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Compared to gating using conventional solid-state dielectrics, ionic liquid gating allows for two to three orders of magnitude larger accumulation of charge densities (>10^14/cm^2) due to the extremely large geometrical capacitance of the electric double layer formed at the interface between the liquid and the gated material. In this study, we fabricate ionic gated graphene field-effect devices on a flexible and transparent substrate, polyethylene terephthalate (PET). Specifically, graphene thermopiles are realized by connecting multiple thermocouples in series. Each thermocouple consists of two different materials – thin metal line and graphene strip – where the thermopower of graphene is controlled with ionic gating. Our work demonstrates the good compatibility of the ionic liquid gating with graphene devices facilitated on the PET substrate.
