Impact of undercooling on epitaxially oriented liquid crystalline organizations of poly(3-hexylthiophene) below the eutectic temperature

Cheng, Wei-Chih; Yang, Chun Yen; Kang, Bo Yan; Kuo, Ming Yu; Ruan, Jrjeng

doi:10.1039/c3sm51726h

Cited by 8 publications

(14 citation statements)

References 47 publications

(48 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The system consisted of a longboard aluminum plate with a water circulation instituted for cooling. The eutectic temperature of the HMB/P3HT mixtures is approximately 180 °C, and the melting point of HMB is approximately 165 °C . Therefore, the plate was heated to 180 °C and controlled in the range of 150–180 °C by the water cooling system (Figure a).…”

Section: Methodsmentioning

confidence: 99%

“…The samples were moved under a constant speed from the 180 °C point to the 150 °C point (Figure a). As the samples reached the point below the 165 °C spot, the HMB began to separate from the HMB/P3HT mixtures and crystallize . After this process, the samples were placed in a vacuum for 1 day to completely remove HMB and form the H-P3HT samples.…”

Section: Methodsmentioning

confidence: 99%

“…After HMB was removed, modified microstructures of the insulating polymer films were obtained. Recently, we successfully adopted HMB to manipulate the molecular features and microstructural properties of semiconducting polymer films, including the changes in the crystalline forms of poly(9,9-di- n -octyl-2,7-fluorene) and in the molecular organizations of poly(3-hexylthiophene) (P3HT). , HMB is a suitable material for the microstructural modulation of organic semiconducting thin films at the molecular level. In this study, we used a technique that incorporates HMB into the thermal gradient system to fabricate P3HT-based OTFTs.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced and Anisotropic Charge Transport in Polymer-Based Thin-Film Transistors by Guiding Polymer Growth

Lü

Ruan

et al. 2016

Crystal Growth & Design

Self Cite

View full text Add to dashboard Cite

Ideal molecular features and microstructural properties of organic semiconducting thin films are being explored to achieve high-performance organic thin-film transistors (OTFTs). We prepared and processed hexamethylbenzene (HMB)/poly(3-hexylthiophene) (P3HT) mixtures using a thermal gradient system to fabricate P3HT-based OTFTs. In the thermal gradient system, the HMB separated from the HMB/ P3HT mixtures and crystallized along the sample movement direction. The crystallized HMB affected and guided the growth behavior of P3HT at the molecular level. Observations from joint microscopic and spectroscopic analyses revealed that the HMBprocessed P3HT (H-P3HT) thin film possessed anisotropic and improved microstructures, particularly in crystalline domains. The improved molecular features and microstructural properties of the H-P3HT thin film enhanced the intramolecular and intermolecular charge transport by extending the π-conjugation, decreasing the reorganization energy, and strengthening the π−π overlaps. The electrical performance of the H-P3HT OTFT was augmented significantly with respect to that of the spin-coated P3HT OTFT. In addition, the H-P3HT OTFT exhibited an anisotropic charge transport property, correlating with microstructure directionality and resulting from the difference in the directions of the π−π overlaps. This effective and simple technique can be applied to other device types and has the potential to achieve high-performance organic electronic/photonic devices.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced and Anisotropic Charge Transport in Polymer-Based Thin-Film Transistors by Guiding Polymer Growth

Lü

Ruan

et al. 2016

Crystal Growth & Design

Self Cite

View full text Add to dashboard Cite

show abstract

“…Upon solution casting, the composite crystalline powders were collected. The HMB melt is able to dissolve semi‐crystalline conjugated polymers, resulting in binary eutectic solutions . The melting of HMB crystals occurs above 167 °C, and at 180 °C the PBTTT‐Cn powders were dissolved by the melted HMB.…”

Section: Resultsmentioning

confidence: 99%

Successive stepwise evolution of host layer-stacking framework upon the intercalation of mobile vapor guests within side-chain layers

Yang

Wang

Zhang

et al. 2017

J. Polym. Sci. Part B: Polym. Phys.

Self Cite

View full text Add to dashboard Cite

For the ordered phases of hairy-rod semiconductive poly(2,5-bis(3-tetradecylthiophene-2-yl)thieno[3,2-b]thiophene) (PBTTT) sandwiched in between crystalline platelets of hexamethylbenzene, the successive stepwise evolution of layer-stacking framework upon guest intercalation has been studied in this research. The direct consequence of the guest intercalation into side-chain layers is evaluated to cause the lateral shift of thiophene backbones along p-p stacking, resulting in stepwise shift of ultraviolet absorption wavelength. The thermal motions of vapor guests within disordering side-chain layers subsequently cause progressive expansion of host stacking framework. With the increase in side-chain length, thicker layers of disordering side chains in liquid crystals (LCs) accommodate additional vapor guests and larger amplitudes of thermal motions of guests, hence promoting the level of reversible d-spacing change. The mixing between mobile vapor guests and aliphatic side chains is clarified as the mechanism of guest intercalation, which rationalizes successive guest intercalation during heating and the contribution of disordering side-chain layers.

show abstract

“…The crystalline platelets of hexamethylbenzene have been recognized able to efficiently grow below the melting temperature of 167°C, and guide the crystallization of conjugated polymers, like polythiophenes and polyfluorenes [29,30]. For the intensely studied fluorescent conjugated polyfluorene PFO, the HMB melt act as a good solvent, and homogeneous binary solutions of PFO and HMB can be achieved above 167°C through the whole range of composition.…”

mentioning

confidence: 99%

Oriented association of multiwall carbon nanotubes upon efficient epitaxial organization of polyfluorene

Tsai

Liu

et al. 2015

Carbon

Self Cite

View full text Add to dashboard Cite

Impact of undercooling on epitaxially oriented liquid crystalline organizations of poly(3-hexylthiophene) below the eutectic temperature

Cited by 8 publications

References 47 publications

Enhanced and Anisotropic Charge Transport in Polymer-Based Thin-Film Transistors by Guiding Polymer Growth

Enhanced and Anisotropic Charge Transport in Polymer-Based Thin-Film Transistors by Guiding Polymer Growth

Successive stepwise evolution of host layer-stacking framework upon the intercalation of mobile vapor guests within side-chain layers

Oriented association of multiwall carbon nanotubes upon efficient epitaxial organization of polyfluorene

Contact Info

Product

Resources

About