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Pyrene-SH functionalized OTFT for detection of Hg2+ ions in aquatic environments
摘要： Mercury ion (Hg2+) sensor based on bottom gate top contact organic thin film transistor (OTFT) was fabricated. The OTFT channel area was functionalized with pyrene that contain thiol group, which has strong binding affinity toward Hg2+ ion. The OTFT sensor exhibited a charge mobility of 0.28 cm2 V–1 s–1, a threshold voltage of -22.3 V and on-to-off ratio 103. The sensor shows high selectivity to Hg2+ ion over other two valence metal ions. OTFT sensor exhibited high sensitivity to Hg2+ ion, indicated by increasing of drain current after exposed to different concentration of Hg2+ ion ranging from 1 mM to 0.01 μM. Moreover, the OTFT sensor capability for practical application was also demonstrated by sensing the present of 25 μM of Hg2+ ion in tap, drinking and seawater samples.
关键词： Mercury sensor,Pyrene derivative,Organic thin film transistor
更新于2025-11-14 17:28:48
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Hybrid bilayer gate dielectric-based organic thin film transistors
摘要： Organic thin film transistors (OTFTs) are key building blocks for flexible, low cost electronics systems. They provide a viable alternative for silicon-based electronics with added advantages of low cost and flexibility. However, few issues like high-operating voltage, low-switching speed, high-leakage current and reliability are still a challenge. The overall performance of an OTFT depends on organic semiconductors and gate dielectric interface. In this paper, we review the current status and trends in the choice of dielectric layer for OTFTs. As a starting point, the performance parameters of an OTFT and their dependence on the dielectric layer are briefly discussed. A variety of dielectric materials which includes high-k inorganic, organic, surface coated inorganics and nanocomposites are also presented. The advantages and drawbacks of each of these materials are discussed in detail. We reviewed the latest developments in the dielectric materials especially, self-assembled monolayers (SAMs), hybrid bilayers and nanocomposites. SAM-based OTFTs offer several advantages but shift in the threshold voltage remains a concern. Nanocomposites are a latest addition to the dielectric materials, which offer advantages like solution processing and improved dielectric constant but have a rough surface. A hybrid bilayer that incorporates the inorganic dielectric as a base layer and a thin polymer layer over it to improve the surface properties offers several desirable characteristics over the other choices. Hence, we propose that hybrid bilayer gate dielectrics shall play a pivotal role in improving the OTFT performance.
关键词： low-k organic,high-k inorganic,Organic thin film transistor,self-assembled monolayer,gate dielectric,hybrid bilayer
更新于2025-09-23 15:23:52
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Critical impact of gate dielectric interfaces on the trap states and cumulative charge of high-performance organic thin field transistors
摘要： In the operation of OFETs, the electrical properties are strongly dependent on the merits of the constituting layers and the formed interfaces. Here we study the trap states variations at the interface between the organic semiconductor pentacene and polymer insulators. With ZrO2 dielectric modified by polymers and find a 10 × decrease in the density of trap states at the semiconductor/insulator interface, bring about the charge carrier mobility increase from 0.058 cm2/Vs to 0.335 cm2/Vs. In addition, when compare to the thicker films at the same applied gate voltage, the thinner film would lead to enhanced coupling capability and more charges cumulative cumulated at the channel region, which is pivotal for optimizing the performance of OFETs. The results prove that the property of the insulator layer could impact largely on the device performance.
关键词： Organic thin film transistor,Cumulative charge,Insulator/semiconductor interface,Trap states
更新于2025-09-23 15:23:52
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Transport models in disordered organic semiconductors and their application to the simulation of thin-film transistors
摘要： Relevant organic thin-film transistor (OTFT) simulation software must account for the main specificities of organic semiconductors (OSC) in term of free carriers’ density of states, transport mechanisms, and injection/collection properties from/to the device contacts. Among the parameters impacting the OTFT performance the carrier mobility is a key parameter. Usual methods to extract the mobility from current-voltage (I-V) measurements lead to obtained only an apparent, or effective, mobility. The value of the apparent mobility is different of the intrinsic channel organic semiconductor mobility. Despite this effective mobility actually determines most of a given device performance, therefore providing a very useful technology benchmark, it does not describe the intrinsic organic semiconductor material transport properties, and may even be misleading in the route to improve the OTFT fabrication process. To obtain a better understanding of the transport properties in OSCs using OTFT electrical characterization, implementing an appropriate physical mobility model in an OTFT I-V simulation software is a good way. The present paper gives a review of the carrier mobility models which can be implemented in OTFT simulation software. The review is restricted to the analytical and semi-analytical physical models taking into account the temperature, the carrier concentration and the electric field dependence of the carrier mobility in disordered OSCs.
