Solvent Effect on the Electrical Properties of Triisopropylsilylethynyl (TIPS) Pentacene Organic Thin-Film Transistors

Choi, Kwang Nam; Kim, Kyung Seok; Chung, Kwansoo; Lee, Hosun

doi:10.1109/tdmr.2009.2027227

Cited by 30 publications

(3 citation statements)

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“…Large-area organic thin films can be fabricated at low cost and high throughput using solution deposition. ,,− However, solution processing methods are limited in terms of precisely controlling the thin film morphology during the solution deposition. ,,,,− Cho et al reported that blending TIPS pentacene with amorphous (triarylamine-based) polymers improved the orientation of TIPS pentacene thin films . Consequently, the polymer structure induced moderate separation between the two phases, resulting in a dominant layer with highly oriented crystalline structures.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of the Interaction between the Substrate Surface and Organic Molecules for the Formation of Highly Oriented Organic Thin Films

Okuda,

Yoshida

2024

J. Phys. Chem. C

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The orientation of organic molecules is a key factor in improving the electrical performance of organic thin films. The interaction between the substrate surface and organic molecules dissolved in the solvent influences the orientation of the thin film during wet deposition. This study proposes a novel and simple evaluation criterion using the contact angle to directly and quantitatively observe the aforementioned interaction. SiO 2 substrates were treated using four common cleaning methods: organic solvent cleaning, piranha cleaning, UV/O 3 cleaning, and UV/O 3 with organic solvent cleaning. The aforementioned interaction was assessed by varying the contact angle of toluene in the presence and absence of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS pentacene). The orientation of TIPS pentacene thin films formed on various SiO 2 substrates by spin coating was investigated by using out-of-plane and in-plane X-ray diffraction. The field-effect mobility of top-contact organic thin-film transistors (OTFTs) fabricated using these thin films was evaluated. Independent of the surface states of the prepared SiO 2 substrates, TIPS pentacene thin films exhibited a horizontal orientation, as perpendicular alignment was notably influenced by the surface states. The strong affinity between the substrate surfaces and organic molecules favored the formation of perpendicular oriented thin films, whereas repulsive interactions led to nonoriented perpendicular thin films. This affinity can be gauged by the difference in the contact angle between the solvent with and without organic molecules, contributing to the development of highly oriented organic thin films. Furthermore, the affinity between the substrate surface and organic semiconductor molecules enhanced the orientation of thin films and the performance of OTFTs.

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Section: Introductionmentioning

confidence: 99%

Direct Observation of the Interaction between the Substrate Surface and Organic Molecules for the Formation of Highly Oriented Organic Thin Films

Okuda,

Yoshida

2024

J. Phys. Chem. C

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“…Inducing crystal formation in semiconductors is desirable for increasing the regioregularity-and therefore charge carrier mobility-in the OFET. Choi et al demonstrated that for a 1 wt% TIPS-pentacene solution the final charge mobility increases with the boiling point of the solvent, with chlorobenzene (boiling point 131.72°C) producing a final charge mobility of 0.01 cm 2 / V•s, and chloroform (boiling point 61.17°C) with a charge mobility of 5.8x10 -7 cm 2 / V•s [65]. The higher boiling point results in slower evaporation of the organic solvent allowing larger crystals to form.…”

Section: Attributes Of Organic Semiconductorsmentioning

confidence: 99%

“…Initial observations of the screen printed TIPS-pentacene (Figure 86a) show very small spherulite crustal structures (5 -40 µm), and a very light colour, particularly compared to the spin deposited structures (Figure 86b). The reason for this is likely the rate of evaporation, and the volumes present [65],…”

Section: Macroscale Observationsmentioning

confidence: 99%

Next Generation Non-Invasive Biomarker Testing in Saliva: The Organic Electrolyte Gated Field Effect Transistor Aptasensor System

