Wavy Channel TFT-Based Digital Circuits

We report a wavy channel (WC) architecture thin-film transistor-based digital circuitry using ZnO as a channel material. The novel architecture allows for extending device width by integrating vertical finlike substrate corrugations giving rise to 50% larger device width, without occupying extra chip area. The enhancement in the output drive current is 100%, when compared with conventional planar architecture for devices occupying the same chip area. The current increase is attributed to both the extra device width and 50% enhancement in field-effect mobility due to electrostatic gating effects. Fabricated inverters show that WC inverters can achieve two times the peak-to-peak output voltage for the same input when compared with planar devices. In addition, WC inverters show 30% faster rise and fall times, and can operate up to around two times frequency of the planar inverters for the same peak-to-peak output voltage. WC NOR circuits have shown 70% higher peak-to-peak output voltage, over their planar counterparts, and WC pass transistor logic multiplexer circuit has shown more than five times faster high-to-low propagation delay compared with its planar counterpart at a similar peak-to-peak output voltage.

Hanna AN, Hussain A, Omran H, Alsharif SM, Salama KN, et al. (2016) Wavy Channel TFT-Based Digital Circuits. IEEE Transactions on Electron Devices 63: 1550–1556. Available: http://dx.doi.org/10.1109/TED.2016.2527795.

This work was supported by the King Abdullah University of Science and Technology within the Office of Sponsored Research under Grant CRG-1-2012-HUS-008. The review of this paper was arranged by Editor R. M. Todi.

Institute of Electrical and Electronics Engineers (IEEE)

IEEE Transactions on Electron Devices


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