Organic field-effect transistors with a sandwich structure from inserting 2,2′,2″-(1,3,5-benzenetriyl)tris[1-phenyl-1H-benzimidazole] in the pentacene active layer

Yu, Xinge; Yu, Junsheng; Zhou, Jianlin; Huang, Wei; Lin, Hui

doi:10.1051/epjap/2013120263

Cited by 7 publications

(7 citation statements)

References 33 publications

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“…The sharp first-order peak and distinct three higher order peaks can be matched to a sequence of (00 l ) reflection lines with multiple d spacings on the basis of the crystallographic parameters of pentacene: the four reflection peaks located at 5.9°, 11.6°, 17.4°, and 23.1° are equal to 15.0, 7.6, 5.1, and 3.9 Å, which correspond to the highly ordered triclinic pentacene film. In the cases of single-layered mCP:2CzPN and TPBi films grown on SiO 2 , as displayed in Figure b,c, there were no peaks, indicating that the films were amorphous. , In the cases of the bi- and trilayered films in Figure d,e, the diffractograms displayed a simple feature composed of lower signal-to-noise ratio and distinct individual peaks from only the bottom pentacene films. Preparation of smooth, continuous crystalline pentacene films results in favorable hopping of the majority charge carriers between the well-packed grain crystallites, which is essential in devising high-performance, heterojunction-based OLETs.…”

Section: Results and Discussionmentioning

confidence: 93%

“…In the cases of single-layered mCP:2CzPN and TPBi films grown on SiO 2 , as displayed in Figure 3b,c, there were no peaks, indicating that the films were amorphous. 36,37 In the cases of the bi-and trilayered films in Figure 3d,e, the diffractograms The PL spectra of the different films were monitored using a laser radiation with an excitation wavelength (λ ex ) in the region of 290−330 nm. The typical normalized PL spectra of singlelayered films of mCP, 2CzPN, and TPBi are displayed in Figure 4a−c; the PL peaks were located approximately at 351/ 366, 502, and 385 nm, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Organic Light-Emitting Transistors Based on Pentacene and 4,5-Di(9H-carbazol-9-yl)phthalonitrile Doped onto 1,3-Bis(N-carbazolyl)benzene

Kim

Choi

2019

J. Phys. Chem. C

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In this study, multilayered, organic-based lightemitting transistors (OLETs) were produced and characterized. The neutral cluster beam deposition method was applied to successively deposit organic semiconducting layers of pentacene, 4,5-di(9H-carbazol-9-yl)phthalonitrile (2CzPN) doped onto 1,3bis(N-carbazolyl)benzene (mCP), and 1,3,5-tris(1-phenyl-1Hbenzimidazol-2-yl)benzene (TPBi) as the hole-transport, emissive, and electron-transport layers, respectively. The effects of drain electrodes (Au or Li/Al) and TPBi on the device performance were examined under ambient conditions. The bilayered pentacene (bottom, 50 nm)/mCP:2CzPN (top, 50 nm) and trilayered pentacene (bottom, 50 nm)/mCP:2CzPN (middle, 50 nm)/TPBi (top, 10 nm) OLETs demonstrated both electrical switching functionality and control of electroluminescence (EL) in air. In particular, the EL intensity (I EL ) was significantly enhanced in the asymmetric bilayered devices adopting a low work function Li/Al drain electrode owing to the lower electron injection barrier. The operating light emission mechanisms responsible for the observed EL and recombination zone were discussed with the aid of photographic images provided by a charge-coupled device camera.

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Section: Results and Discussionmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 99%

Organic Light-Emitting Transistors Based on Pentacene and 4,5-Di(9H-carbazol-9-yl)phthalonitrile Doped onto 1,3-Bis(N-carbazolyl)benzene

Kim

Choi

2019

J. Phys. Chem. C

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“…2d). It is known that the smaller the value of FWHM, the higher the crystal quality [11,33,34]. Judging from the XRD measurements, a low withdrawal speed during dip-coating resulted in high crystallinity [35][36][37][38].…”

Section: Resultsmentioning

confidence: 99%

Continuous and highly ordered organic semiconductor thin films via dip-coating: the critical role of meniscus angle

Liu

Zhang

et al. 2020

Sci. China Mater.

