Air-flow navigated crystal growth for TIPS pentacene-based organic thin-film transistors

He, Zhengran; Chen, Jihua; Sun, Zheng; Szulczewski, Greg; Li, Dawen

doi:10.1016/j.orgel.2012.05.044

Cited by 60 publications

(36 citation statements)

References 27 publications

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“…3(b). While the pristine TIPS pentacene film exhibited a large grain width of 91 ± 20 µm as previously reported 17 , the grain width changed to 17.2 ± 6.92 µm, 8.35 ± 2.39 µm, 4.75 ± 0.93 µm, and 9.41 ± 1.87 µm, at the P3HT loading ratio of 2%, 10%, 25% and 50%, respectively, as shown in Fig. 3(b).…”

Section: Resultssupporting

confidence: 82%

“…In order to tune the TIPS pentacene morphology, conjugated polymer additive P3HT was blended with TIPS pentacene at different weigh ratios, including 2%, 10%, 25% and 50%, respectively. The pristine TIPS pentacene formed randomly oriented crystals when grown via the method of drop casting, which resulted in anisotropic charge transport and significant device-to-device performance inconsistency of TIPS pentacene based OTFTs 17 . The microscopic optical image of pristine TIPS pentacene film is shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

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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: 82%

Section: Resultsmentioning

confidence: 99%

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

Zhang

et al. 2020

Sci Rep

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“…9 He et al used external air flow to navigate the TIPS pentacene crystal growth and obtained a thin film with uniform crystal orientation and reduced gaps. 10 However, by using the temperature gradient, we were able to achieve TIPS pentacene crystal films with larger individual crystal sizes (measured along the crystal short axis), more extensive areal coverage, and more uniform crystal orientation compared to previous studies.…”

Section: Introductionmentioning

confidence: 72%

Temperature gradient approach to grow large, preferentially oriented 6,13-bis(triisopropylsilylethynyl) pentacene crystals for organic thin film transistors

Asare‐Yeboah

Frazier

Szulczewski

et al. 2014

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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“…In both cases of crystal growth in single and double solvents, however, there is no uniform crystal orientation, which could cause significant device performance variation if such films are used as the active layer of OTFTs. 33,34 In order to address these issues, we applied the CESA method combined with the double solvent system to effectively control the crystallization, and obtained SMDPPEH crystalline films with enhanced crystal alignment and areal coverage.…”

Section: Resultsmentioning

confidence: 99%

Solution-grown small-molecule organic semiconductor with enhanced crystal alignment and areal coverage for organic thin film transistors

Chen

et al. 2015

AIP Advances

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Drop casting of small-molecule organic semiconductors typically forms crystals with random orientation and poor areal coverage, which leads to significant performance variations of organic thin-film transistors (OTFTs). In this study, we utilize the controlled evaporative self-assembly (CESA) method combined with binary solvent system to control the crystal growth. A small-molecule organic semiconductor,2,5-Di-(2-ethylhexyl)-3,6-bis(5″-n-hexyl-2,2′,5′,2″]terthiophen-5-yl)-pyrrolo[3,4-c]pyrrole-1,4-dione (SMDPPEH), is used as an example to demonstrate the effectiveness of our approach. By optimizing the double solvent ratios, well-aligned SMDPPEH crystals with significantly improved areal coverage were achieved. As a result, the SMDPPEH based OTFTs exhibit a mobility of 1.6 × 10−2 cm2/V s, which is the highest mobility from SMDPPEH ever reported.

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Air-flow navigated crystal growth for TIPS pentacene-based organic thin-film transistors

Cited by 60 publications

References 27 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

Temperature gradient approach to grow large, preferentially oriented 6,13-bis(triisopropylsilylethynyl) pentacene crystals for organic thin film transistors

Solution-grown small-molecule organic semiconductor with enhanced crystal alignment and areal coverage for organic thin film transistors

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