scholarly journals Controlled Self-Assembly of Conjugated Polymers via a Solvent Vapor Pre-Treatment for Use in Organic Field-Effect Transistors

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 332 ◽  
Author(s):  
Gyounglyul Jo ◽  
Jaehan Jung ◽  
Mincheol Chang
Keyword(s):  
Conjugated Polymers ◽  
Self Assembly ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Grazing Incidence ◽  
Charge Carrier Mobility ◽  
Molecular Assembly ◽  
Solvent Vapor ◽  
Precise Control ◽  
Vis Spectroscopy

A facile solution-processing strategy toward well-ordered one-dimensional nanostructures of conjugated polymers via a non-solvent vapor treatment was demonstrated, which resulted in enhancements to the charge transport characteristics of the polymers. The amount of crystalline poly(3-hexylthiophene) (P3HT) nanofibers was precisely controlled by simply varying the exposure time of solutions of P3HT solutions to non-solvent vapor. The effects of non-solvent vapor exposure on the molecular ordering and morphologies of the resultant P3HT films were systematically investigated using ultraviolet-visible (UV-vis) spectroscopy, polarized optical microscopy (POM), grazing incidence X-ray diffraction (GIXRD), and atomic force microscopy (AFM). The non-solvent vapor facilitates the π–π stacking in P3HT to minimize unfavorable interactions between the poor solvent molecules and P3HT chains. P3HT films deposited from the non-solvent vapor-treated P3HT solutions exhibited an approximately 5.6-fold improvement in charge carrier mobility as compared to that of pristine P3HT films (7.8 × 10−2 cm2 V−1 s−1 vs. 1.4 × 10−2 cm2 V−1 s−1). The robust and facile strategy presented herein would be applicable in various opto-electronics applications requiring precise control of the molecular assembly, such as organic photovoltaic cells, field-effect transistors, light-emitting diodes, and sensors.

Controlled self-assembly of polymer semiconductors in solution using a solvent-vapor approach

2019 ◽  
Vol 33 (14n15) ◽  
pp. 1940038
Author(s):  
Gyounglyul Jo ◽  
Solip Choi ◽  
Jae Won Jeong ◽  
Gyun Taek Lim ◽  
Jaehan Jung ◽  
...  
Keyword(s):  
Self Assembly ◽  
Solution Treatment ◽  
Molecular Assembly ◽  
Solvent Vapor ◽  
Force Microscopy ◽  
Polymer Semiconductors ◽  
Molecular Ordering ◽  
Vis Spectroscopy ◽  
Self Assembled ◽  
Solvent Molecules

A facile solution treatment strategy for controlling the microstructure of conjugated polymers using a non-solvent vapor is introduced. The content of well-ordered poly(3-hexylthiophene) (P3HT) aggregates in solution was precisely controlled by varying the non-solvent vapor exposure time. P3HT chains were self-assembled upon exposure to the non-solvent vapor to minimize the unfavorable interactions with the non-solvent molecules. The effect of solvent vapor on the molecular ordering and morphologies of P3HT films was investigated by UV-Vis spectroscopy, atomic force microscopy, and polarized optical microscopy. These studies reveal that the self-assembled P3HT aggregates have well-ordered nanofibrillar structures formed via [Formula: see text]–[Formula: see text] stacking. This strategy paves the way toward fabricating well-ordered polymeric structures, especially in the field of opto-electronic applications including FETs, LEDs, and lasers, where proper alignment or molecular assembly is in great demand.

Biaxially extended thiophene–isoindigo donor–acceptor conjugated polymers for high-performance flexible field-effect transistors

2016 ◽  
Vol 7 (26) ◽  
pp. 4378-4392 ◽  
Author(s):  
Hung-Chin Wu ◽  
Chian-Wen Hong ◽  
Wen-Chang Chen
Keyword(s):  
Electrical Properties ◽  
Conjugated Polymers ◽  
Field Effect ◽  
High Performance ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Charge Carrier Mobility ◽  
Ambient Atmosphere ◽  
Donor Acceptor ◽  
A Charge

Biaxially-extended thiophene–isoindigo donor–acceptor conjugated polymers were explored for high-performance flexible field-effect transistors. A charge carrier mobility of 1.0 cm2 V−1 s−1 was achieved under ambient atmosphere with stable electrical properties.

ENHANCED-MOBILITY ORGANIC FIELD-EFFECT TRANSISTORS FABRICATED UNDER SOLVENT VAPOR ATMOSPHERE

NANO ◽  
2014 ◽  
Vol 09 (04) ◽  
pp. 1450049
Author(s):  
HAIYANG GUI ◽  
ZONGPENG ZHU ◽  
BIN WEI ◽  
JUN WANG
Keyword(s):  
Self Assembly ◽  
Field Effect ◽  
Field Effect Transistors ◽  
Electrical Performance ◽  
Organic Field Effect Transistors ◽  
Solvent Vapor ◽  
One Dimensional ◽  
Enhanced Mobility ◽  
Π Stacking Interaction ◽  
The Difference

Solvent vapor atmosphere is introduced for solution-evaporated poly(3-hexylthiophene) (P3HT) formation in fabricating organic field-effect transistors (OFETs). As changing the solvent vapor atmosphere, prominent influences on the assemblies of P3HT nanowires during solidification were represented, leading to the difference in nanostructure morphologies. We demonstrated that the device fabricated under anisole solvent vapor atmosphere is superior in electrical performance to that of the devices fabricated under other conditions. In this process, anisole solvent vapor atmosphere transparently facilitated one-dimensional (1D) self-assembly through π–π stacking interaction among the P3HT units during solidification.

Synthesis, Self-Assembly and Solution-Processed Field-Effect Transistors of a Liquid Crystalline Bis(dithienothiophene) Derivative

2009 ◽  
Vol 113 (36) ◽  
pp. 16232-16237 ◽  
Author(s):  
Shiming Zhang ◽  
Yunlong Guo ◽  
Ling Wang ◽  
Qikai Li ◽  
Kai Zheng ◽  
...  
Keyword(s):  
Self Assembly ◽  
Field Effect ◽  
Liquid Crystalline ◽  
Field Effect Transistors ◽  
Solution Processed

scholarly journals Orientation analysis of pentacene molecules in organic field-effect transistor devices using polarization-dependent Raman spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Bishwajeet Singh Bhardwaj ◽  
Takeshi Sugiyama ◽  
Naoko Namba ◽  
Takayuki Umakoshi ◽  
Takafumi Uemura ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Charge Carrier ◽  
Molecular Orientation ◽  
Field Effect ◽  
High Performance ◽  
Carrier Mobility ◽  
Field Effect Transistors ◽  
Charge Carrier Mobility ◽  
Orientation Distribution ◽  
High Resolution Technique

Abstract Pentacene, an organic molecule, is a promising material for high-performance field effect transistors due to its high charge carrier mobility in comparison to usual semiconductors. However, the charge carrier mobility is strongly dependent on the molecular orientation of pentacene in the active layer of the device, which is hard to investigate using standard techniques in a real device. Raman scattering, on the other hand, is a high-resolution technique that is sensitive to the molecular orientation. In this work, we investigated the orientation distribution of pentacene molecules in actual transistor devices by polarization-dependent Raman spectroscopy and correlated these results with the performance of the device. This study can be utilized to understand the distribution of molecular orientation of pentacene in various electronic devices and thus would help in further improving their performances.

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