Organic field effect transistors from ambient solution processed low molar mass semiconductor–insulator blends

Madec, Marie-Beatrice; Crouch, David J.; Llorente, Gonzalo Rincon; Whittle, Tracie J.; Geoghegan, Mark; Yeates, Stephen G.

doi:10.1039/b802801j

Cited by 118 publications

(104 citation statements)

References 22 publications

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“…Thus, a processing additive that enhances coverage of the film is necessary. Common insulator polymers such as PMMA and poly(α-methylstyrene) (PαMS) can be used as processing additives [44][45][46]. When a TIPS-pentacene: PαMS blended solution is cast on a substrate consisting of gate, gate-dielectric, and source/drain electrodes, vertical phase-separation should be controlled adequately to enable lateral charge transport.…”

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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“…[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. [27] Smith et al further found that amorphous semi-conducting polymer could mediate conduction across grain boundaries in diF-TES-ADT-rich regions when the diF-TES-ADT layer crystallizes on top of the poly(triarylamine) (PTAA) or poly(dialkylfluorene-co-dimethyl-triarylamine) (PF-TAA), for bottom-contact top-gate (BCTG)…”

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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“…Small molecule organic semiconductors, such as 6,13-bis(triisopropylsilylethynyl) (TIPS) pentacene, have been found to exhibit a very high charge carrier mobility (> 1 cm 2 V -1 s -1 ) [10,11] because the molecules arrange into a well-organised polycrystalline structure [12,13]. However, difficulties in the solution processing of TIPS-pentacene, stemming from the anisotropy of crystal formation [14], restricts its use in large-area deposition.…”

Section: Introductionmentioning

confidence: 99%

High charge-carrier mobilities in blends of poly(triarylamine) and TIPS-pentacene leading to better performing X-ray sensors

Intaniwet

Keddie

Shkunov

et al. 2011

Organic Electronics

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Organic field effect transistors from ambient solution processed low molar mass semiconductor–insulator blends

Cited by 118 publications

References 22 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

High charge-carrier mobilities in blends of poly(triarylamine) and TIPS-pentacene leading to better performing X-ray sensors

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