Printed 5-V organic operational amplifiers for various signal processing

Matsui, Hiroyuki; Hayasaka, Kazuma; Takeda, Yasunori; Shiwaku, Rei; Kwon, Jung‐Dae; Tokito, Shizuo

doi:10.1038/s41598-018-27205-7

Cited by 29 publications

(20 citation statements)

References 28 publications

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“…Device simulation in finite element method (FEM) was carried out to investigate the carrier distribution in single-and dual-gate p-type transistors by using the mathematics module of COMSOL Multiphysics (KESCO Ltd., Tokyo, Japan) [14]. The simulation was based on the Poisson equation and the continuity equation.…”

Section: Methods Of the Device Simulationmentioning

confidence: 99%

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Charge Carrier Distribution in Low-Voltage Dual-Gate Organic Thin-Film Transistors

et al. 2018

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Dual-gate organic thin-film transistors (DGOTFTs), which exhibit better electrical properties, in terms of on-current and subthreshold slope than those of single-gate organic thin-film transistors (OTFTs) are promising devices for high-performance and robust organic electronics. Electrical behaviors of high-voltage (>10 V) DGOTFTs have been studied: however, the performance analysis in low-voltage DGOTFTs has not been reported because fabrication of low-voltage DGOTFTs is generally challenging. In this study, we successfully fabricated low-voltage (<5 V) DGOTFTs by employing thin parylene film as gate dielectrics and visualized the charge carrier distributions in low-voltage DGOTFTs by a simulation that is based on finite element method (FEM). The simulation results indicated that the dual-gate system produces a dual-channel and has excellent control of charge carrier density in the organic semiconducting layer, which leads to the better switching characteristics than the single-gate devices.

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Section: Methods Of the Device Simulationmentioning

confidence: 99%

“…This DG architecture also enables control of threshold voltage (V TH ) of the OTFTs [7]. These features are significant for realizing high-performance and robust organic electronics [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Charge Carrier Distribution in Low-Voltage Dual-Gate Organic Thin-Film Transistors

et al. 2018

Self Cite

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“…While most printing techniques can provide faster fabrication processes, the rapid on‐demand modulation of W / L scale ratio in large array of devices remains as a challenge and a topic to investigate; especially for the myriad of specified circuit designs and application requirements. For instance, the tuning of the gain in each stage of an amplifier or logic circuits requires the modulation of OTFT W / L ratio. These configuration changes can be challenging, costly, and time consuming for common electrode printing techniques, such as screen printing and gravure printing .…”

Section: Introductionmentioning

confidence: 99%

“…

film transistor show device performance reaching that of amorphous Si and solution-processed metal oxides. For instance, the tuning of the gain in each stage of an amplifier [16][17][18] or logic circuits [5] requires the modulation of OTFT W/L ratio. [13][14][15] Modulation of scale ratio of devices in a large array is one of the important parameters that governs circuit design.

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mentioning

confidence: 99%

Printed Flexible Organic Transistors with Tunable Aspect Ratios

Sadeghi

Delparastan

Pierre

et al. 2019

Adv Elect Materials

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film transistor show device performance reaching that of amorphous Si and solution-processed metal oxides. This high performance makes SOCs p-type OTFTs a strong candidate for several future complementary metal-oxide semiconductor applications. [13][14][15] Modulation of scale ratio of devices in a large array is one of the important parameters that governs circuit design. While most printing techniques can provide faster fabrication processes, the rapid on-demand modulation of W/L scale ratio in large array of devices remains as a challenge and a topic to investigate; especially for the myriad of specified circuit designs and application requirements. For instance, the tuning of the gain in each stage of an amplifier [16][17][18] or logic circuits [5] requires the modulation of OTFT W/L ratio. These configuration changes can be challenging, costly, and time consuming for common electrode printing techniques, such as screen printing and gravure printing. [19][20][21][22] These conventional mask-based approaches utilize a fixed pattern transfer that requires a full re-design for every new device structure. [21,23,24] Inkjet printing on the other hand is a nonimpact digital prototyping method that provides instant change of patterns. [25,26] This elimination of mask can reduce the processing costs especially for larger-scale production. [27] However, throughput of inkjet printing can become a limiting factor, especially when depositing over large area. [28] Interdigitated source and drain structure have been used in previous reports as a method to modify W/L ratio for a specific circuit design. [17,[29][30][31] The channel width (W) is modulated by changing the finger count. Meanwhile, channel length (L) is the smallest space between source and drain electrodes, and the resolution is associated to the printing technique. Low switching speed is one of the drawbacks of printed OTFTs compared to conventional Si technology, which can result from a number of factors such as mobility, dielectric layer thickness, and channel length. Achieving channel lengths smaller than 10 µm while maintaining high device yield is very challenging with printing techniques, especially for low-viscosity inks. The solution found to overcome this challenge is to utilize a combination of patterning techniques including the combination of conventional photolithography and direct-write printing techniques. [32] In parallel, there has been an interest to develop methods to decrease the source and drain electrode geometry and channel length using many printing methods. Interdigitated source and drain (SD) electrodes are typically used in electronics to increase channel width while maintaining small channel lengths, resulting in higher W/L ratios. There are few reports on printed interdigitated A fabrication technique that allows aspect ratio modulation in a large array of organic thin film transistors (OTFTs) is demonstrated. In this design, discrete interdigitated source and drain electrodes can be individually selected to create a range of aspe...

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“…A transimpedance amplifier is often defined as a current-tovoltage (I -V) converter. In recent research, differential or transimpedance amplifiers have been fabricated with solutionbased methods on flexible substrates, with working voltage in the range from -5V to 5V, with voltage gain in the range from 1 to 50 [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Roll-to-Roll processable OTFT-based Amplifier and Application for pH sensing

Zhang

Chen

Anastasova

et al. 2019

2019 IEEE 16th International Conference on Wearable and Implantable Body Sensor Networks (BSN)

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The prospect of roll-to-roll (R2R) processable Organic Thin Film Transistors (OTFTs) and circuits has attracted attention due to their mechanical flexibility and low cost of manufacture. This work will present a flexible electronics application for pH sensing with flexible and wearable signal processing circuits. A transimpedance amplifier was designed and fabricated on a polyethylene naphthalate (PEN) substrate prototype sheet that consists of 54 transistors. Different types and current ratios of current mirrors were initially created and then a suitable simple 1:3 current mirror (200nA) was selected to present the best performance of the proposed OTFT based transimpedance amplifier (TIA). Finally, this transimpedance amplifier was connected to a customized needle-based pH sensor that was induced as microfluidic collector for potential disease diagnosis and healthcare monitoring.

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Printed 5-V organic operational amplifiers for various signal processing

Cited by 29 publications

References 28 publications

Charge Carrier Distribution in Low-Voltage Dual-Gate Organic Thin-Film Transistors

Charge Carrier Distribution in Low-Voltage Dual-Gate Organic Thin-Film Transistors

Printed Flexible Organic Transistors with Tunable Aspect Ratios

Roll-to-Roll processable OTFT-based Amplifier and Application for pH sensing

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