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  • Title: Low-voltage self-assembled indium tin oxide thin-film transistors gated by microporous SiO2 treated by H3PO4.
    Author: Dou W, Tan Y.
    Journal: RSC Adv; 2019 Sep 26; 9(53):30715-30719. PubMed ID: 35529372.
    Abstract:
    Ultralow-voltage (0.8 V) thin-film transistors (TFTs) using self-assembled indium-tin-oxide (ITO) as the semiconducting layer and microporous SiO2 immersed in 5% H3PO4 for 30 minutes with huge electric-double-layer (EDL) capacitance as the gate dielectric are fabricated at room temperature. The huge EDL specific capacitance is 8.2 μF cm-2 at 20 Hz, and about 0.7 μF cm-2 even at 1 MHz. Both enhancement mode (V th = 0.15 V) and depletion mode (V th = -0.26 V) operation are realized by controlling the thickness of the self-assembled ITO semiconducting layer. Electrical characteristics with the equivalent field-effect mobility of 65.4 cm2 V-1 s-1, current on/off ratio of 2 × 106, and subthreshold swing of 80 mV per decade are demonstrated, which are promising for fast-switching and low-power electronics on temperature-sensitive substrates.
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