Teng Yunjie, Tong Shoufeng, Zhang Min
College of Opto-Electronic Engineering, Changchun University of Science and Technology, Changchun, 130012, People's Republic of China.
Institute of Space Photo-Electronic Technology, Changchun University of Science and Technology, Changchun, 130012, People's Republic of China.
Nanoscale Res Lett. 2018 Nov 6;13(1):352. doi: 10.1186/s11671-018-2767-z.
In this work, sharp wrinkles on graphene films, caused by graphene duplicating the grain boundary cracks of copper foil during the preparation process, were carefully explored. A secondary-transferring graphene film process was proposed to re-transform the "Peak" morphology of graphene surface into "Valley" form. The process we have developed is highly effective and almost nondestructive to the graphene through testing the surface morphology and photo-electric properties before and after the secondary-transferring process. Flexible organic light-emitting device (FOLED) with PEDOT:PSS/SLG/NOA63 framework as a targeted application was fabricated to illustrate the value of our proposed method in fabricating stable devices, the maximum luminance can reach about 35000 cd/m, and the maximum current efficiency was 16.19 cd/A. This method can also be applied to the roll-to-roll preparation of large area high-quality graphene.
在这项工作中，我们仔细研究了石墨烯薄膜上的尖锐褶皱，这些褶皱是在制备过程中石墨烯复制铜箔的晶界裂纹所导致的。我们提出了一种二次转移石墨烯薄膜的工艺，将石墨烯表面的“峰”形态重新转变为“谷”形态。通过测试二次转移工艺前后的表面形貌和光电性能，我们所开发的工艺非常有效，并且对石墨烯几乎没有破坏作用。我们制备了以PEDOT:PSS/SLG/NOA63为框架的柔性有机发光器件（FOLED）作为目标应用，以说明我们所提出的方法在制造稳定器件方面的价值，其最大亮度可达约35000 cd/m ，最大电流效率为16.19 cd/A。该方法还可应用于大面积高质量石墨烯的卷对卷制备。
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