Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China.
State Key Laboratory of Polymers Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China.
Nat Commun. 2017 Feb 24;8:14560. doi: 10.1038/ncomms14560.
The large polymer particle residue generated during the transfer process of graphene grown by chemical vapour deposition is a critical issue that limits its use in large-area thin-film devices such as organic light-emitting diodes. The available lighting areas of the graphene-based organic light-emitting diodes reported so far are usually <1 cm. Here we report a transfer method using rosin as a support layer, whose weak interaction with graphene, good solubility and sufficient strength enable ultraclean and damage-free transfer. The transferred graphene has a low surface roughness with an occasional maximum residue height of about 15 nm and a uniform sheet resistance of 560 Ω per square with about 1% deviation over a large area. Such clean, damage-free graphene has produced the four-inch monolithic flexible graphene-based organic light-emitting diode with a high brightness of about 10,000 cd m that can already satisfy the requirements for lighting sources and displays.
在化学气相沉积生长的石墨烯转移过程中产生的大聚合物颗粒残留是一个关键问题，限制了其在大面积薄膜器件（如有机发光二极管）中的应用。迄今为止，报道的基于石墨烯的有机发光二极管的可用照明区域通常<1cm。在这里，我们报告了一种使用松香作为支撑层的转移方法，其与石墨烯的弱相互作用、良好的溶解性和足够的强度使其能够实现超洁净和无损的转移。转移的石墨烯具有低表面粗糙度，偶尔最大残留高度约为 15nm，均匀的方阻为 560Ω，在大面积上的偏差约为 1%。如此干净、无损的石墨烯已经制造出了四英寸的单片式柔性石墨烯基有机发光二极管，其亮度约为 10000cd/m，已经可以满足光源和显示器的要求。
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