Structure and Properties of Small Molecule−Polymer Blend Semiconductors for Organic Thin Film Transistors

Kang, Jihoon; Shin, Nayool; Jang, Do Young; Prabhu, Vivek M.; Yoon, Do Y.

doi:10.1021/ja804013n

Cited by 233 publications

(234 citation statements)

References 15 publications

(26 reference statements)

Supporting

Mentioning

219

Contrasting

Order By: Relevance

“…17). The higher mobility with PS may be due to enhanced inter-grain connectivity, because the increased solution viscosity helped to form more continuous films, as has been observed with other small molecule/polymer blends 36,37 . Another important contributing factor is the vertical phase separation, which generally occurs in polymer and small molecule blends 36,38 and would result in reduced surface traps in our devices.…”

Section: Discussionmentioning

confidence: 72%

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

et al. 2014

View full text Add to dashboard Cite

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.

show abstract

Section: Discussionmentioning

confidence: 72%

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

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The inset shows the fitted concentration profiles of TIPS-pentacene [47]. Regardless of thermal annealing, TIPS-pentacene is placed both at the surface and interface of the film.…”

Section: Processing Additivementioning

confidence: 99%

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

Lee

Park

2014

Polymers

View full text Add to dashboard Cite

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.

show abstract

“…[8][9][10][11] Achieving continuous thin film formation via solution processing can be challenging due to molecular shape and packing anisotropies and a propensity to dewet. [12][13] Forming films with excellent substrate coverage and lamellar texture also requires crystallization to be initiated from the solid-liquid interface, [14] while slight fluctuations in drying conditions and extended solvent vapor exposure can strongly impact the film formation and degree of crystallinity. [15,16] conditions and the resulting morphology in terms of phase separation and crystallization of the OSC within the blends, as well as the corresponding device performance is still in its infancy for small molecule-polymer blends, but some of the desirable features are clearly identified.…”

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

104

100

View full text Add to dashboard Cite

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.

show abstract

Structure and Properties of Small Molecule−Polymer Blend Semiconductors for Organic Thin Film Transistors

Cited by 233 publications

References 15 publications

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

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

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

Contact Info

Product

Resources

About