High‐Performance Organic Single‐Crystal Transistors on Flexible Substrates

Briseño, Alejandro L.; Tseng, Ricky J.; Ling, Mang-Mang; Falcão, Eduardo H.L.; Yang, Yang; Wudl, Fred; Bao, Zhenan

doi:10.1002/adma.200600634

Cited by 322 publications

(258 citation statements)

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“…Within this effort, there are a few papers that perform tests of mechanical flexibility of organic devices and investigate the dependence of their performance on mechanical strain. For example, Briseno et al 4 developed high-performance flexible single-crystal rubrene OFETs on Kapton substrates with a field-effect mobility mB5 cm 2 V À 1 s À 1 that could be bent to a radius of RB6 mm without degradation. Sekitani et al 5 made an important next step toward more practical devices and demonstrated vacuumevaporated pentacene OFETs supported by polyimide substrates with mobility mB0.5 cm 2 V À 1 s À 1 that could be bent to a radius of RB3.5 mm (for devices without encapsulation) and down to 100 mm (for devices encapsulated in parylene).…”

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confidence: 99%

Ultra-flexible solution-processed organic field-effect transistors

et al. 2012

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Organic semiconductors might enable new applications in low-cost, light-weight, flexible electronics. To build a solid foundation for these technologies, more fundamental studies of electro-mechanical properties of various types of organic semiconductors are necessary. Here we perform basic studies of charge transport in highly crystalline solution-processed organic semiconductors as a function of applied mechanical strain. As a test bed, we use small molecules crystallized on thin plastic sheets, resulting in high-performance flexible field-effect transistors. These devices can be bent multiple times without degradation to a radius as small as B200 mm, demonstrating that crystalline solution-processed organic semiconductors are intrinsically highly flexible. This study of electro-mechanical properties suggests that solution-processable organic semiconductors are suitable for applications in flexible electronics, provided that integration with other important technological advances, such as device scalability and low-voltage operation, is achieved in the future.

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confidence: 99%

Ultra-flexible solution-processed organic field-effect transistors

et al. 2012

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“…Previously, it has been reported that thinner crystals often lead to better OFET performances because the bulk resistance should reduce with decreasing active-layer thickness in the bottomgate, top-contact OFETs. 11 In the present study, however, all microribbons formed by ³-extended thienoacenes are thin enough (<100 nm) to minimize the effects of the resistance, so can fabricate high-performance single-crystal transistors.…”

Section: Resultsmentioning

confidence: 99%

Organic Single-Crystal Transistors Based on π-Extended Heteroheptacene Microribbons

Yang

Yasuda

Adachi

2012

Bulletin of the Chemical Society of Japan

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Facile synthesis of a new series of ³-extended thienoacenes has been described. Their electronic structures have been elucidated by UVvis absorption and photoelectron spectra. Well-defined single-crystal microribbons composed of self-organized thienoacene molecules have been fabricated using physical vapor transport, and have been applied to field-effect transistors. The organic transistors employing the single-crystal microribbons exhibit mobilities as high as 0.47 cm 2 V s ¹1 with on/off ratios of ca. 10 6 .Due to the rapid progress in organic electronics, the development of high-performance organic semiconductors continues to be a crucial area of research.1,2 Organic field-effect transistors (OFETs) have attracted great interest, 2,3 as a low-cost alternative to traditional silicon transistors for their use in electronics applications, including active-matrix displays, circuits, and radio-frequency identification (RFID) devices. 4 The design and synthesis of novel ³-conjugated materials with comprehensively excellent properties and sophisticated self-organized structures are major challenges to enhance the OFET performance.Compared with OFETs based on organic thin films, those using organic single crystals (e.g., pentacene and rubrene) can produce significantly enhanced carrier transport functionality on account of their near-perfect molecular order and defect-free morphologies.5 Recently, high-performance OFETs have successfully been demonstrated using one-dimensional (1D) nanoor microsized organic crystalline materials. 6 One can expect that the construction of linearly ³-extended oligoacene structures leads to further enhancement of intermolecular ³-orbital overlap (or transfer integrals) and carrier transport properties of the materials. Nevertheless, so far, there are only a few reports on stable ³-conjugated oligoacenes with more than six fused rings as organic semiconductors.7 Moreover, most of these materials still suffer from a complicated synthesis and bothersome purification processes.We herein disclose the facile synthesis, photophysical properties, self-organization, and OFET properties of sevenring-fused ³-extended thienoacenes (Figure 1 Results and DiscussionSynthesis and Characterization. The synthetic procedures used to prepare new thienoacenes are outlined in Scheme 1 (see Experimental for details). The SuzukiMiyaura cross-coupling reactions between 1,4-dibromo-2,5-bis(methylsulfinyl)benzene (1) and the corresponding boronic acids with [Pd(PPh 3 ) 4 ] as a catalyst afforded key precursors 24 in 7380% yields. Compounds 24 having methylsulfinyl groups were subsequently converted into TTBDT, BTBDT, and BFBDT, respectively, in 6795% yields, via intramolecular double cycliza-

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“…Despite having synthesized a number of semiconducting organic crystals so far [309], only a few of them were successfully processed into samples fit for transport measurements and still fewer were available into few micronsized freestanding single crystals [320][321][322][323][324][325][326][327]. This clearly explains why there is a need for going into thin-film-based device development and not on large-sized wafers as in the case of Si and other inorganic semiconductors.…”

Section: Organic Single Crystalsmentioning

confidence: 99%

Organic semiconductors for device applications: current trends and future prospects

Ahmad

2014

Journal of Polymer Engineering

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Abstract:With the rich experience of developing silicon devices over a period of the last six decades, it is easy to assess the suitability of a new material for device applications by examining charge carrier injection, transport, and extraction across a practically realizable architecture; surface passivation; and packaging and reliability issues besides the feasibility of preparing mechanically robust wafer/substrate of single-crystal or polycrystalline/ amorphous thin films. For material preparation, parameters such as purification of constituent materials, crystal growth, and thin-film deposition with minimum defects/ disorders are equally important. Further, it is relevant to know whether conventional semiconductor processes, already known, would be useable directly or would require completely new technologies. Having found a likely candidate after such a screening, it would be necessary to identify a specific area of application against an existing list of materials available with special reference to cost reduction considerations in large-scale production. Various families of organic semiconductors are reviewed here, especially with the objective of using them in niche areas of large-area electronic displays, flexible organic electronics, and organic photovoltaic solar cells. While doing so, it appears feasible to improve mobility and stability by adjusting π-conjugation and modifying the energy bandgap. Higher conductivity nanocomposites, formed by blending with chemically conjugated C-allotropes and metal nanoparticles, open exciting methods of designing flexible contact/interconnects for organic and flexible electronics as can be seen from the discussion included here.

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High‐Performance Organic Single‐Crystal Transistors on Flexible Substrates

Cited by 322 publications

References 29 publications

Ultra-flexible solution-processed organic field-effect transistors

Ultra-flexible solution-processed organic field-effect transistors

Organic Single-Crystal Transistors Based on π-Extended Heteroheptacene Microribbons

Organic semiconductors for device applications: current trends and future prospects

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