Thienoacene‐Based Organic Semiconductors

Takimiya, Kazuo; Shoji, Shuichi; Osaka, Itaru; Miyazaki, Eigo

doi:10.1002/adma.201102007

Cited by 919 publications

(641 citation statements)

References 161 publications

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“…16). The observed isotropic mobility is reasonable because the charge transfer integrals along different directions are roughly balanced 16,24 . However, the high degree of alignment will still be a contributing factor to the high mobility value because such an alignment reduces the grain boundary scattering 30 .…”

Section: Discussionmentioning

confidence: 63%

“…The carrier mobility of organic semiconductor films is strongly influenced by the crystallinity, molecular packing structures of the organic thin films and charge traps at the gate dielectric/ semiconductor interface [14][15][16][17] . Because of the small van der Waals interaction between organic molecules, the crystallinity, grain size and crystal alignment of the solution-processed organic thin films have been shown to be very sensitive to the fabrication conditions, such as solvent evaporation rate 18 , and liquid surface tension force 19,20 .…”

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confidence: 99%

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Ultra-high mobility transparent organic thin film transistors grown by an off-centre spin-coating method

et al. 2014

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Organic semiconductors with higher carrier mobility and better transparency have been actively pursued for numerous applications, such as flat-panel display backplane and sensor arrays. The carrier mobility is an important figure of merit and is sensitively influenced by the crystallinity and the molecular arrangement in a crystal lattice. Here we describe the growth of a highly aligned meta-stable structure of 2,7-dioctyl[1]benzothieno [3,2-b][1]benzothiophene (C8-BTBT) from a blended solution of C8-BTBT and polystyrene by using a novel offcentre spin-coating method. Combined with a vertical phase separation of the blend, the highly aligned, meta-stable C8-BTBT films provide a significantly increased thin film transistor hole mobility up to 43 cm 2 Vs À 1 (25 cm 2 Vs À 1 on average), which is the highest value reported to date for all organic molecules. The resulting transistors show high transparency of 490% over the visible spectrum, indicating their potential for transparent, high-performance organic electronics.

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Section: Discussionmentioning

confidence: 63%

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confidence: 99%

Ultra-high mobility transparent organic thin film transistors grown by an off-centre spin-coating method

et al. 2014

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“…BTBT and its derivatives are typical small organic semiconductors with high charge mobilities. 33 However, only few conjugated polymers based on BTBT were reported due to the limited solubility of BTBT, and the polymer with BTBT showed no OFET characteristics owing to a highly twisted backbone. 34 Terpolymers P3a-P3b and P4a-P4c can be dissolved in o-dichlorobenzene.…”

Section: Conjugated D-a Terpolymers For Applications In Ofetsmentioning

confidence: 99%

Conjugated D–A terpolymers for organic field-effect transistors and solar cells

Luo

Liu

Zhang

2017

Polym J

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The incorporation of additional electron donors or acceptors into the backbones of conjugated polymers with alternating donors and acceptors results in various conjugated D-A terpolymers. The presence of additional electron donors or acceptors in the conjugated backbones can modulate the electronic absorptions and highest occupied molecular orbital/lowest unoccupied molecular orbital levels, as well as interchain interactions and thin-film morphology. Because of these structural features, conjugated D-A terpolymers have been intensively investigated in recent years for applications in field-effect transistors and photovoltaic cells. In this review, we introduce the recent developments of conjugated D-A terpolymers with various combinations of electron donors and acceptors, and discuss the future perspectives for conjugated terpolymers. In recent decades, conjugated polymers have demonstrated promising applications in flexible, large-area and low-cost electronic devices, such as organic field-effect transistors (OFETs) 1-3 and solar cells (OSCs). [4][5][6][7] This is attributed to the conjugated electronic and polymeric structures of these polymers, resulting in semiconducting properties with good solution processability, mechanical property and thermal stability. 8,9 Among the conjugated polymers, conjugated alternating polymers consisting of both electron donors (D) and electron acceptors (A), referred to as conjugated D-A polymers, [10][11][12][13][14][15][16][17] have been extensively investigated in recent years. The studies indicate that electronic absorptions, highest occupied molecular orbital/lowest unoccupied molecular orbital (HOMO/LUMO) energies (and bandgaps), interchain interactions and thin-film morphologies of conjugated D-A polymers can be effectively tuned 10-17 by properly varying the electron donors and acceptors as well as the linkers. Consequently, the semiconducting performance of conjugated D-A polymers can be tuned in this way. In fact, polymeric p-type, n-type and even ambipolar semiconductors with high charge mobilities have been developed on the basis of conjugated D-A polymers. 18-21 Moreover, conjugated D-A polymers have been successfully utilized as either electron donors or acceptors for OSCs with high power conversion efficiencies (PCEs). [22][23][24][25] Apart from conjugated polymers with alternating electron donor and acceptor moieties, conjugated D-A terpolymers, which contain either one kind of acceptor/two types of electron donors (2D1A) or one kind of donor/two types of electron acceptors (1D2A) in the backbones as illustrated in Scheme 1, have received increased attention. It is expected that an additional dimension is generated for tuning the electronic structures of conjugated polymers and thus their absorptions and HOMO/LUMO levels as well as interchain packing 8,26 with such conjugated D-A terpolymers. Moreover, the combination of existing electron donors and acceptors can yield a huge number of terpolymers, which can be prepared in the same manner as conventional D-A ...

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“…The single crystal DNTT based OFETs showed typical p-channel MOS-FET characteristics and a high field-effect mobility of up to 2.4 cm 2 V -1 s -1 was achieved. Compounds based on this type of fused chalcogenophene compounds are widely investigated and known to be air-stable and high-performance p-channel transistor materials [13][14][15][16][17][18]. In this study, we synthesize a new type of fused chalcogenophene based transistor material, (4,4'- Figure 1), and investigate the characterization of single crystal OFETs based on the newly developed material.…”

Section: Introductionmentioning

confidence: 99%