Solution-processed organic thin-film transistors with vertical nanophase separation

Ohe, Takahiro; Kuribayashi, Miki; Yasuda, Ryoichi; Tsuboi, Ami; Nomoto, Kazumasa; Satori, Kotaro; Itabashi, Masao; Kasahara, J.

doi:10.1063/1.2966350

Cited by 114 publications

(130 citation statements)

References 12 publications

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“…Although the reason for this dual segregation was not revealed exactly, this structure, as shown in the inset of Figure 7b, provides an excellent charge transport pathway. Figure 7b shows comparative plots for OFETs based on a TIPS-pentacene: PαMS blended film (solid line) and sole-TIPS-pentacene (broken line) [48]. The TIPS-pentacene: PαMS blended film exhibited electrical properties comparable to sole-TIPS-pentacene.…”

Section: Processing Additivementioning

confidence: 99%

Organic Semiconductor/Insulator Polymer Blends for High-Performance Organic Transistors

Lee

Park

2014

Polymers

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Abstract:We reviewed recent advances in high-performance organic field-effect transistors (OFETs) based on organic semiconductor/insulator polymer blends. Fundamental aspects of phase separation in binary blends are discussed with special attention to phase-separated microstructures. Strategies for constructing semiconductor, semiconductor/dielectric, or semiconductor/passivation layers in OFETs by blending organic semiconductors with an insulating polymer are discussed. Representative studies that utilized such blended films in the following categories are covered: vertical phase-separation, processing additives, embedded semiconductor nanowires.

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Section: Processing Additivementioning

confidence: 99%

Organic Semiconductor/Insulator Polymer Blends for High-Performance Organic Transistors

Lee

Park

2014

Polymers

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“…[26] Ohe et al reported TIPSpentacene accumulation and stratification at both interfaces with poly(α-methyl styrene) (PαMS) in the middle, pointing to the influence of the substrate on the phase separation outcome. [18] The nature of the polymer structure also plays a role in mediating the vertical phase separation. Blending TIPS-pentacene with a semi-crystalline isotactic polystyrene (i-PS) was reported to form stratification with small molecules segregating to the interfaces; [17] whereas semi-crystalline syndiotactic polystyrene (s-PS) was found to inhibit the segregation and crystallization of diF-TESADT.…”

Section: Introductionmentioning

confidence: 99%

Vertical Phase Separation in Small Molecule:Polymer Blend Organic Thin Film Transistors Can Be Dynamically Controlled

Wodo

Ren

Khan

et al. 2016

Adv Funct Materials

107

100

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Abstract:Blending of small-molecule organic semiconductors (OSCs) with amorphous polymers is known to yield high performance organic thin film transistors (OTFTs). Vertical stratification of the OSC and polymer binder into well-defined layers is crucial in such systems and their vertical order determines whether the coating is compatible with a top and/or a bottom gate OTFT configuration. Here, we investigate the formation of such blends prepared via spincoating in conditions which yield bilayer and trilayer stratifications, and use a combination of experimental and computational tools to study the competing effects of formulation thermodynamics and process kinetics in mediating the final vertical stratification. We show that trilayer stratification (OSC/polymer/OSC) is the thermodynamically favored configuration and that formation of the buried OSC layer can be kinetically inhibited in certain conditions of spincoating, resulting in a bilayer stack instead. Our analysis reveals that preferential loss of the Zhao et al., Adv. Func. Mater. 2016 2 OSC, combined with early aggregation of the polymer phase due to rapid drying, inhibit the formation of the buried OSC layer. We then moderate the fluid dynamics and drying kinetics during spin-coating to promote trilayer stratification with a high quality buried OSC layer which yields unusually high mobility >2 cm 2 V -1 s -1 in the bottom-gate top-contact configuration.

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“…Although a lot of research has been published on the advances of using printed TIPS-pentacene in which different research groups have built organic field-effect transistors (OFET) with mobility in the saturation regime greater than 1 cm 2 /Vs [5,6], most organic semiconductor (OSC) circuitry is still based on evaporated pentacene due to the reproducibility and homogeneity of the results. This is due to the inherent problem that plagues TIPS-pentacene and other such small molecule semiconductors that the poor control of the phase distribution and morphology leads to a wider disparity in the device-to-device performance [7].…”

Section: Introductionmentioning

confidence: 99%

Homogeneous Crystallization of Micro-DispensedTIPS-Pentacene Using a Two-Solvent System toEnable Printed Inverters on Foil Substrates

et al. 2015

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Abstract:We report on a micro-dispensing system for 6,13-Bis(triisopropylsilylethynyl) pentacene (TIPS-pentacene) to enable homogenous crystallization and uniform film morphology of the dispensed droplets using a two-solvent mixture along with the use of an insulating binder. This solution composition results in a controlled evaporation of the droplet in ambient air such that the Marangoni flow counteracts the outward convective flow to enable uniform radial crystal growth from the edge towards the center of the drops. The consequence of this process is the high degree of uniformity in the crystallization of the drops, which results in a reduction in the performance spread of the organic field effect transistors (OFET) created using this process. The addition of the insulating binder further improves the reduction in the spread of the results as a trade-off to the reduction in mobility of the transistors. The transfer curves of the OFETs show a tight grouping due to the controlled self-alignment of the TIPS-pentacene crystals; this repeatability was further highlighted by fabricating p-type inverters with driver to load ratios of 8:1, wherein the output inverter curves were also grouped tightly while exhibiting a gain of greater than 4 in the switching region. Therefore, the reliability and repeatability of this process justifies its use to enable large area solution-processed printed circuits at the cost of reduced mobility. OPEN ACCESSElectronics 2015, 4 566

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Solution-processed organic thin-film transistors with vertical nanophase separation

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Cited by 114 publications

References 12 publications

Organic Semiconductor/Insulator Polymer Blends for High-Performance Organic Transistors

Organic Semiconductor/Insulator Polymer Blends for High-Performance Organic Transistors

Vertical Phase Separation in Small Molecule:Polymer Blend Organic Thin Film Transistors Can Be Dynamically Controlled

Homogeneous Crystallization of Micro-DispensedTIPS-Pentacene Using a Two-Solvent System toEnable Printed Inverters on Foil Substrates

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