Organic transistors based on airbrushed small molecule-insulating polymer blends with mobilities exceeding 1 cm2 V−1 s−1

Kaimakamis, T.; Pitsalidis, Charalampos; Papamichail, Alexis; Laskarakis, A.; Logothetidis, S.

doi:10.1039/c6ra22342g

Cited by 18 publications

(12 citation statements)

References 32 publications

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“…Indeed, the impact of fabrication techniques on the versatile blend system has been demonstrated a number of times over the years. Examples of fabrication techniques include spray deposition, line printing, air brushing, inkjet printing, dipping processes, vertical flow, blade coating, and off‐center spin coating …”

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 approach is especially attractive for low M w semiconductors. [34,37,62] Low viscosity and dewetting are common drawbacks of small molecules during film casting and blending with insulating polymers enhances their film forming properties. [63,64] Dip-coated films of α,ω-dihexylquaterthiophene (DH4T) and diketopyrrolopyrrolesexithiophene (DPP6T) exhibited a significant improvement in film formation and crystallization when blended with a small fraction of PMMA.…”

Section: Blends With Small Molecular Semiconductorsmentioning

confidence: 99%

Organic Semiconductor/Insulator Blends for Elastic Field‐Effect Transistors and Sensors

Janasz

Borkowski

Blom

et al. 2021

Adv Funct Materials

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Organic semiconductors encounter limitations in their practical applicability in future electronics due to their low environmental stability and poor charge carrier mobilities. Blending with isolation of thermoplastic polymers and elastomers circumvents these restrictions and even induces new material properties, opening the door to novel flexible and stretchable electronics that hold great potential for improving people's life. This review discusses next generation applications of solution processable organic semiconductor/insulator blends in organic field-effect transistors (OFETs). The fundamental basis is a comprehensive understanding of the phase separation mechanism that determines the morphology formation and electronic properties of the thin blend film. Continuous charge carrier pathways in blend OFETs are established by controlled phase separation through the chemical structure of components and the processing conditions. Recent advances in organic semiconductor/insulator blends with enhanced device properties including charge carrier mobility, life-time, sensing ability, and especially mechanical behavior are reviewed with emphasis on implication in flexible and stretchable electronics. The concept of tuning existing properties and creating new ones of electronically active materials by blending with well-selected insulators has great potential also for other types of electronic devices and classes of semiconductors.

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“…Madec et al 15 studied the effect of molecular weight of polymer binder and binary solvents on film growth and crystallinity of TIPS‐PEN. Furthermore, Kaimakamis et al 27 reported the effect of small molecule‐polymer ratio on device performance. Nevertheless, a mechanistic understanding of the phase separation and small molecule crystallization is needed to guide process optimization 18 .…”

Section: Introductionmentioning

confidence: 99%

Phase segregation mechanisms of small molecule‐polymer blends unraveled by varying polymer chain architecture

et al. 2021

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As phase separation between the small‐molecule semiconductor and the polymer binder is the key enabler of blend‐based organic field‐effect transistors (OFETs) fabricated by low‐cost solution processing, it is crucial to understand the underlying phase separation mechanisms that determine the phase morphology, which significantly impacts device performance. Beyond the parameter space investigated in previous work, here we investigate the formation of blends by varying the branch architecture of the polymer binder and by shortening the solvent dry time using ultrasonic spray casting. The phase morphologies of the resulting blend films have been thoroughly characterized with a variety of techniques in three dimensions over multiple length scales, including AFM, energy‐filtered transmission electron microscope, and neutron reflectivity, and have been correlated with electrical transport performance. From the results, we have inferred that the phase morphology is kinetically determined, limited by the inherent slow movement of polymer macromolecules. The kinetic picture, supported by molecular dynamics modeling, not only consistently explains our observations but also resolves inconsistencies in previous works. The achieved mechanistic understanding will guide further optimization of blend‐based organic electronics, such as OFETs and organic photovoltaics.

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Organic transistors based on airbrushed small molecule-insulating polymer blends with mobilities exceeding 1 cm² V⁻¹ s⁻¹

Abstract: High performance organic transistors have been realized via airbrush technique, using small molecule-insulating polymer blends.

Cited by 18 publications

References 32 publications

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

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

Organic Semiconductor/Insulator Blends for Elastic Field‐Effect Transistors and Sensors

Phase segregation mechanisms of small molecule‐polymer blends unraveled by varying polymer chain architecture

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