Single‐Crystal‐Like Organic Thin‐Film Transistors Fabricated from Dinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (DNTT) Precursor–Polystyrene Blends

Hamaguchi, Azusa; Negishi, Tsuyoto; Kimura, Yu; Ikeda, Yuichi; Takimiya, Kazuo; Bisri, Satria Zulkarnaen; Iwasa, Yoshihiro; Takano, Shiro

doi:10.1002/adma.201502413

Cited by 47 publications

(51 citation statements)

References 30 publications

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“…For these reasons, the well‐known, highest mobility small molecules have been widely researched in small‐molecule/polymer blend systems, i.e., 6,13‐bis(triisopropylsilylethynyl)pentacene (TIPS‐pentacene), rubrene, dif‐TES ADT and 2,7‐dioctyl[1]benzothieno[3,2‐ b ][1]benzothiophene (C 8 ‐BTBT) . A number of variables have been found to have a strong influence on how the small‐molecule nucleates in blend systems, and hence determine the mobility, such as solvent choice (including poor solvent introduction), blend ratio, processing and substrate temperature, surface treatment/wetting, and indeed the polymer binder in terms of molecular weight and whether it has amorphous or semicrystalline properties …”

Section: Molecular Semiconductor/polymer Blendsmentioning

confidence: 99%

Recent Progress in High‐Mobility Organic Transistors: A Reality Check

et al. 2018

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Over the past three decades, significant research efforts have focused on improving the charge carrier mobility of organic thin-film transistors (OTFTs). In recent years, a commonly observed nonlinearity in OTFT current-voltage characteristics, known as the "kink" or "double slope," has led to widespread mobility overestimations, contaminating the relevant literature. Here, published data from the past 30 years is reviewed to uncover the extent of the field-effect mobility hype and identify the progress that has actually been achieved in the field of OTFTs. Present carrier-mobility-related challenges are identified, finding that reliable hole and electron mobility values of 20 and 10 cm V s , respectively, have yet to be achieved. Based on the analysis, the literature is then reviewed to summarize the concepts behind the success of high-performance p-type polymers, along with the latest understanding of the design criteria that will enable further mobility enhancement in n-type polymers and small molecules, and the reasons why high carrier mobility values have been consistently produced from small molecule/polymer blend semiconductors. Overall, this review brings together important information that aids reliable OTFT data analysis, while providing guidelines for the development of next-generation organic semiconductors.

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Section: Molecular Semiconductor/polymer Blendsmentioning

confidence: 99%

Recent Progress in High‐Mobility Organic Transistors: A Reality Check

et al. 2018

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“…This result proves that the grain boundaries of the printed C 6 ‐DPA are the main cause of the decrease in mobility as well as the relatively large mobility variation between different devices in the array. It also indicates that achieving highly uniform thin films with fewer grain boundaries and other defects is the key step to reach high‐performance devices . Further improving of the film quality could be achieved by optimizing the solvent selection, polymer blending ratio and concentration or applying post vapor annealing process .…”

