ABSTRACT
Universal logic gates, NAND and NOR, are the backbone of integrated circuits for the reason that any Boolean expression and higher-level digital integrated circuits (latch, flip flop, decoder, multiplexer, arithmetic logic unit, etc.) can be realized with the network of either of these two gates. Brown et al. demonstrated two-input universal gates based on all-p pentacene OTFTs, operating at –15 V [8]. Similarly, Kim et al. in 2009 reported mechanically flexible NAND and NOR logic gates using a self-assembled monolayer of dielectric on the plastic substrate [9]. Recently, Guerin et al. in 2013 reported that organic NAND and NOR gates operated at 40 V using poly(triarylamine)-based p-type and acene-diimide-based n-type OTFTs [10]. The operating frequency of these logic gates was limited to 450 Hz due to 26% reduced mobility of n-type transistor in comparison to its p-type counterpart.
