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(a) Photograph of the flexible complementary inverter sheet. (b) Device structure. -type a-IGZO TFTs were vertically stacked on -type F8T2 TFTs. (c) Top-view photograph of a complementary inverter.
(a) Transfer characteristics of a -type F8T2 TFT (red line) and a -type a-IGZO TFT (blue line) in an inverter at . The dashed lines show plots. (b) and (c) show the output characteristics for the F8T2 TFT and the a-IGZO TFT, respectively.
(a) Circuit diagram of the complementary inverter. (b) VTC of the flexile hybrid complementary inverter. The input voltage was scanned from 30 to −10 V with supply voltages of 10–30 V. The red lines show the voltage gain characteristics. The , , , and are input and output voltages at high and low levels, respectively. and are determined by where .
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