A Double Support Layer for Facile Clean Transfer of Two-Dimensional Materials for High-Performance Electronic and Optoelectronic Devices
A Double Support Layer for Facile Clean Transfer of Two-Dimensional Materials for High-Performance Electronic and Optoelectronic Devices
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用于高性能电子和光电器件的二维材料的轻松清洁转移的双支撑层
DOI：
10.1021/acsnano.9b00330
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发表时间：
2019
期刊：
影响因子：
17.1
通讯作者：
Ren Wencai
中科院分区：
文献类型：
--
作者：
Zhang Dingdong;Du Jinhong;Hong Yi-Lun;Zhang Weimin;Wang Xiao;Jin Hui;Burn Paul L.;Yu Junsheng;Chen Maolin;Sun Dong-Min;Li Meng;Liu Lianqing;Ma Lai-Peng;Cheng Hui-Ming;Ren Wencai
化学气相沉积生长的二维(2D)材料的清洁转移是其在电子学和光电子学中应用的关键。虽然松香可以作为铜上生长的石墨烯清洁转移的支撑层，但它不能用于贵金属上生长的2D材料的转移或大面积转移。在这里，我们报告了一种聚甲基丙烯酸甲酯(PMMA)/松香双支撑层，它能够方便地将生长在不同金属上的大面积2D材料进行超清洁转移。底部的松香层确保了清洁的转移，而上层的PMMA不仅屏蔽了松香的转移条件，还提高了转移层的强度，使转移更容易和更坚固。我们研究了在Au上生长的单层WSe2和WS2单晶以及在Cu上生长的大面积石墨烯薄膜的转移。由于表面清洁，转移的WSe2保留了生长样品的固有光学性质。此外，它不需要退火即可与金属电极形成良好的欧姆接触，使高性能场效应管的迁移率和通断比∼比PMMA转移WSe2高10倍。超纯石墨烯薄膜是柔性有机光伏电池的良好阳极，其功率转换效率可达∼6.4%。
Clean transfer of two-dimensional (2D) materials grown by chemical vapor deposition is critical for their application in electronics and optoelectronics. Although rosin can be used as a support layer for the clean transfer of graphene grown on Cu, it has not been usable for the transfer of 2D materials grown on noble metals or for large-area transfer. Here, we report a poly(methyl methacrylate) (PMMA)/rosin double support layer that enables facile ultraclean transfer of large-area 2D materials grown on different metals. The bottom rosin layer ensures clean transfer, whereas the top PMMA layer not only screens the rosin from the transfer conditions but also improves the strength of the transfer layer to make the transfer easier and more robust. We demonstrate the transfer of monolayer WSe2and WS2single crystals grown on Au as well as large-area graphene films grown on Cu. As a result of the clean surface, the transferred WSe2retains the intrinsic optical properties of the as-grown sample. Moreover, it does not require annealing to form good ohmic contacts with metal electrodes, enabling high-performance field effect transistors with mobility and ON/OFF ratio ∼10 times higher than those made by PMMA-transferred WSe2. The ultraclean graphene film is found to be a good anode for flexible organic photovoltaic cells with a high power conversion efficiency of ∼6.4% achieved.