Monolithic Tandem Vertical Electrochemical Transistors for Printed Multi-valued Logic.

Organic electrochemical transistors (OECTs) have recently emerged as a feasible candidate to realize the next-generation printable electronics. Especially, their chemical versability and the unique redox-based operating principle have provided new possibilities in high-functioning logic circuitry beyond the traditional binary Boolean logic. Here, for the first time, we present a simple strategy to electrochemically realize monolithic multi-valued logic transistors, which is one of the most promising branches of transistor technology in the forthcoming era of hyper Moore's law. A vertically stacked heterogeneous dual-channel architecture was introduced with a patterned reference electrode, which enabled a facile manifestation of stable and equiprobable ternary logic states with a reduced transistor footprint. The dual ion penetration mechanism coupled with ultrashort vertical channel even allowed a very-high accessing frequency to multiple logic states reaching over 10 MHz. Furthermore, printed arrays of ternary logic gates with full voltage swing within 1 V is demonstrated. This article is protected by copyright. All rights reserved.