物理化学学报 >> 2023, Vol. 39 >> Issue (10): 2306038.doi: 10.3866/PKU.WHXB202306038

所属专题: 北大纳米化学研究中心30周年专刊

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光刻胶辅助的石墨烯晶圆无损转移

廖珺豪1,2,3,4, 赵一萱1,3, 胡兆宁3,5, 补赛玉5, 陆琪3,6, 尚明鹏1,2,3, 贾开诚3, 裘晓辉4,*(), 谢芹1,2,3,*(), 林立1,2,3,5,*(), 刘忠范1,2,3,*()   

  1. 1 北京大学化学与分子工程学院, 北京大学纳米化学研究中心, 北京分子科学国家研究中心, 北京 100871
    2 北京大学前沿交叉学科研究院, 北京 100871
    3 北京石墨烯研究院, 北京 100095
    4 国家纳米科学中心, 北京 100190
    5 北京大学材料科学与工程学院, 北京 100871
    6 中国石油大学理学院, 北京 102249
  • 收稿日期:2023-06-26 录用日期:2023-07-24 发布日期:2023-08-07
  • 通讯作者: 裘晓辉,谢芹,林立,刘忠范 E-mail:xhqiu@nanoctr.cn;xieqin-cnc@pku.edu.cn;linli-cnc@pku.edu.cn;zfliu@pku.edu.cn
  • 基金资助:
    国家自然科学基金(T2188101);国家自然科学基金(61974139);国家自然科学基金(51432002);国家自然科学基金(51520105003);国家自然科学基金(12232016);北京市科学技术委员会(Z181100004818001);北京市科学技术委员会(Z191100000819005);北京市科学技术委员会(Z191100000819007);北京市科学技术委员会(Z201100008720005);国家重点基础研究发展规划项目(2016YFA0200101);国家重点基础研究发展规划项目(2016YFA0200103);国家重点基础研究发展规划项目(2019YFA0708203);北京分子科学国家研究中心(BNLMS-CXTD-202001)

Crack-Free Transfer of Graphene Wafers via Photoresist as Transfer Medium

Junhao Liao1,2,3,4, Yixuan Zhao1,3, Zhaoning Hu3,5, Saiyu Bu5, Qi Lu3,6, Mingpeng Shang1,2,3, Kaicheng Jia3, Xiaohui Qiu4,*(), Qin Xie1,2,3,*(), Li Lin1,2,3,5,*(), Zhongfan Liu1,2,3,*()   

  1. 1 Center for Nanochemistry, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
    2 Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China
    3 Beijing Graphene Institute (BGI), Beijing 100095, China
    4 National Center for Nanoscience and Technology, Beijing 100190, China
    5 School of Materials Science and Engineering, Peking University, Beijing 100871, China
    6 College of Science, China University of Petroleum, Beijing 102249, China
  • Received:2023-06-26 Accepted:2023-07-24 Published:2023-08-07
  • Contact: Xiaohui Qiu, Qin Xie, Li Lin, Zhongfan Liu E-mail:xhqiu@nanoctr.cn;xieqin-cnc@pku.edu.cn;linli-cnc@pku.edu.cn;zfliu@pku.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(T2188101);the National Natural Science Foundation of China(61974139);the National Natural Science Foundation of China(51432002);the National Natural Science Foundation of China(51520105003);the National Natural Science Foundation of China(12232016);Beijing Municipal Science & Technology Commission(Z181100004818001);Beijing Municipal Science & Technology Commission(Z191100000819005);Beijing Municipal Science & Technology Commission(Z191100000819007);Beijing Municipal Science & Technology Commission(Z201100008720005);National Basic Research Program of China(2016YFA0200101);National Basic Research Program of China(2016YFA0200103);National Basic Research Program of China(2019YFA0708203);Beijing National Laboratory for Molecular Sciences(BNLMS-CXTD-202001)

摘要:

为实现石墨烯在光通讯、光互联、太赫兹探测等电子和光电子领域的应用价值,需要在硅基衬底上得到大面积、均一且性能优异的石墨烯薄膜材料。而高品质石墨烯薄膜的制备衬底多为金属,因此制备的石墨烯薄膜不可避免地需要通过合适的转移方法,转移到目标应用衬底上。而转移过程通常会引入破损、褶皱和污染物,其原因之一是石墨烯转移和器件加工过程中表面反复涂覆和去除转移介质聚合物和光刻胶类聚合物。为避免反复涂覆与去除高分子聚合物,本文直接利用光刻胶作为转移介质,成功实现了石墨烯的洁净转移。同时,转移后石墨烯的电学性质得到明显改善,平均载流子迁移率可达6200 cm2·V−1·s−1。此方法可实现石墨烯等二维材料无损、洁净转移和高性能器件的构筑,将有助于推动二维材料在电子、光电子器件领域的应用。

关键词: 石墨烯转移, 光刻胶, 转移介质, 载流子迁移率

Abstract:

Graphene offers exceptional properties, such as ultra-high carrier mobility, near-ballistic transport characteristics, and ultra-high-frequency operational response, making it an ideal material for radio-frequency devices and high-speed optical communications. To realize its potential applications, high-quality graphene films must be integrated onto target substrates with reliability, uniformity, and scalability. Despite significant progress in the chemical vapor deposition of high-quality graphene on catalytic metal substrates, the transfer of such films onto application-targeted substrates remains necessary for large-scale technological use, but it faces challenges like contaminations and cracks. Graphene's flexibility and single-atom thickness make it vulnerable to damage and folding during the transfer process due to force disturbances and uneven force distribution. Traditional graphene transfer methods employ organic polymers as a medium and remove them using organic solvents after transferring graphene onto the desired substrates. However, this repetitive process generates organic waste and leaves unavoidable contamination due to the limited solubility of the polymer. Furthermore, selective interlacing of organic solvents during polymer removal can detach graphene from the substrate and cause cracks. In this study, we demonstrate a novel approach to address these issues. Instead of using organic polymers, we directly use the photoresist as the transfer medium to mechanically delaminate graphene from the metal growth substrate onto the targeted substrate. By doing so, we eliminate the need for repeated polymer coating on the graphene surface, enabling successful transfer without crack formation, wrinkles, or unintentional doping. The strong interaction between graphene and the photoresist, coupled with the weakened interaction between graphene and the growth substrate due to oxidation, ensures crack-free delamination. Moreover, the photoresist serves as a patterned mask plate for exposure, etching, and other subsequent device fabrication processes. As a result, the electrical properties of graphene are improved, achieving an average carrier mobility of 6200 cm2·V−1·s−1. This integrated approach not only enhances the device performance of two-dimensional materials but also paves the way for future applications of such materials in electronics and photonics. In conclusion, our method offers a promising solution for the successful transfer and device fabrication of graphene, enhancing its potential in the field of electronics and photonics.

Key words: Graphene transfer, Photoresist, Transfer medium, Carrier mobility