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Dip-coating is a low-cost, high-throughput technique for the deposition of organic semiconductors over large area on various substrates. Tremendous studies have been done and many parameters such as withdrawal speed, solvent type and solution concentration have been investigated. However, most of the depositions were ribbons or dendritic crystals with low coverage of the substrate due to the ignorance of the critical role of dynamic solution-substrate interactions during dip-coating. In this study, meniscus angle (MA) was proposed to quantify the real-time in-situ solutionsubstrate interactions during dip-coating. By proper surface treatment of the substrate, the value of MA can be tuned and centimeter-sized, continuous and highly ordered organic semiconductor thin films were achieved. The charge transport properties of the continuous thin films were investigated by the construction of organic field-effect transistors. Maximum (average) hole mobility up to 11.9(5.1) cm 2 V −1 s −1 was obtained. The average mobility was 82% higher than that of ribbon crystals, indicating the high crystallinity of the thin films. Our work reveals the critical role of dynamic solutionsubstrate interactions during dip-coating. The ability to produce large-area, continuous and highly ordered organic semiconductor thin films by dip-coating could revival the old technique for the application in various optoelectronics.

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“…Moreover, small molecules have many advantages in photovoltaics because their molecular structures can be determined precisely and easily, and their solubility is high. 13–16…”

Section: Introductionmentioning

confidence: 99%

Theoretical, spectroscopical, and experimental investigations of small azomethine molecules for organic solar cells

Göreci

2020

Journal of Chemical Research

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Small azomethine molecules ( 4,4′-bis((2-hydroxy-4-octyloxyphenyl)methylimino)diphenylmethane (BP-DPM) and 4,4′-bis((2-hydroxy-4-octyloxyphenyl)methylimino)diphenyl ether (BP-DPE)) for photovoltaic applications were synthesized by condensation of appropriate arylaldehydes and arylendiamines and characterized using Fourier-transform infrared spectroscopy, 1H NMR, 13C NMR, and liquid chromatography–mass spectrometry. Azomethine molecules are additives in organic solar cells. The effect of a possible energy transfer between BP-DPE and P3HT on the photovoltaic performance of devices employing ternary blends of BP-DPE:P3HT: phenyl-C61-butyric acid methyl ester (PCBM) was investigated by absorption and emission spectra. The devices employing BP-DPE:P3HT:PCBM with 1:4 ratio exhibited a Jsc of 4.2 mA cm−2, Voc of 575 mV, and FF of 0.27 which led to a power conversion efficiency (PCE) of 0.65%. In addition, density functional theory calculations (DFT/B3LYP/6-31G(d)) were used to determine the optimized molecular geometry, highest occupied molecular orbital–lowest unoccupied molecular orbital energies, electronic structures, and the molecular electrostatic potential surfaces of the molecules.

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Organic field-effect transistors with a sandwich structure from inserting 2,2′,2″-(1,3,5-benzenetriyl)tris[1-phenyl-1H-benzimidazole] in the pentacene active layer

Cited by 7 publications

References 33 publications

Organic Light-Emitting Transistors Based on Pentacene and 4,5-Di(9H-carbazol-9-yl)phthalonitrile Doped onto 1,3-Bis(N-carbazolyl)benzene

Organic Light-Emitting Transistors Based on Pentacene and 4,5-Di(9H-carbazol-9-yl)phthalonitrile Doped onto 1,3-Bis(N-carbazolyl)benzene

Continuous and highly ordered organic semiconductor thin films via dip-coating: the critical role of meniscus angle

Theoretical, spectroscopical, and experimental investigations of small azomethine molecules for organic solar cells

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