Solvent Effect on Morphology and Optical Properties 
of Poly(3-hexylthiophene):TIPS-Pentacene Blends

Ozório, Maíza da Silva; Camacho, Sabrina A.; Cordeiro, Neusmar J. A.; Duarte, José Leonil; Alves, Neri

doi:10.1007/s11664-017-5931-9

Cited by 8 publications

(6 citation statements)

References 52 publications

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“…This indicates that the addition of 2% P3HT doubled the average mobility of TIPS pentacene OTFTs. Specially, a hole mobility of up to 8.96 × 10 −2 cm 2 /Vs was demonstrated from the TIPS pentacene OTFTs with 2% P3HT additive, which was considerably higher than the mobility from 2 × 10 −3 cm 2 /Vs to 1.37 × 10 −2 cm 2 /Vs of spin-coated TIPS pentacene/P3HT blends film as reported in previous studies [37][38][39] . www.nature.com/scientificreports www.nature.com/scientificreports/ As compared to various insulation polymers, P3HT as a p-type conjugated polymer was reported to have hole mobilities ranging from 10 −5 cm 2 /Vs to 10 −4 cm 2 /Vs 40 , while pure TIPS pentacene has an average hole mobility of 0.03 ± 0.03 cm 2 /Vs 17 .…”

Section: Resultssupporting

confidence: 65%

Conjugated Polymer Controlled Morphology and Charge Transport of Small-Molecule Organic Semiconductors

Zhang

et al. 2020

Sci Rep

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In this study, we report an effective approach to tune the crystallization, microstructure and charge transport of solution-processed organic semiconductors by blending with a conjugated polymer additive poly(3-hexylthiophene) (P3HT). When 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) was used as a model semiconductor material to mix with different amount of P3HT, their intermolecular interactions led to distinctive TIPS pentacene film morphologies, including randomly-oriented crystal ribbons, elongated needles with enhanced long-range order, and grasslike curved microwires with interlinkages. Each type of morphology was found to further correlate to considerably different charge transport and device performance. As compared to pristine TIPS pentacene devices, bottom-gate, top-contact OTFTs with 2% in weight P3HT additive showed a 2-fold and 5-fold improvement of average field-effect mobility and performance consistency (defined as the ratio of average mobility to the standard deviation), respectively. The improvement in transistor electrical performance can be attributed to the combined effect of enhanced crystal orientation and uniformity, as well as increased areal coverage. This work can be applied beyond the particular example demonstrated in this study and to tune the charge transport of other small-molecule organic semiconductors in general. In recent years, the research of high-performance, solution-processed semiconductor based organic thin film transistors (OTFTs) has attracted great attention 1-6. In particular, substantial progress has been reported in the study of film morphology and charge transport of various small-molecule organic semiconductors, such as N,N'-1H,1H-perfluorobutyl dicyanoperylenecarboxydiimide (PDIF-CN 2) 7,8 , 6,13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene) 9,10 , and 5,11-bis(triethylgermylethynyl) anthradithiophene (diF-TEG-ADT) 11,12 , which enables the field-effect mobility to reach or even surpass that of amorphous silicon 13. Notwithstanding these advances, the fabrication of high-mobility organic semiconductor crystals typically requires the method of slow crystallization in solution, which inevitably results in randomly-oriented crystals 14,15 , and further leads to anisotropic charge transport and significant device-to-device performance variations of OTFTs 16. Various external alignment techniques, such as air flow navigation 17 , temperature gradient 18 and substrate tilting 19 , have been demonstrated to control the growth and align crystal orientation of small-molecule organic semiconductors. Besides, the approach of blending with polymer additives, which does not require the complex setup of external alignment techniques, has been reported as a simple and effective pathway to modulate the semiconductor crystallization, tune thin film morphology and enhance charge transport 20. For example, isotactic poly(methyl methacrylate) (i-PMMA) was blended with TIPS pentacene, and in conjunction with a vertical flow approach, the i-PMMA additive i...

