Wavy Channel TFT-Based Digital Circuits

Amir Hanna, Aftab M. Hussain, Aftab M. Hussain, Aftab M. Hussain, Hesham Omran, Sarah M. Alsharif, Khaled N. Salama, Muhammad Mustafa Hussain

    Research output: Contribution to journalArticlepeer-review

    4 Scopus citations

    Abstract

    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.
    Original languageEnglish (US)
    Pages (from-to)1550-1556
    Number of pages7
    JournalIEEE Transactions on Electron Devices
    Volume63
    Issue number4
    DOIs
    StatePublished - Feb 23 2016

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