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ACS Nano. 2019 May 28;13(5):5513-5522. doi: 10.1021/acsnano.9b00330. Epub 2019 Apr 30.

A Double Support Layer for Facile Clean Transfer of Two-Dimensional Materials for High-Performance Electronic and Optoelectronic Devices.

Zhang D1,2, Du J1,2, Hong YL1,2, Zhang W1,2, Wang X3,4, Jin H3, Burn PL3, Yu J4, Chen M1,2, Sun DM1,2, Li M5, Liu L5, Ma LP1,2, Cheng HM1,2,6, Ren W1,2.

Author information

1
Shenyang National Laboratory for Materials Science , Institute of Metal Research, Chinese Academy of Sciences , 72 Wenhua Road , Shenyang 110016 , P.R. China.
2
School of Materials Science and Engineering , University of Science and Technology of China , 72 Wenhua Road , Shenyang 110016 , P.R. China.
3
Centre for Organic Photonics & Electronics, School of Chemistry and Molecular Biosciences , The University of Queensland , Brisbane QLD 4072 , Australia.
4
State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering , University of Electronic Science and Technology of China (UESTC) , Chengdu 610054 , P.R. China.
5
Shenyang Institute of Automation , Chinese Academy of Sciences , 114 Nanta Street , Shenyang 110016 , P.R. China.
6
Shenzhen Geim Graphene Center, Tsinghua-Berkeley Shenzhen Institute , Tsinghua University , 1001 Xueyuan Road , Shenzhen 518055 , P.R. China.

Abstract

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 WSe2 and WS2 single crystals grown on Au as well as large-area graphene films grown on Cu. As a result of the clean surface, the transferred WSe2 retains 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.

KEYWORDS:

2D materials; clean transfer; graphene; optoelectronic devices; rosin

PMID:
31013418
DOI:
10.1021/acsnano.9b00330

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