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Section: Resultssupporting

confidence: 65%

Conjugated Polymer Controlled Morphology and Charge Transport of Small-Molecule Organic Semiconductors

Zhang

et al. 2020

Sci Rep

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“…Subsequently, Ozório et al [ 62 ] studied the solvent’s effects on the thin film morphology and the optical properties of the P3HT–TIPS-pentacene blend. Chloroform, toluene, and trichlorobenzene were used in their investigation by fabricating OFETs and using the P3HT–TIPS-pentacene blend as the active layer.…”

Section: Spin Coating Methodsmentioning

confidence: 99%

Review of the Common Deposition Methods of Thin-Film Pentacene, Its Derivatives, and Their Performance

et al. 2022

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Pentacene is a well-known conjugated organic molecule with high mobility and a sensitive photo response. It is widely used in electronic devices, such as in organic thin-film transistors (OTFTs), organic light-emitting diodes (OLEDs), photodetectors, and smart sensors. With the development of flexible and wearable electronics, the deposition of good-quality pentacene films in large-scale organic electronics at the industrial level has drawn more research attention. Several methods are used to deposit pentacene thin films. The thermal evaporation technique is the most frequently used method for depositing thin films, as it has low contamination rates and a well-controlled deposition rate. Solution-processable methods such as spin coating, dip coating, and inkjet printing have also been widely studied because they enable large-scale deposition and low-cost fabrication of devices. This review summarizes the deposition principles and control parameters of each deposition method for pentacene and its derivatives. Each method is discussed in terms of experimentation and theory. Based on film quality and device performance, the review also provides a comparison of each method to provide recommendations for specific device applications.

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“…Ozόrio et al. [ 104 ] investigated the morphological feature of TIPS‐pentacene/P3HT blend films by using chloroform, toluene, or TCB as the solvent. TIPS‐pentacene/P3HT blend film prepared using TCB showed the best morphology with moderate phase segregation and better P3HT ordering, and the field‐effect mobility was three times larger than that with the other two solvents.…”

Section: Optimization Strategy Of Vps Structurementioning

confidence: 99%

“…The slower rate of solvent loss provided more time for the migration of TIPSpentacene molecule, which promoted phase separation in a relatively flowing (solvent-rich, low-viscosity) film. Ozόrio et al [104] investigated the morphological feature of TIPS-pentacene/ P3HT blend films by using chloroform, toluene, or TCB as the solvent. TIPS-pentacene/P3HT blend film prepared using TCB showed the best morphology with moderate phase segregation and better P3HT ordering, and the field-effect mobility was three times larger than that with the other two solvents.…”

Section: Solventmentioning

confidence: 99%

Vertical Phase Separation Structure for High‐Performance Organic Thin‐Film Transistors: Mechanism, Optimization Strategy, and Large‐Area Fabrication toward Flexible and Stretchable Electronics

Yin

Yang

Wang

2022

Adv Funct Materials

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Organic thin-film transistors (OTFTs) exhibit great potential applications in flexible logic circuits, sensors, nonvolatile memory, etc. The vertical phase separation (VPS) structure, deriving from the blends of small molecules and polymers, can produce a high-quality crystalline semiconducting layer and an intrinsic and trap-free semiconductor/insulator interface. OTFTs with a VPS structure provide a promising route to accelerate their commercialization due to these desirable features including excellent device performance, good uniformity and reproducibility, environmental and mechanical stability, lowcost and large-area fabrication. Additionally, VPS OTFTs also exhibit a good balance between electronical properties and stretchability for intrinsic stretchable OTFTs. Herein, a comprehensive review is given on VPS structure for flexible and stretchable OTFTs. First, the evolution history of VPS structures and its formation mechanism are summarized. Based on the understanding of the VPS structure, the optimization strategies of VPS structures for highperformance OTFTs are presented. Subsequently, the large-area fabrication techniques of VPS structures, as well as the potential applications in flexible and stretchable OTFTs, are discussed. Finally, conclusions and outlook are provided for the further development of VPS structure in OTFTs. This review would promote the understanding and development of VPS structures in OTFTs, accelerating its applications in flexible and stretchable electronics.

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Solvent Effect on Morphology and Optical Properties of Poly(3-hexylthiophene):TIPS-Pentacene Blends

Cited by 8 publications

References 52 publications

Conjugated Polymer Controlled Morphology and Charge Transport of Small-Molecule Organic Semiconductors

Conjugated Polymer Controlled Morphology and Charge Transport of Small-Molecule Organic Semiconductors

Review of the Common Deposition Methods of Thin-Film Pentacene, Its Derivatives, and Their Performance

Vertical Phase Separation Structure for High‐Performance Organic Thin‐Film Transistors: Mechanism, Optimization Strategy, and Large‐Area Fabrication toward Flexible and Stretchable Electronics

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