Section: Comparison Of the Electrical Characteristics Of Recently Repmentioning

confidence: 99%

Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays

et al. 2019

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printing methods on various desirable substrates. Many soluble small-molecule organic semiconductors with high carrier mobility have been developed over the past decade, such as [1] benzothieno [3,2-b] benzothiophene (BTBT) derivatives. [11] The higher field-effect mobility of smallmolecule organic semiconductor (OSC) thin films is achieved with crystallization and crystal orientations, which are optimized for charge conduction. [12] Thus, state-of-the-art solution-processable OSCs have demonstrated excellent characteristics with better carrier mobility surpassing those of solution-processed metal oxides and amorphous silicon thin film transistors. [13,14] However, because of the vigorous crystallization of small-molecule organic semiconductors during the solvent evaporation, the polycrystalline domains with uncontrollable orientations and sizes are frequently developed, which results in a notably nonuniform film morphology. Hence, devices with high mobility and device-to-device uniformity are difficult to fabricate. Various solution based methods have been developed to control the thin film crystallization, [15] such as solution shearing, [16] inkjet printing, [17] slot-die coating, [18] spray printing, [19] and screen printing. [20] Among these methods, screen printing is considered a simple, efficient, and low-cost method to fabricate electronic devices in industry. The printing process for one layer consumes only few seconds, which is efficient for the mass production of organic electronics. Previous studies on screen-printed electronics mainly focused on the printing of conducting materials and inorganic semiconductors using high viscosity ink. [21,22] Thus, the thickness of the printed film often relies on the thickness of emulsion of the screen, which is commonly up to few micrometers. Obviously, screen printing is not suitable for depositing OSC thin films of OFET because of the huge contact resistance caused by the micrometer-scale film thickness. Although some works have fabricated screen-printed OFET devices based on polymer OSCs, [23] the device performance (mobility ≈ 0.03 cm 2 V −1 s −1 ) is inadequate for various applications. Therefore, the development of a simple and low-cost printing approach that can directly fabricate highly Control over the morphology and crystallinity of small-molecule organic semiconductor (OSC) films is of key importance to enable high-performance organic optoelectronic devices. However, such control remains particularly challenging for solution-processed OSC devices because of the complex crystallization kinetics of small-molecule OSC materials in the dynamic flow of inks. Here, a simple yet effective channel-restricted screen-printing method is reported, which uses small-molecule OSCs/insulating polymer to yield largegrained small-molecule OSC thin-film arrays with good crystallization and preferred orientation. The use of cross-linked organic polymer banks produces a confinement effect to trigger the outward convective flow at two sides of the channel by the fast solv...

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“…Review PS, [166][167][168][169][171][172][173][174][175][176][177][178][179][180][181][182]213,214,299] poly(α-methylstyrene) (PαMS), [166][167][168][169][184][185][186][187][188][189][190][191][192] PMMA, [167,168,[193][194][195][196][197][198][199]260,300] poly(ε-caprolactone), [227] poly(vinyl cinnamate), [226] poly(α-vinyl naphthalene), [213] polyacrylates, [225] polycarbonate, [224] and PTAA and its derivatives. [186,…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

“…Therefore, polymer chains tend to remain in the middle of the film away from both interfaces, resulting in the tri-layered film. This approach can be applied to other solution-processing methods, such as spin coating, [181,186,204,205] inkjet printing, [198,213,214,220,224] blade or bar coating, [180,188,190] drop casting, [166,181,184] and scanning corona-discharge coating. [209] As a result of many efforts expended on this blend approach, diF-TES-ADT FETs with charge-carrier mobility values greater than 5 cm 2 V −1 s −1 have recently been reported, which is comparable to the result for a single-crystal device using the same material.…”

Section: Wileyonlinelibrarycommentioning

confidence: 99%

Effective Use of Electrically Insulating Units in Organic Semiconductor Thin Films for High‐Performance Organic Transistors

Kang

Qiu

et al. 2016

Adv Elect Materials

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The electrical properties of organic semiconductors (OSCs), whether they are conjugated small molecules or polymers, can be tailored by incorporating electrically insulating units (EIUs), which are organic moieties consisting of nonconjugated units. EIUs can be introduced to a thin film by synthetically connecting them to the otherwise conjugated OSC molecules or by blending them in as separate EIU molecules with the OSCs during the thin‐film fabrication process. The engineered EIUs are capable of imparting various additional functions to the OSC thin film and improving their electrical properties. In this review article, a comprehensive overview of various effects of EIUs on OSC thin films and their consequent electrical performance when used as active layers in organic field‐effect transistors (OFETs) is provided. A broad range of studies of the synthetic approaches of incorporating EIUs, such as those using side chains, block copolymers, and conjugation‐break spacers, and of the blending approaches with organic insulators is discussed. Finally, a brief summary and perspectives for future research in this field are presented.

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Single‐Crystal‐Like Organic Thin‐Film Transistors Fabricated from Dinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (DNTT) Precursor–Polystyrene Blends

Cited by 47 publications

References 30 publications

Recent Progress in High‐Mobility Organic Transistors: A Reality Check

Recent Progress in High‐Mobility Organic Transistors: A Reality Check

Scalable Fabrication of Highly Crystalline Organic Semiconductor Thin Film by Channel‐Restricted Screen Printing toward the Low‐Cost Fabrication of High‐Performance Transistor Arrays

Effective Use of Electrically Insulating Units in Organic Semiconductor Thin Films for High‐Performance Organic Transistors

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