关键词： mobility,transport,modeling,organic semiconductors,Organic thin-film transistor (OTFT)
更新于2025-09-23 15:22:29
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[IEEE 2018 International Flexible Electronics Technology Conference (IFETC) - Ottawa, ON, Canada (2018.8.7-2018.8.9)] 2018 International Flexible Electronics Technology Conference (IFETC) - Flexible Printed Organic Thin-Film Transistor Devices and Integrated Circuit Applications
摘要： The latest developments in flexible and printed electronics technology based on organic thin-film transistor (OTFT) devices as well as printable electronic materials are briefly reported on in this paper. The successful fabrication and operation of printed OTFT devices and a variety of integrated circuit applications such as flip-flop logic gates and operational amplifiers will be demonstrated.
关键词： Organic electronics,Flexible electronics,Organic thin-film transistor,Printed electronics
更新于2025-09-23 15:22:29
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Biodegradable Materials for Organic Field-effect Transistors on a Paper Substrate
摘要： Paper-based pentacene organic thin-film transistors (OTFTs) with spin-coated gelatin (G) stacked gate dielectric layers, the Au/pentacene/G/G matrix-embedded iron (FeG)/Al/paper structure, were fabricated. The proposed composite-stacked bio-dielectric layer can be implemented using solutions with the degradable biomaterials. These materials enable a large-area printing of use-and-throw devices. Control devices (Au/pentacene/G/Al and Au/pentacene/FeG/Al structure) were also fabricated for comparison. High performance paper-based OTFT constructed from the stacked gate dielectric layer exhibited a carrier mobility of 8 cm2/Vs, on/off current ratio of approximately 103, subthreshold swing of 0.6 V/dec, and threshold voltage of ?1.4 V. These results are compatible to those OTFTs fabricated on other substrates. Therefore, the emerging biomaterial-based transistors on paper substrates may help in developing low-cost, environment-friendly devices.
关键词： paper,pentacene,gelatin,organic thin-film transistor (OTFT),solution process
更新于2025-09-19 17:15:36
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Organic LED based light sensor for detection of ovarian cancer
摘要： Organic devices possess an interdisciplinary facet that can be utilized in the different fields; communication, memory devices, bio-degradable technology and sensor application owing to their robustness, light weight and low power requirements. The proposed work is focused on the development of a sensor application based on the organic LEDs for the diagnosis of ‘Ovarian Cancer’. Two organic LEDs: Multilayered OLED and triple hole block layer OLED are analyzed for utilization as light detector and light source in the sensing device for cancer detection. Multilayered OLED depicts excellent light detection qualities owing to lower electron hole recombination and it is six times better as compared to the triple hole block layer OLED. Therefore, it is used as the detector element in the sensing device. On the other hand, triple hole block layer OLED, is used as light source due to its high luminescence characteristics of 25,285 cd/m2. Further, a dual gate OTFT is used to drive the triple hole block layer OLED, which is utilized as the light source. DG OTFT in dual gate mode is 18% better compared to single gate mode. Thus DG-OTFT in dual gate mode is able to generate 18 volts at the terminals of the triple HBL OLED necessary for its operation. Thereafter, light detection is performed utilizing the OLED. Multilayered OLED depicted excellent light detecting capabilities. It is able to generate a cathode current of 29mA and 13mA at an incident wavelength of 420 and 440 nm, respectively, an essential requirement for present sensor application. Therefore, it presents a possibility to fabricate a portable fully flexible device for the screening and diagnosis of the ovarian cancer.
