Flexible organic field-effect transistor fabricated by thermal press process

Inoue, Akihisa; Okamoto, T.; Sakai, Masatoshi; Kuniyoshi, Shigekazu; Nakamura, Masakazu; Kudo, Kazuhiro

doi:10.1002/pssa.201228776

Cited by 18 publications

(12 citation statements)

References 52 publications

(44 reference statements)

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“…We have also carried out experiments on flexible organic field effect transistors (FETs) using the thermal press method . The thermal press method is a method by which to make organic thin film transistors by melting and spreading organic materials between two flexible films.…”

Section: Introductionmentioning

confidence: 99%

Mechanical analysis of organic flexible devices by finite element calculation

Sakai¹,

Yamazaki²,

Yamaguchi³

et al. 2013

Physica Status Solidi (a)

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In recent years, organic flexible devices have been investigated extensively and sub‐millimeter bending stability of organic thin film devices has been achieved by placing the active layer of the transistor on a neutral strain surface. Around the neutral strain surface, an organic thin film has a high bending durability because the in‐plane tensile and compressive strain cancel each other. However, this type of highly flexible device is also destroyed or undergoes irreversible degradation when subjected to hard bending, and the breaking point is very difficult to detect experimentally. Therefore, we performed a finite element analysis of a flexible device and found a possible breaking point at the boundary between the contact electrode and the organic layer. This was the result of a strain concentration at the boundary due to the difference in Young's modulus of the organic semiconductor and Au. In addition, the shear stress is concentrated around the edge of the Au electrode. These results indicate that the most likely breaking point for this type of flexible transistor is a rupture of the organic layer at the interface with the Au electrode.

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Section: Introductionmentioning

confidence: 99%

Mechanical analysis of organic flexible devices by finite element calculation

Sakai¹,

Yamazaki²,

Yamaguchi³

et al. 2013

Physica Status Solidi (a)

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“…Two substrates were prepared using the same procedures described in our previous work [26][27][28][29]. The first substrate was a thin hybrid polyimide film (POMI-RAN N) provided by Arakawa Chemical Industries, Ltd., Japan.…”

Section: Methodsmentioning

confidence: 99%

“…Although inkjet and other printers designed for printed electronics are already commercially available, solventfree printing is not. We previously developed a solventfree thin-film fabrication process that involves thermal pressing [26], thermal lamination [27,28], and ultrasonic * Corresponding Author: sakai@faculty.chiba-u.jp welding [29]. A thermal press was developed to prepare thin films of organic materials by thermally compressing the organic materials with two planar clamps [26].…”

Section: Introductionmentioning

confidence: 99%

“…We previously developed a solventfree thin-film fabrication process that involves thermal pressing [26], thermal lamination [27,28], and ultrasonic * Corresponding Author: sakai@faculty.chiba-u.jp welding [29]. A thermal press was developed to prepare thin films of organic materials by thermally compressing the organic materials with two planar clamps [26]. Next, a thermal lamination method was developed by replacing the thermal planar press with thermal rollers for thin-film formation with a roll-to-roll scheme [27,28].…”

Section: Introductionmentioning

confidence: 99%

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Solvent-Free Toner Printing of Organic Semiconductor Layer in Flexible Thin-Film Transistors

et al. 2017

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A solvent-free printing process for printed electronics was successfully developed using toner-type patterning of organic semiconductor toner particles and subsequent thin-film formation. These processes use the same principle as that used for laser printing. The organic thin-film transistors were prepared by electrically distributing the charged toner onto a Au electrode on a substrate film followed by thermal lamination. The thermal lamination was effective for obtaining an oriented and crystalline thin film. Toner printing is environmentally friendly compared with other printing technologies because it is solvent free, saves materials, and enables easy recycling. In addition, this technology simultaneously enables both wide-area and high-resolution printing.

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“…Inoue et al. demonstrated that they integrated a thermal pressing method with melt‐recrystallization to fabrication OFETs on a plastic film . The semiconductor material with a low melting point could be melted and compressed with pressure to gain a thin active layer.…”

Section: Crystal Growth Strategies For Oscssmentioning

confidence: 99%

Organic Single‐Crystalline Semiconductors for Light‐Emitting Applications: Recent Advances and Developments

Ding

Feng

et al. 2019

Laser & Photonics Reviews

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Organic single‐crystalline semiconductors (OSCSs), as a vital branch of organic semiconductors, have recently attracted intense interest due to their numerous advantages such as highly ordered structure, high carrier mobility, high thermal stability, and low impurity levels, and they have worldwide use in different kinds of applications. In particular, the nature of better luminescence properties and remarkable charge‐transport characteristics is a prerequisite for light‐emitting aspects. Here, a concise overview of the recent progress on OSCSs research is provided, highlighting the prominent properties of OSCSs which are pertinent to light‐emitting behavior. Various crystal‐growth strategies are surveyed for the preparation of high‐quality OSCSs via solution, melting, and vapor phases. Two typical electrical‐pumping light‐emitting devices, including organic light‐emitting transistors and organic light‐emitting diodes, are summarized with recent advances and developments exhibiting the latent potentialities of OSCSs in optoelectronics.

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Flexible organic field-effect transistor fabricated by thermal press process

Cited by 18 publications

References 52 publications

Mechanical analysis of organic flexible devices by finite element calculation

Mechanical analysis of organic flexible devices by finite element calculation

Solvent-Free Toner Printing of Organic Semiconductor Layer in Flexible Thin-Film Transistors

Organic Single‐Crystalline Semiconductors for Light‐Emitting Applications: Recent Advances and Developments

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