A facile process to achieve hysteresis-free and fully stabilized graphene field-effect transistors

作者：Kim Yun Ji; Lee Young Gon; Jung Ukjin; Lee Sangchul; Lee Sang Kyung; Lee Byoung Hun^*

来源：Nanoscale, 2015, 7(9): 4013-4019.

DOI：10.1039/c4nr06397j

The operation of chemical vapor-deposited (CVD) graphene field-effect transistors (GFETs) is highly sensitive to environmental factors such as the substrate, polymer residues, ambient condition, and other species adsorbed on the graphene surface due to their high defect density. As a result, CVD GFETs often exhibit a large hysteresis and time-dependent instability. These problems become a major roadblock in the systematic study of graphene devices. We report a facile process to alleviate these problems, which can be used to fabricate stable high performance CVD GFETs with symmetrical current-voltage (I-V) characteristics and an effective carrier mobility over 6000 cm(2) V-1 s(-1). This process combined a few steps of processes in sequence including pre-annealing in a vacuum, depositing a passivation layer, and the final annealing in a vacuum, and eliminated similar to 50% of charging sources primarily originating from water reduction reactions.

• 出版日期2015