Journal
NEW JOURNAL OF CHEMISTRY
Volume 43, Issue 38, Pages 15275-15279Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nj03537k
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Funding
- Danish National Research Foundation
- Karen Elise Jensens Fond
- Villum Foundation
- AUFF NOVA-project
- Fundamental Research Funds for the Central Universities [ZYGX2010J031, YJ201893]
- State Key Lab of Advanced Metals and Materials, China [2019-Z03]
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Molecular doping has been considered as one of the promising methods to modulate the electrical property of graphene due to its easy operation and no defect generation. However, its stability has not yet been studied. In this study, large area graphene films were synthesized by chemical vapor deposition. The graphene field effect transistors (GFETs) were fabricated by photolithography. The electrical transport measurement demonstrates that the Dirac point of GFETs shifts from +54 V to -22 V after doping the GFETs with a polyethylenimine (PEI) molecule. Further, the influence of the electrical annealing and exposure time to air were systemically studied. The results show that the PEI molecule could be removed under a large measurement current and the electron mobility decreased faster than that of hole mobility under electrical annealing. The study of the PEI doped GFETs exposed to air shows that the oxygen and water firstly interacts with the PEI molecule and then directly interacts with graphene.
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