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

Asare‐Yeboah, Kyeiwaa; Frazier, R. M.; Szulczewski, Greg; Li, Dawen

doi:10.1116/1.4893438

Cited by 25 publications

(10 citation statements)

References 26 publications

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“…Various efforts have been made to address these issues in different semiconducting material systems. [10][11][12] For example, Lee et al demonstrated the growth of 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS pentacene) on a slightly tilted substrate, resulting in an array of ribbon-shaped TIPS pentacene crystals well-aligned in the tilted direction of the substrate. 13 More recently, Li et al employed a "droplet-pinned crystallization" method to control the crystal growth of C 60 , which successfully leads to well-aligned C 60 single crystals.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…The higher mobility on ITO/PET flexible substrate is attributed to the hydrophobic nature of PVP-PMF dielectric surface, which promotes the adhesion of silyl group from TIPS pentacene and molecular stacking [28]. Compared with an average mobility of 0.06 ± 0.05 cm 2 /Vs from pure TIPS pentacene via temperature gradient method only, the mobility increased from the order of magnitude of 10 -2 cm 2 /Vs [17] to about 10 -1 cm 2 /Vs for the TIPS pentacene/PαMS blend based OTFTs in this work. The increase in mobility is mainly attributed to the improvement of crystal orientation and elimination of the thermal cracks.…”

Section: Resultsmentioning

confidence: 97%

“…The TIPS pentacene crystal growth commences from the lower temperature region towards the higher temperature region when the solution reaches supersaturation, as shown in Figures 1(a-c Figures 2(a-c) show the morphologies of pure TIPS pentacene films with the application of the temperature gradient technique. Employing a temperature gradient overcomes the random orientation of crystals and poor areal coverage as compared to those films from simple drop casting [12,17,25]; however, temperature gradient method also causes the development of undesired thermal cracks in the film as observed in these images. Figures 2(d-f) show the morphologies of the TIPS pentacene films with the addition of PαMS polymer, in which no thermal cracks are generated.…”

Section: Introductionmentioning

confidence: 97%

“…Nevertheless, maintaining device-to-device performance uniformity of these small-molecule based OTFTs still remains a challenge [13,14] because of the non-uniform crystal orientation in the active layer [15,16]. Recently, we developed a simple yet unique solution processing method, the temperature gradient technique, to control crystal growth of pure TIPS pentacene semiconductor [17]. With such an approach, the intrinsic crystal misalignment is reduced, and the resulting film exhibits large crystal sizes and substantial areal coverage.…”

Section: Introductionmentioning

confidence: 99%

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Temperature gradient controlled crystal growth from TIPS pentacene-poly(α-methyl styrene) blends for improving performance of organic thin film transistors

Asare‐Yeboah

et al. 2016

Organic Electronics

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6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) from simple drop casting typically forms crystals with random orientation and poor areal coverage, which leads to device-to-device performance variation of organic thin film transistors (OTFTs). Previously, a temperature gradient technique was developed to address these problems. However, this approach simultaneously introduced thermal cracks due to the thermally induced stress during crystallization. These thermal cracks accounted for a reduction of charge transport, thereby impacting the device performance of TIPS pentacene based OTFTs. In this work, an insulating polymer, poly(α-methyl styrene) (PαMS) was blended with TIPS pentacene to relieve the thermal stress and effectively prevent the generation of thermal cracks. The results demonstrate that the incorporation of PαMS polymer combined with the temperature gradient technique improves both the hole mobility and performance consistency of TIPS pentacene based OTFTs.

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“…Despite these advantages, their implementation in organic electronics devices still has many restrictions, which can be attributed to problems including crystal misorientation, morphological nonuniformity and low charge-carrier mobility [12,13]. These issues would further cause problems such as substrate poor coverage and inferior device performance consistency [14][15][16][17]. As a result, various hybrid material systems that incorporate both organic semiconductors and additive materials have been successfully demonstrated, which can take advantages of the merits from both components and contribute to the enhanced performance of organic electronics devices [18][19][20].…”

Section: Introductionsmentioning

confidence: 99%

Nanoparticles for organic electronics applications

Zhang

2020

Mater. Res. Express

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Recently, the research in solution-based, small-molecule organic semiconductors has achieved great progress, although their application in organic electronics devices is still restricted by a variety of issues, including crystal misorientation, morphological nonuniformity and low charge-carrier mobility. In order to overcome these issues, hybrid material systems that incorporate both organic semiconductors and additives have been successfully demonstrated to control crystal growth and charge transport of the organic semiconductors. In this work, we first review the recent advances in the charge-carrier mobility of the organic semiconductors, followed by a comparison of the different additives that have been reportedly blended with the semiconductors, including polymeric additives, small-molecule additives and nanoparticle based additives. Then we will review the important nanoparticles employed as additives to blend with solution-based, organic semiconductors, which effectively improved the semiconductor crystallization, enhanced film uniformity and increased charge transport. By discussing specific examples of various well-known organic semiconductors such as 6, 13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene), we demonstrate the essential relationship among the crystal growth, semiconductor morphology, dielectric properties, and chargecarrier mobilities. This work sheds light on the implementation of nanoparticle additives in highperformance organic electronics device application. the application of the organic semiconductor in thin-film transistor and other electronics device fabrication. Throughout the discussion of these specific examples that mainly involve small-molecule organic semiconductors, we showcase that this work can be used to control the crystallization and electrical performance of other newly-discovered, high-performance, semiconducting materials. Advances in organic electronicsIn this section, we will review the various advances in charge-carrier mobilities and device application that have been recently achieved in the field of organic electronics. The following discussion will be mainly focused on various solution-processed, small-molecule, organic semiconductors.The mobilities in solution-processed, small-molecule, organic semiconductors have been reported to be compared to or even far surpass the mobility of amorphous silicon. For example, Asare-Yeboah et al developed a temperature-based method which exposed the substrate to a gradient temperature and induced a solubility difference of a p-type small-molecule semiconductor 6, 13-bis (triisopropylsilylethynyl) pentacene (TIPS pentacene) [18]. TIPS pentacene crystals grew from the lower temperature side of the substrate towards the higher temperature side, forming well-aligned ribbons across the whole substrate. A mobility of up to 0.5 cm 2 V −1 s −1 has been reported from the TIPS pentacene OTFTs based on an ITO/PET flexible substrate by using the temperature-based alignment technique. Wade et al demonstrated a zone casting metho...

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

Abstract: Articles you may be interested inInterfacial nucleation behavior of inkjet-printed 6,13 bis(tri-isopropylsilylethynyl) pentacene on dielectric surfaces

Cited by 25 publications

References 26 publications

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

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

Temperature gradient controlled crystal growth from TIPS pentacene-poly(α-methyl styrene) blends for improving performance of organic thin film transistors

Nanoparticles for organic electronics applications

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