihiko H, Takaaki K, Takashi Y 2004 J. Vac. Sci. Technol. B 22 3288

计量
  • 文章访问数:  5440
  • PDF下载量:  492
  • 被引次数: 0
出版历程
  • 收稿日期:  2013-04-17
  • 修回日期:  2013-06-04
  • 刊出日期:  2013-09-05

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