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Organic Field-Effect Transistor Based Ultrafast, Flexible, Physiological Temperature Sensors with Hexagonal Barium Titanate Nanocrystals in Amorphous Matrix as Sensing Material.
摘要： Organic field-effect transistors (OFETs) with hexagonal barium titanate nanocrystals in amorphous matrix (h-BTNC) as one of the bilayer dielectric system have been fabricated on a highly flexible 10 μm thick polyethylene terephthalate (PET) substrates. The device current and mobility remains same upto a bending radius of 4mm that make it suitable for wearable e-skin applications. h-BTNC films found to be highly temperature sensitive and the OFETs designed based on this material showed ultra-precession (~4.3 mK), low power (~ 1μW at 1.2 V operating voltage), ultrafast response (~24 ms) in sensing temperature over a range from 20 °C to 45 °C continuously. The sensors are highly stable around body temperature and work at various extreme conditions, such as under water, solutions of different pH as well as of various salt concentrations. These properties make this sensor very unique and highly suitable for various healthcare and other applications, where in a small variation of temperature around this temperature range is required to be measured at an ultra-fast speed.
关键词： low power OFETs,electronic skin,temperature sensors,organic field-effect transistors,flexible sensors,healthcare sensors
更新于2025-09-23 15:23:52
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Patterning Smectic Liquid Crystals for OFETs at Low Temperature
摘要： The preparation of regular microstructures with liquid crystalline materials for organic field effect transistors (OFETs) is an attractive but challenging issue. However, it is usually limited by the difficulty of forming large-area single crystals aligned in a desirable direction. Herein, several terthiophene (TTP) smectic liquid crystals such as 8-TTP-8 and 12-TTP-11OH are patterned into highly crystalline microstripes by a sandwich system through a dewetting method. Morphology and orientation of the microstripes strongly depend on preparation temperature. Microstripes prepared below crystalline temperature are uniform, well-ordered, and show high field effect transistor (FET) mobility. Meanwhile, π–π stacking direction of the TTP backbone is perpendicular to the microstripe and the molecules stack in layer structure, standing up on the SiO2/Si substrate, which would provide an effective pathway for p-type charge transport. However, higher preparation temperatures at liquid crystalline or isotropic liquid range induce many defects in the crystal formation process and cause incline of the unit cell, thus leading to a sharp decrease in FET mobility. A possible mechanism of molecular stacking at different temperature range is proposed. This strategy promised to provide a new opportunity for the high cost-efficiency fabrication of OFETs.
关键词： OFETs,smectic liquid crystals,terthiophene,alignment,patterning
更新于2025-09-23 15:23:52
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Solution-processed organic field-effect transistors with cross-linked poly(4-vinylphenol)/polyvinyl alcohol bilayer dielectrics
摘要： A single-layer gate dielectric cannot meet the requirements of large permittivity (k) and low surface polarity for fabricating low-operating-voltage, high-performance OFETs. Here, we have designed a bilayer gate dielectric consisting of a low-k cross-linked poly(4-vinylphenol) (CL-PVP) in contact with an active layer to provide a low polar surface and an underneath high-k polyvinyl alcohol (PVA) layer to ensure a high capacitance. The results show that the CL-PVP/PVA bilayer not only offers a smooth and uniform surface with low polarity and low surface energy as well as good solvent resistance for efficient carrier transport, but also possesses a relatively high capacitance and low leakage current for low threshold and operating voltages. We have utilized this bilayer dielectric to fabricate OFETs based on a conventional semiconducting polymer poly(3-hexylthiophene) (P3HT). High overall device performances have been achieved in the devices with a mobility of 0.1 cm2V-1s-1. The maximum density of trap states at the interface between the P3HT film and the CL-PVP/PVA bilayer is estimated to be 7.10×1012 cm-2 eV-1, further proving that this bilayer dielectric provides a high quality interface for P3HT. The CL-PVP/PVA bilayer is thus a promising candidate as a gate dielectric for fabricating high-performance organic or even organic-inorganic hybrid perovskite transistors by a solution processing technique.
关键词： P3HT OFETs,gate dielectrics,low-k CL-PVP/high-k PVA bilayer,dielectric and surface properties
更新于2025-09-19 17:15:36
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The electronic applications of stable diradicaloids: present and future
摘要： Organic molecules with unpaired electrons are intriguing for advanced applications in molecular electronics, spintronics and organic batteries, as well as other possible applications. Among them, diradicaloids have received growing attention due to the characteristic resonance structures between open-shell and closed-shell forms that lead to unique properties such as low energy bandgap and strong intermolecular spin–spin interaction. Therefore, in recent years, vast efforts have been devoted to investigate the synthesis, structure and fundamental properties of diradicaloids. However, the electronic applications of diradicaloids still remain in an early stage. Only a few diradicaloids have already found their place in electronic devices. In this perspective, we summarize the recent development of electronic applications of stable diradicaloids. The challenges and opportunities of stable diradicaloids for future electronic applications are also discussed.