Massey

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Diagnostic biomolecule quantification in healthcare relies on effective but centralized laboratory testing procedures. However, as the need for testing rapidly grows, the current process is struggling to meet the demand. Rapid point-of-contact analysis devices are not capable of non-invasive quantification of small, dilute molecules such as steroid hormones in saliva. Current literature bioquantification devices suffer from drawbacks such as short shelf life, high intra-device variability, sample matrix effects, material incompatibilities, high-cost fabrication and data collection that rely on laboratory conditions and processes. This body of work took our organic electrolyte gated field effect transistor (OEGFET), a novel biosensor architecture, and developed it into a feasible platform for real-world biomolecule quantification applications.1-iv | P a g e For all of the papers presented in this work I was listed as the primary author as I contributed to study conception and design, device fabrication, device testing, analysis and interpretation of results, and manuscript draft preparation. My supervisor Prof. R. Prakash contributed to study conception and design, result interpretation, and manuscript preparation for all papers.Additional Contributions: J1. Dr. S. Bebe fabricated the top gate surfaces and helped with editing the manuscript draft. J2. Dr. R. Amache developed the bio-gel fabrication process, fabricated the bio-gel EDLC capacitors and helped with manuscript editing. Dr. S. Bebe also helped with manuscript preparation and fabricated the device top gates. J3. I also redesigned the OEGFET devices into a flexible format including establishing an APTES immobilization process that would be suitable for Kapton and safe to perform in our cleanroom. J4. I also optimized the new models and designed their parameter extraction processes. J5. I also redesigned the APTES process to prevent delamination. Prof. R. Prakash also acquired ethics board approval for the collection and testing of human saliva. J6. B. Gamero and I decided on the current shunt method of data collection for the OEGFET, and I wrote the software for the OEGFET data collection with the board. B. Gamero designed the footprint, EIS collection method, and external circuitry of the printed circuit board. J7. We used the same board developed by B. Gamero from J6. J8. We used the same board developed by B. Gamero from J6. J9. I designed the PVA-Carrageenan cross linking on surface process based on the bulk crosslinking work of Dr. R. Amache, transistor device testing, analysis and interpretation of results, and manuscript draft preparation. X. Song performed capacitor fabrication, capacitor data collection and analysis, and contributed to manuscript preparation. J10. Dr. E. McConnell and Prof. M. DeRosa of the Ladder group at Carleton designed and produced the αSyn aptamer and contributed to manuscript preparation. D. Chan and Prof. M. Holahan performed the fluorescence quantification and contributed to manuscript preparation. Additional contributio...

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1D versus 2D Growth of Soluble Acene Crystals from Soluble Acene/Polymer Blends Governed by a Residual Solvent Reservoir in a Phase‐Separated Polymer Matrix

Lee

Choi

Park

et al. 2018

Adv Funct Materials

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The growth mechanism of soluble acene is highly dependent on the remaining residual solvent following solution processing. The relationship between the amount of residual solvent and the growth modes of a prototypical soluble acene, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPSpentacene) are examined under spin casting TIPS-pentacene/insulating polymer blends. Changing spin time of the blend solution allows to control the amount of residual solvent, which significantly determines the growth modes of TIPS-pentacene vertically segregated onto the insulating polymer. In situ observation of crystal growth reveals that excess residual solvent in short spin time induces a convective flow in a drying droplet, thereby resulting in 1D growth of TIPS-pentacene crystals. On the other hand, optimal amount of residual solvent in a moderate spin time results in 2D growth of TIPS-pentacene crystals. The well-developed 2D spherulites allow for higher field-effect mobility than that of the 1D crystals because of the higher perfectness and coverage of TIPS-pentacene crystals. The use of other types of soluble acene and insulating polymer only changes the kinetics of crystallization, while the transition of growth mode from 1D to 2D is still observed. This general growth mechanism facilitates the understanding of crystallization behavior of soluble acene for the development of high-performance organic transistors.

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Solvent Effect on the Electrical Properties of Triisopropylsilylethynyl (TIPS) Pentacene Organic Thin-Film Transistors

Cited by 30 publications

References 18 publications

Direct Observation of the Interaction between the Substrate Surface and Organic Molecules for the Formation of Highly Oriented Organic Thin Films

Direct Observation of the Interaction between the Substrate Surface and Organic Molecules for the Formation of Highly Oriented Organic Thin Films

Next Generation Non-Invasive Biomarker Testing in Saliva: The Organic Electrolyte Gated Field Effect Transistor Aptasensor System

1D versus 2D Growth of Soluble Acene Crystals from Soluble Acene/Polymer Blends Governed by a Residual Solvent Reservoir in a Phase‐Separated Polymer Matrix

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