Improvement of subthreshold current transport by contact interface modification in p-type organic field-effect transistors

Thienoacenes consist of fused thiophene rings in a ladder-type molecular structure and have been intensively studied as potential organic semiconductors for organic field-effect transistors (OFETs) in the last decade. They are reviewed here. Despite their simple and similar molecular structures, the hitherto reported properties of thienoacene-based OFETs are rather diverse. This Review focuses on four classes of thienoacenes, which are classified in terms of their chemical structures, and elucidates the molecular electronic structure of each class. The packing structures of thienoacenes and the thus-estimated solid-state electronic structures are correlated to their carrier transport properties in OFET devices. With this perspective of the molecular structures of thienoacenes and their carrier transport properties in OFET devices, the structure-property relationships in thienoacene-based organic semiconductors are discussed. The discussion provides insight into new molecular design strategies for the development of superior organic semiconductors.

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“…[ 100 ] A similar effect of the contact resistance between the semiconductor and the electrode was observed for vapor-deposited 33b - [ 60b ]…”

Section: Fet Characteristics and Solid-state Packing Structuressupporting

confidence: 60%

Thienoacene‐Based Organic Semiconductors

et al. 2011

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“…36 The transistor electrodes doped by TMOs can markedly increase the μ FET and lower the threshold voltage. [37][38][39] It was also reported that aqueous TMO solutions can be used for the doping process in solution-processed devices. 40,41 As shown in Figure 5a and Supplementary Figure S10, the hydrophilic source/drain electrodes on the hydrophobic substrate, combined with the Cytop guide layer, efficiently guide the spontaneous location of aqueous dopant solutions for the precise deposition of dopants.…”

Section: Resultsmentioning

confidence: 99%

Homogeneous dewetting on large-scale microdroplet arrays for solution-processed electronics

Liu

Sakamoto

et al. 2017

NPG Asia Mater

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Unidirectional dewetting enables the production of large-area thin films with high efficiency at low cost. Herein, we report homogeneous unidirectional dewetting on large-area microdroplet arrays via gravity-induced deformation in droplets combined with alternating lyophilic/lyophobic patterns. This process allows the scaled-up deposition of thin films, including organic semiconductors and transition metal oxides, through the autogenous shrinkage of droplets, which further enables the fabrication of large-area organic thin-film transistor (OTFT) arrays. The resulting field-effect mobility and on/off ratio of the fully printed OTFTs exceeded 13 cm 2 V − 1 s − 1 and 10 8 , respectively. Therefore, the presented dewetting method is promising to realize the roll-to-roll manufacture of large-area flexible electronics.

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“…Various research groups focus on materials such as dinaphtho(2,3-b:2′,3′-f)thieno (3,2-b)thiophene (Cn-DNTT) and 2,7-dioctyl(1)benzothieno(3,2-b)(1)benzothiophene (C8-BTBT), which can be deposit by thermal evaporation or from solutions, respectively [13][14][15][16]. Currently, the highest achieved field-effect mobility is about 43 cm 2 /Vs for C8-BTBT deposited by a special off-centered spin-coating technique [17].…”

Section: Integrationmentioning

confidence: 99%

Flexible Electronics: Integration Processes for Organic and Inorganic Semiconductor-Based Thin-Film Transistors

2015

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Flexible and transparent electronics have been studied intensively during the last few decades. The technique establishes the possibility of fabricating innovative products, from flexible displays to radio-frequency identification tags. Typically, large-area polymeric substrates such as polypropylene (PP) or polyethylene terephthalate (PET) are used, which produces new requirements for the integration processes. A key element for flexible and transparent electronics is the thin-film transistor (TFT), as it is responsible for the driving current in memory cells, digital circuits or organic light-emitting devices (OLEDs). In this paper, we discuss some fundamental concepts of TFT technology. Additionally, we present a comparison between the use of the semiconducting organic small-molecule pentacene and inorganic nanoparticle semiconductors in order to integrate TFTs suitable for flexible electronics. Moreover, a technique for integration with a submicron resolution suitable for glass and foil substrates is presented.

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Improvement of subthreshold current transport by contact interface modification in p-type organic field-effect transistors

Cited by 168 publications

References 16 publications

Thienoacene‐Based Organic Semiconductors

Thienoacene‐Based Organic Semiconductors

Homogeneous dewetting on large-scale microdroplet arrays for solution-processed electronics

Flexible Electronics: Integration Processes for Organic and Inorganic Semiconductor-Based Thin-Film Transistors

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