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Fig. 3(Color online) Electrical properties of adsorbate-free graphene devices during replicating experiments. (a) Schematics of the testing processes to demonstrate the effect of heat treatment. The procedures of coating and erasing the polymers with acetone on the completed LM device and annealing the device are shown. The magenta circles on the channel surface represent adsorbates. (b, c) Transfer curves of the LM device with several steps are shown in (a), and each row includes the following processes: (i) After annealing the LM device at 200 °C for an hour under vacuum. (ii) After coating PR (b), or PMMA (c) with the same treatment as that in Fig. 1(a). (iii) After erasing PR (c), or PMMA (c) using acetone. (iv) After a second annealing under vacuum. All solid lines and dashed lines in the transfer curve represent a forward sweep and backward sweep of the gate bias, respectively.
New Phys.: Sae Mulli 2024;74:8~16