Abstract
A novel compact realization of the XNOR/ XOR function is demonstrated with multimodal transistors (MMTs). The multimodal thin-film transistors (MMT’s) structure allows efficient use of layout area in an implementation optimized for unipolar thin-film transistor (TFT) technologies, which may serve as a multipurpose element for conventional and emerging large-area electronics. Microcrystalline silicon device fabrication is complemented by physical simulations.
Highlights
X NOR and XOR are convenient for executing the identity operation, parity checking [1], encryption [2], and display control [3] and computation, e.g., binary neural networks [4]
As circuit failure increases with complexity and impacts yield [6], designs should be compact, comprising few thin-film transistors (TFTs), with robust operation that withstands imprecise fabrication [10], [11]
Amorphous silicon (a-Si) top gate multimodal transistor (MMT) were simulated as a proof of concept using Silvaco Atlas TCAD v.5.24.1.R and default material parameters
Summary
X NOR and XOR are convenient for executing the identity operation, parity checking [1], encryption [2], and display control [3] and computation, e.g., binary neural networks [4]. As circuit failure increases with complexity and impacts yield [6], designs should be compact, comprising few thin-film transistors (TFTs), with robust operation that withstands imprecise fabrication [10], [11]. Using multiple control gates can enable logic at the device level [12], but requires ambipolar conduction, and is incompatible with lowcost, unipolar fabrication technologies. In TFT realizations, biasing devices deep into the OFF-state is problematic, due to either thin-film material ambipolarity or back-channel conduction, making elegant designs based on pass transistor logic [13] untenable. We show a TFT implementation of XNOR/XOR (Fig. 1) using multimodal transistors (MMTs) [16]. The device (Fig. 2) enables highly functional, compact circuits, due to the split control of charge injection and transport
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