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Constant current measurement of TFTs with gate dielectric. Observe that a constant current yields a constant gate voltage because of zero threshold voltage shift in the TFT.
Constant current measurement of TFTs with gate dielectric. Unlike in Fig. 1, a constant current does not yield a constant gate voltage because of threshold voltage shift in the TFT, whose rates and saturation values are gate voltage dependent.
Timing diagram (not drawn to scale) showing the voltage pulses used to decouple the effect of TFT instability on the transfer characteristics.
Transfer characteristics of TFTs measured using the conventional (constant voltage) method and the alternative constant current measurement technique.
Transconductance curves showing a discrepancy close to a factor of 7 in peak values with the conventional and alternative extraction techniques.
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