关键词： Ovarian Cancer,Triple Hole Block Layer (THBL) OLED,Dual Gate-Organic Thin Film Transistor (DG-OTFT),Bio-Medical Sensor,Organic Light Emitting Diode (OLED)
更新于2025-09-11 14:15:04
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Actuator-Control Circuit Based on OTFTs and Flow-Rate Estimation for an All-Organic Fluid Pump
摘要： In this paper, we report the design of an organic thin-film transistor (OTFT) driver circuit for the actuator of an organic fluid pump, which can be integrated in a portable-size fully-organic artificial lung. Compared to traditional pump designs, lightness, compactness and scalability are achieved by adopting a creative pumping mechanism with a completely organic-material-based system concept. The transportable fluid volume is verified to be flexibly adjustable, enabling on-demand controllability and scalability of the pump’s fluid-flow rate. The simulations, based on an accurate surface-potential OTFT compact model, demonstrate that the necessary driving waveforms can be efficiently generated and adjusted to the actuator requirements. At the actuator-driving-circuit frequency of 0.98 Hz, an all-organic fluid pump with 40 cm length and 0.2 cm height is able to achieve a flow rate of 0.847 L/min, which satisfies the requirements for artificial-lung assist systems to a weakened normal lung.
关键词： organic thin-film transistor,fluid volume,organic actuator,organic circuit,HiSIM-organic model,artificial lung,circuit simulation
更新于2025-09-09 09:28:46
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Synthesis and characterization of photo-crosslinkable coumarin-containing polymer dielectric for organic transistors
摘要： Herein, a photo-crosslinkable coumarin-containing polymer, poly(7-(4-vinyl-benzyloxyl)-4-methylcoumarin) or PVBMC, was prepared, and its physicochemical and electrical properties as a gate dielectric in organic electronic devices, such as organic thin-film transistor (OTFT) and inverter, was evaluated. The crosslinking of PVBMC by exposure to UV light (365 nm) over time was characterized using Fourier-transform IR and UV-visible spectroscopy. The measured capacitance of the cross-linked PVBMC thin film in a metal-insulator-metal-type capacitor was as high as 36.4 pF/mm2. Pentacene-based OTFT and load-type inverter with the cross-linked PVBMC gate dielectric were prepared, and their electrical responses were evaluated under ambient conditions. The OTFT showed dominant hole charge carrier transport behavior with a field-effect mobility of 1.52 · 10-1 cm2/Vs and negligible hysteresis. The load-type inverter based on the OTFT exhibited moderate static and dynamic switching responses to the applied electrical pulse. These results suggest the potential application of photo-crosslinked PVBMC as a gate dielectric in the fabrication of high-performance OTFT-based devices.
关键词： Gate dielectric,Polymer film,Organic thin-film transistor,Photo-crosslinking
更新于2025-09-04 15:30:14
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Enhancement of the Electrical Performance of the Organic Ferroelectric Memory Transistor by Reducing the Surface Roughness of the Polymer Insulator with a Homo-Bilayer PVDF-TrFE
摘要： We suggest a feasible method to enhance the electrical performance of the organic nonvolatile memory transistor by reducing the surface roughness of the ferroelectric polymer insulator. A homo-bilayer of poly(vinylidene?uoride-co-tri?uoroethylene) [P(VDF-TrFE)] was used to control the high surface roughness of the conventional single layer [P(VDF-TrFE)] polymer insulator. The smoothening of the polymer insulator was achieved as the Z rms roughness was as low as 11.9 nm compared to the aboriginal single P(VDF-TrFE) ?lm of 18.8 nm. The homo-bilayer P(VDF-TrFE) thin ?lm transistor showed a higher memory on-off ratio (about 100) and mobility (2.9 × 10?2 cm2v?1s?1) compared with the native P(VDF-TrFE) with memory on-off ratio of 16 and mobility of 2.1 × 10?2 cm2v?1s?1. The underlying mechanism for the mobility enhancement which resulted in a high on-off ratio is mainly attributed to the reduction of the surface roughness of the ferroelectric polymer insulator.
关键词： Organic Thin Film Transistor,Ferroelectric,Homobilayer,P(VDF-TrFE)
更新于2025-09-04 15:30:14