scholarly journals A Quinacridone-Diphenylquinoxaline-Based Copolymer for Organic Field-Effect Transistors

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 563 ◽  
Author(s):  
Yong Jeong ◽  
Jeong Oh ◽  
Ho Song ◽  
Tae An
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Coupling Reaction ◽  
Hole Mobility ◽  
Organic Field Effect Transistors ◽  
Field Effect Mobility ◽  
X Ray Diffraction ◽  
Suzuki Coupling Reaction ◽  
X Ray ◽  
Heat Treated

In this work, we characterized poly(quinacridone-diphenylquinoxaline) (PQCTQx). PQCTQx was synthesized by a Suzuki coupling reaction and the synthesized PQCTQx was used as a polymeric semiconducting material in organic field-effect transistors (OFETs) to research the potential of using quinacridone derivatives. The measured field-effect mobility of the pristine PQCTQx film was 6.1 × 10−3 cm2/(V·s). A PQCTQx film heat-treated at 150 °C exhibited good field-effect performances with a hole mobility of 1.2 × 10−2 cm2/(V·s). The improved OFET behaviors resulting from the mild thermal treatment was attributed to improved packing of the molecules in the film, as determined using X-ray diffraction, and to decreased channel resistance.

Preparation, Characterization, and FET Properties of 3,3',5,5'-Tetra-Phenyldiphenoquinone

2019 ◽  
Vol 288 ◽  
pp. 44-50
Author(s):  
Xiao Ying Zhang ◽  
Altan Bolag ◽  
Yun Wu ◽  
Yoshiro Yamashita
Keyword(s):  
Field Effect Transistors ◽  
Hole Mobility ◽  
Crystal Structure Analysis ◽  
Organic Field Effect Transistors ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Contact Configuration ◽  
Single Crystal Structure Analysis

In this work, tetraphenyldiphenoquinone (DPQ) was synthesized and characterized by single crystal structure analysis, ultraviolet–visible spectroscopy (UV–Vis) and cyclic voltammetry (CV). DPQ–based organic field-effect transistors (OFET) were fabricated with bottom contact configuration using bare SiO2/Si substrate and hexamethyldisilazane (HMDS) treated substrate, respectively. The HMDS-treated device showed hole mobility of 8.7 × 10−7 cm2 V−1 s−1, current on/off ratio of 1.2 × 102 and threshold voltage of −39 V. Devices with bare substrate showed no FET behaviors. Finally, film morphology was investigated by X-ray diffraction (XRD) analyses and the results showed that the HMDS treatment exhibits better crystallinity of DPQ on the film thus obtaining FET performance.

Morphology and Field-Effect Mobility Characterization of Planar Five-Ring-Fused Dithiophene-Dione

2013 ◽  
Vol 331 ◽  
pp. 452-455 ◽  
Author(s):  
Jing Wang
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Layer By Layer ◽  
Organic Field Effect Transistors ◽  
Field Effect Mobility ◽  
X Ray Diffraction ◽  
Vapor Growth ◽  
Face To Face ◽  
Atomic Force ◽  
Substrate Temperatures

The thin films of compound 2,7-dihexyl-4,9-dihydro-s-indaceno [1,2-b:5,6-b']- dithiophene-4,9-dione were grown by physical vapor growth at different substrate temperatures. The morphology of surfaces was characterized by atomic force microscope and X-ray diffraction, which exhibits increased crystal grain size and film order with the increase of substrate temperature. The molecule exhibits layer-by-layer packing on the Si/SiO2 substrate and the tilt angle with respect to the substrate is 49.5°, which form extended slipped face-to-face π-stacking in each layer. This result indicates that molecular packing in the thin film is similar to that in the single crystal. The organic field-effect transistors (OFETs) incorporating this compound shows a field effect mobility at the order of 10-3 cm2V-1s-1 and an on-off ratio of 4 × 106 with good air-stability.

scholarly journals Modeling of Grazing-Incidence X-ray Diffraction from Naphthyl End-Capped Oligothiophenes in Organic Field-Effect Transistors

2020 ◽  
Vol 20 (6) ◽  
pp. 3968-3978
Author(s):  
Michael J. Winokur ◽  
Mathias K. Huss-Hansen ◽  
Andreas E. Lauritzen ◽  
Mika Torkkeli ◽  
Jakob Kjelstrup-Hansen ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Grazing Incidence ◽  
Organic Field Effect Transistors ◽  
X Ray Diffraction ◽  
X Ray

