Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 4, Pages 2439-2443Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am5071464
Keywords
graphene; defect formation; field effect transistors; carrier doping; photochemical reactions; Raman spectroscopy
Funding
- New Energy and Industrial Technology Development Organization (NEDO)
- Grants-in-Aid for Scientific Research [25107002] Funding Source: KAKEN
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Graphene is a promising material for next-generation electronic devices. The effect of UV-irradiation on the graphene devices, however, has not been fully explored yet. Here we investigate the UV-induced change of the field effect transistor (FET) characteristics of graphene/SiO2. UV-irradiation in a vacuum gives rise to the decrease in carrier mobility and a hysteresis in the transfer characteristics. Annealing at 160 degrees C in a vacuum eliminates the hysteresis, recovers the mobility partially, and moves the charge neutrality point to the negative direction. Corresponding Raman spectra indicated that UV-irradiation induced D band relating with defects and the annealing at 160 degrees C in a vacuum removed the D band. We propose a phenomenological model for the UV-irradiated graphene, in which photochemical reaction produces dangling bonds and the weak sp(3)-like bonds at the graphene/SiO2 interface, and the annealing restores the intrinsic graphene/SiO2 interface by removal of such bonds. Our results shed light to the nature of defect formation by UV-light, which is important for the practical performance of graphene based electronics.
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