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Typical transfer curve of the OTFTs with of cross-linked PVA insulator. The severe hysteresis effect is observed.
Transfer curves with the increasing sweep ranges. For each curve, the total sweep times are sustained equally by adjusting the number of voltage steps and time per each step. The hysteresis does not saturate as the sweep range is increased.
(Color online) Measured curves for two virgin devices for the opposite sweep direction. (a) When is swept from positive to negative value, the transfer curve passes under the reference point by the effect of the positive accumulated gate bias stress during measurement. (b) But the transfer curve passes over the reference point by the negative gate bias stress when the sweep direction is reversed.
Transfer curve of the OTFTs with a blocking oxide between gate and the cross-linked PVA insulator. For fair comparison with Fig. 1, the range and step are carefully determined in order to apply the same gate electric field to the PVA layer. The hysteresis effect is clearly reduced and the curve passes near the reference point.
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