Enhanced Functionality of Dual-Gate Organic Transistors Based on Semiconducting/Insulating Polyblend-Induced Asymmetric Charge Modulation Layers

Abstract

Dual-gate organic thin-film transistors (DG-OTFTs) with enhanced functionality, including large current enhancement behavior, highly efficient threshold voltage controllability, and self-contained dual-mode logic gate features, are reported. These DG-OTFTs are based on a semiconducting/insulating polyblend-based active layer with asymmetric top and bottom charge modulation layers (atb-CMLs). The atb-CMLs are automatically generated through the preparation of multilayer stacks of phase-separated semiconducting poly­(3-hexylthiophene) (P3HT):insulating poly­(methylmethacrylate) (PMMA) polyblend layer, poly­(vinylidene fluoride) (PVDF) layer, and cross-linked-poly­(4-vinylphenol) (cPVP) layer. They consist of a thin PMMA bottom layer and an uneven-shaped PMMA:PVDF miscible mixture-based top layer. The presence of the polarizable insulating PMMA, PVDF, and PMMA:PVDF mixture regions causes the bottom and top CMLs to experience electrical polarization, which induces the dipole field to achieve efficient charge modulation functions in DG-OTFTs. Owing to the presence of atb-CMLs, the DG-OTFTs exhibit unprecedented electrical characteristics, such as the easy depletion of the bottom channel by the top gate potential. However, the top channel can work properly only when given a bottom gate potential (either positive or negative). Given these unusual electrical features, the design of the fundamental dual-mode logic gates (e.g., AND and OR gates) can be achieved with just one DG transistor. This finding opens an interesting direction for the preparation of DG-OTFTs with diverse operating modes and increasing functionality, thereby widening the application potential of such transistors.

Photocatalytic Hydrogen Evolution Enabled by Oriented Phase Interactions between Monolayers of P3HT‐Wrapped MoS2 and Ferroelectric Lamellar Crystals

“…Normally, this low level of binding energy has only been found for the dissociation of inorganic excitons, and thus commonly lesser free charge carriers are available in organic semiconductors. The ɛ r of the P3HT film is commonly around 3.5, [51] which was used to calculate the corresponding E b value. The obtained E b value is about 0.61 eV, which is six times larger than that in the environment with the ɛ r = 21.…”

Ultraviolet Light-Activated Charge Modulation Heterojunction for Versatile Organic Thin Film Transistors

“…Many studies have demonstrated that OSCs can be applied to light-emitting diodes, thin film transistors (TFTs), solar cells, memories, and sensors. − Among various applications of OSCs, organic TFTs (OTFTs) can be widely used in many types of devices or systems. − OTFTs act as basic units, such as drive and switch devices in electronic circuits. The combinations of different OTFTs form various logic gates. − OTFTs can also work as nonvolatile memory devices. ,, Moreover, because of the feature of signal amplification, OTFTs can be appropriately used as sensing devices, such as photosensors, gas sensors, and biosensors. ,, Recently, the introduction of the internet of things leads to the increased requirement of smart wearable devices. Smart wearable devices usually contain various types of sensors, specifically photosensors for the use of image recognition, light control, and snapping.…”