关键词： spintronics,organic electronics,organic batteries,OFETs,NIR dyes,OPDs,diradicaloids,electronic applications
更新于2025-09-19 17:15:36
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Influences of Structural Modification of Naphthalenediimides with Benzothiazole on Organic Field-Effect Transistor and Non-Fullerene Perovskite Solar Cell Characteristics
摘要： Developing air-stable high-performance small organic molecule based n-type and ambipolar organic field-effect transistors (OFETs) are very important and highly desirable. In this investigation, we designed and synthesized two naphthalenediimide (NDI) derivatives (NDI-BTH1 and NDI-BTH2), and found that introduction of 2-(benzo[d]thiazol-2-yl) acetonitrile groups at NDI core position gave lowest unoccupied molecular orbital (LUMO, -4.326 eV) and displayed strong electron affinities, suggesting that NDI-BTH1 might be a promising electron transporting material (i.e. n-type semiconductor). Whereas, NDI-BTH2 bearing bis(benzo[d]thiazol-2-yl)methane at NDI core with LUMO of -4.243 eV was demonstrated to be ambipolar material. OFET based on NDI-BTH1 and NDI-BTH2 have been fabricated and the charge carrier mobility of NDI-BTH1 and NDI-BTH2 are 14.00 × 10-5 cm2/Vs (μe = electron mobility) and 8.64×10-4 cm2/Vs (μe = electron mobility) and 1.68×10-4 cm2/Vs (μh = hole mobility), respectively. Moreover, a difference in NDI-core substituent moieties significantly alters the UV-vis absorption and cyclic voltammeter properties. Thus, we further successfully employed NDI-BTH1 and NDI-BTH2 as an electron transport layer (ETL) materials in inverted perovskite solar cells (PSCs). The PSC performance exhibits that NDI-BTH2 as ETL material gave higher power conversion efficiency (PCE) as compared to NDI-BTH1 i.e. NDI-BTH2 produces 15.4%, while NDI-BTH1 gives 13.7%, respectively. The PSCs performance is comparable with the results obtained in OFET. We presume that improvement in solar cell efficiency of NDI-BTH2-based PSCs is due to the well-matched LUMO of NDI-BTH2 toward conduction band of perovskite layer, which in turn increase electron extraction and transportation.
关键词： OFETs,electron transport,inverted perovskite,naphthalenediimides,solar cells
更新于2025-09-12 10:27:22
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Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A review
摘要： Organic field effect transistors (OFETs) have been the focus of sensing application research over the last two decades. In comparison to their inorganic counterparts, OFETs have multiple advantages, such as low-cost manufacturing, large area coverage, flexibility and readily tunable electronic material properties. To date, various organic semiconductors (OSCs), both polymers and small molecules, have been extensively researched for the purpose of developing the active channel layers in OFETs, enhancing their sensitivity and selectivity. However, OFET devices still need to be optimized to demonstrate reliable performance at the device level and in sensing applications. This review begins with an introduction of the OFETs with an emphasis on their geometry, materials (OSCs), fabrication process, and data analysis. After this, multiple applications are discussed and the progress regarding sensing elements and precisions is highlighted. In the end, the challenges and possible future directions of OFET arrays in embedded sensing platforms are presented.
关键词： stability,bi-layer,selectivity,biosensor,sensitivity,composites,OFETs,gamma irradiation,VOCs
更新于2025-09-09 09:28:46
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H2S and NH3 Detection with Langmuir-Schaefer Monolayer Organic Field-Effect Transistors
摘要： In this work gas sensing properties of Langmuir-Schaefer monolayer organic field-effect transistors (LS OFETs) prepared from organosilicon derivative of [1]benzothieno[3,2-b][1]-benzothiophene (BTBT) have been investigated. The monolayer has been deposited using Langmuir-Schaefer method, which results in a uniform low-defect monolayer with excellent electrical performance, hole mobility up to 7 × 10?2 cm2 V?1 s?1, the threshold voltage around 0 V and on-off ratio of 104. Developed sensors demonstrate a long-term stability of a half-year storage under ambient conditions. Preliminary investigations demonstrated that the LS OFETs give instantaneous response on ammonia and hydrogen sulfide at low concentrations. The results reported open new perspectives for the OFET-based gas-sensing technology.
关键词： OFETs,monolayer,organic electronics,chemical sensing,Langmuir-Schaefer
更新于2025-09-04 15:30:14