Abstract
AbstractFlexible indium‐tin‐oxide (ITO)‐based homojunction thin‐film transistors (TFTs) are fabricated on cellulose‐nanofiber‐soaked paper substrates. The paper is simultaneously used as the gate dielectric and substrate. Source/drain electrodes and a channel layer are sputtered by one‐step radio‐frequency sputtering deposition. The paper exhibits a very large specific electric‐double‐layer capacitance of 2.3 µF cm−2 due to the existence of mobile protons. The flexible ITO‐based TFTs can operate at a low voltage of 2.0 V and show a relatively high ION/IOFF ratio of 7.5 × 106. Furthermore, no obvious electrical degradation is observed at various bending radii. Finally, inverter and NAND logic operation are demonstrated by the TFTs together with two in‐plane gates. Such flexible homojunction TFTs on low‐cost and biodegradable paper are promising for portable paper electronics.
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