Journal
IEEE ELECTRON DEVICE LETTERS
Volume 43, Issue 1, Pages 52-55Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2021.3131112
Keywords
Inverters; Thin film transistors; Logic gates; Iron; Threshold voltage; Ring oscillators; Passivation; Tin monoxide (SnO); ambipolar thin-film transistor; complementary-like inverter; analytical device analysis; ring oscillator
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In this study, the voltage transfer characteristics (VTC) of a CMOS-like inverter using ambipolar SnO-thin-film transistor were analyzed, and the key factors influencing VTC were identified. The results showed that VTC could be improved by reducing the subgap defect states in the channel.
The voltage transfer characteristics (VTC) of complementary metal-oxide-semiconductor (CMOS)-like inverter using ambipolar SnO-thin-film transistor were analyzed based on analytical simulation to extract ambipolar parameters such as majority/minority carrier mobility. The unbalanced majority carrier mobilities caused by the inferior electron mobility limited the inverter characteristics, and the minority carrier conduction resulted in non-full swing Z-shape VTC in the oxide-CMOS-like inverter. We found that a majority/minority carrier mobility ratio was a key parameter to improve the VTC by reducing the subgap defect states in SnO channel. We also fabricated 3-stage ring oscillator using the CMOS-like inverters and confirmed the ambipolar operation with positive/negative supply voltages.
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