Current Status and Opportunities of Organic Thin-Film Transistor Technologies

Guo, Xiaojun; Xu, Yong; Ogier, Simon; Ng, Tse Nga; Caironi, Mario; Perinot, Andrea; Li, Ling; Zhao, Jian; Tang, Wei; Sporea, Radu A.; Nejim, A.; Carrabina, Jordi; Cain, Paul; Yan, Feng

doi:10.1109/ted.2017.2677086

Cited by 235 publications

(172 citation statements)

References 169 publications

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“…Conjugated polymers are promising electrically active components in flexible large‐area electronic devices that can be fabricated in a low‐cost and high‐throughput fasion . The joint efforts of physicists, engineers, and chemists have led to remarkable improvements in the performance of these devices.…”

Section: Introductionmentioning

confidence: 99%

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

Loo

2019

J Polym Sci B Polym Phys

102

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Conjugated polymers are promising candidates for next‐generation low‐cost flexible electronics. Field‐effect transistors comprising conjugated polymers have witnessed significant improvements in device performance, notably the field‐effect mobility, in the last three decades. However, to truly make these materials commercially competitive, a better understanding of charge‐transport mechanisms in these structurally heterogeneous systems is needed for providing systematic guides for further improvements. This review assesses the key microstructural features of conjugated polymers across multiple length scales that can influence charge transport, with special attention given to the underlying polymer physics. The mechanistic understanding from collective experimental and theoretical studies point to the importance of interconnected ordered domains given the macromolecular nature of the polymeric semiconductors. Based on the criterion, optimization to improve charge transport can be broadly characterized by efforts to (a) promote intrachain transport, (b) establish intercrystallite connectivity, and (c) enhance interchain coupling. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1559–1571

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Section: Introductionmentioning

confidence: 99%

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

Loo

2019

J Polym Sci B Polym Phys

102

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“…[1][2][3][4][5] Such vision has begun to show concrete potential through a variety of proofof-concept demonstrations, among which are programmable logic circuitry for flexible displays, [6] transferrable electronics for pharmaceutics, [7] healthcare sensors for brainwave detection [8] or pulse oximetry, [9] fully printed washable electronics on fabrics, [10] and imperceptible logic circuitry on ultrathin substrates for intelligent electronic skin. This promise stemmed from the prospect of utilizing printing tools derived from well-established graphical arts technologies to deposit a variety of functional materials, which exhibit a suitable combination of mechanical and electronic properties.…”

Section: Introductionmentioning

confidence: 99%

Accessing MHz Operation at 2 V with Field‐Effect Transistors Based on Printed Polymers on Plastic

Perinot

Caironi

2018

Advanced Science

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Organic printed electronics are suitable for the development of wearable, lightweight, distributed applications in combination with cost‐effective production processes. Nonetheless, some necessary features for several envisioned disruptive mass‐produced products are still lacking: among these radio‐frequency (RF) communication capability, which requires high operational speed combined with low supply voltage in electronic devices processed on cheap plastic foils. Here, it is demonstrated that high‐frequency, low‐voltage, polymer field‐effect transistors can be fabricated on plastic with the sole use of a combination of scalable printing and digital laser‐based techniques. These devices reach an operational frequency in excess of 1 MHz at the challengingly low bias voltage of 2 V, and exceed 14 MHz operation at 7 V. In addition, when integrated into a rectifying circuit, they can provide a DC voltage at an input frequency of 13.56 MHz, opening the way for the implementation of RF devices and tags with cost‐effective production processes.

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“…[1][2][3] Crystalline silicon technology can be challenging to apply in fabrication and distribution of electronics over a large area, mainly due to high processing and manufacturing cost per unit area in addition to the high cost of single crystal wafer substrates. [1][2][3] Crystalline silicon technology can be challenging to apply in fabrication and distribution of electronics over a large area, mainly due to high processing and manufacturing cost per unit area in addition to the high cost of single crystal wafer substrates.…”

Section: Introductionmentioning

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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Current Status and Opportunities of Organic Thin-Film Transistor Technologies

Cited by 235 publications

References 169 publications

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

The Polymer Physics of Multiscale Charge Transport in Conjugated Systems

Accessing MHz Operation at 2 V with Field‐Effect Transistors Based on Printed Polymers on Plastic

Printed Flexible Organic Transistors with Tunable Aspect Ratios

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