Organic Field-Effect Transistors Based on 3’-Flouro-2,2',6,6'-Tetraphenyl-4,4'-Dipyranylidene

2019 ◽  
Vol 288 ◽  
pp. 37-43
Author(s):  
Altan Bolag ◽  
Yoshiro Yamashita
Keyword(s):  
Field Effect ◽  
Density Functional ◽  
Field Effect Transistors ◽  
Organic Field Effect Transistors ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
Visible Spectroscopy ◽  
Functional Theory ◽  
X Ray ◽  
Contact Configuration

In this work, 3’-flouro-2,2',6,6'-tetraphenyl-4,4'-dipyranylidene (3FDP) was originally synthesized and investigated with density functional theory (DFT) calculations, ultraviolet–visible spectroscopy (UV–Vis) and cyclic voltammetry (CV) in comparison with 2,2',6,6'-tetraphenyl-4,4'-dipyranylidene (DP) and 4’-flouro-2,2',6,6'-tetraphenyl-4,4'-dipyranylidene (4FDP). 3FDP-based organic field-effect transistors (OFETs) were fabricated with bottom contact configuration on bare SiO2/Si substrate, 1,1,1,3,3,3-hexamethyldisilazane (HMDS) and octadecyltrichlorosilane (OTS) treated substrate, respectively. The HMDS-treated device showed highest mobility of 4 × 10−4 cm2 V−1 s−1, on/off ratio of 4 × 103 and threshold voltage of −10 V. Finally, vacuum deposited 3FDP films morphology was investigated by X-ray diffraction (XRD) analyses and the results showed higher crystallinity of HMDS-treated 3FDP film compared to the OTS-treated film, leading to a better FET performance.

scholarly journals Thienothiophene-benzotriazole-based semicrystalline linear copolymers for organic field effect transistors

2014 ◽  
Vol 86 (8) ◽  
pp. 1293-1302 ◽  
Author(s):  
Seungjib Yum ◽  
Tae Kyu An ◽  
Xiaowei Wang ◽  
Mohammad Afsar Uddin ◽  
Thanh Luan Nguyen ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistors ◽  
Hole Mobility ◽  
Organic Field Effect Transistors ◽  
X Ray Diffraction ◽  
Chain Packing ◽  
Coulombic Interactions ◽  
Out Of Plane ◽  
Plane Direction ◽  
Diffraction Patterns

AbstractA series of thienothiophene-benzotriazole-based semicrystalline copolymers, PTTBTz, PTTBTz-F, and PTTBTz-OR, were synthesized by considering chain linearity, planarity and inter-chain packing by virtue of non-covalent attractive interaction. Fluorine and alkoxy substituents were introduced to modulate the intra- and inter-chain coulombic interactions and crystalline ordering. The fluorine and alkoxy-substituted PTTBTz-F and PTTBTz-OR showed pronounced inter-chain packing with edge-on orientation confirmed by UV-vis absorption and X-ray diffraction measurements. The well-resolved diffraction patterns were obtained for PTTBTz-F and PTTBTz-OR, showing (100)∼(500) inter-lamellar scattering peaks (d-spacing, 17∼18 Å) in the out-of-plane direction and a π-π stacking peak (d-spacing, 3.5∼4.1 Å) in the in-plane direction. Organic field effect transistor (OFET) devices were fabricated with a bottom gate and top contact geometry. PTTBTz-F (μh = 4.49 × 10–2 cm2 V–1 s–1, on/off ratio = 1.13 × 107) and PTTBTz-OR (μh = 8.39 × 10–3 cm2 V–1 s–1, on/off ratio = 2.98 × 104) showed nearly 3 and 2 orders of magnitude higher hole mobility upon annealing at 305 and 260 °C, with compared to the unsubstituted PTTBTz.

Methoxylation of quinoidal bithiophene as a single regioisomer building block for narrow-bandgap conjugated polymers and high-performance organic field-effect transistors

2020 ◽  
Vol 8 (43) ◽  
pp. 15168-15174 ◽  
Author(s):  
Yunlong Sun ◽  
Yunpeng Zhang ◽  
Yang Ran ◽  
Longxian Shi ◽  
Qingsong Zhang ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Building Block ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Hole Mobility ◽  
Methoxyl Group ◽  
Organic Field Effect Transistors ◽  
Narrow Bandgap

Methoxyl group was introduced to obtain isomer-free methoxylation quinoidal bithiophene building block. Four polymers displayed narrow bandgap (<1.20 eV) and hole mobility of up to 2.70 cm2 V−1 s−1.

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