期刊
ACS NANO
卷 6, 期 6, 页码 5360-5365出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn301207d
关键词
graphene; dry transfer; hot pressing; arbitrary substrate; chemical vapor deposition; multiscale analysis
类别
资金
- World Class University [R33-10079]
- Global Research Lab (GRL) [2011-0021972]
- Center for Advanced Soft Electronic [2011-0031627]
- National Research Foundation of Korea [2011K000615, 2011-0017587, 2009-0083540, 2009-0090017]
- Ministry of Education, Science and Technology
- Samsung Display Co., Ltd
- National Research Foundation of Korea [2009-0090017, 2011-0017587] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Graphene films grown on metal substrates by chemical vapor deposition (CVD) method have to be safely transferred onto desired substrates for further applications. Recently, a roll-to-roll (R2R) method has been developed for large-area transfer, which is particularly efficient for flexible target substrates. However, in the case of rigid substrates such as glass or wafers, the roll-based method is found to induce considerable mechanical damages on graphene films during the transfer process, resulting in the degradation of electrical property. Here we introduce an improved dry transfer technique based on a hot-pressing method that can minimize damage on graphene by neutralizing mechanical stress. Thus, we enhanced the transfer efficiency of the large-area graphene films on a substrate with arbitrary thickness and rigidity, evidenced by scanning electron microscope (SEM) and atomic force microscope (AFM) images, Raman spectra, and various electrical characterizations. We also performed a theoretical multiscale simulation from continuum to atomic level to compare the mechanical stresses caused by the R2R and the hot-pressing methods, which also supports our conclusion. Consequently, we believe that the proposed hot-pressing method will be immediately useful for display and solar cell applications that currently require rigid and large substrates.
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