Organic field effect transistors (OFETs) of poly(p-phenylenevinylene) fabricated by chemical vapor deposition (CVD) with improved hole mobility

Bhat, Deepak; Jena, Sanjoy; Babusenan, Anu; Bhattacharyya, Jayeeta; Ray, Debraj

doi:10.1016/j.synthmet.2019.116108

Cited by 6 publications

(4 citation statements)

References 61 publications

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“…[38] These polymers are deposited by chemical vapor deposition, which provides a fine control over the film thickness at large coverage areas. [39,40] The fatigue behavior was investigated for two different film thickness of DPP-DTT by monitoring the change in electrical performance as a function of bending cycles. The insight gained is fundamental for the development of flexible electronics with pronounced fatigue resistance and long application lifetime.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Fatigue Resistance of Polydiketopyrrolo‐Pyrrole‐Dithienylthieno[3,2‐b]thiophene‐Based Flexible Field‐Effect Transistors

Kubik

Waliszewski

Nosal

et al. 2022

Adv Materials Inter

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Mechanical durability is one of the main obstacles of flexible organic electronic devices. In this work, the fatigue behavior of flexible field‐effect transistors based on a diketopyrrolo‐pyrrole‐dithienylthieno[3,2‐b]thiophene polymer is reported. An especially for that purpose designed bending setup allows to perform precise multiple deformation cycles of the transistor channel area while monitoring the device behavior. The transistors show high operational stability upon 100 bending cycles at a radius of 500 µm. Bending at smaller radius of 100 µm leaves the functionality of the parylene dielectric intact but induces serious mechanical fractures in the semiconducting film. Despite macroscopic defects, the transistors still reveal good reliability including high charge carrier mobility, due to presence of sufficient pathways for the charge carrier transport and to a low gate leakage. It is also observed that thinner polymer films are more sensitive to the deformation‐induced defects leading to a larger decrease in device performance, especially during the initial bending cycles. In thicker DPP‐DTT films, the crack propagation less affects the semiconductor/dielectric interface, at which the main charge carrier transport take place, resulting in a more stable device operation. Therefore, the work provides fundamental understanding of the fatigue behavior of flexible transistors based on semiconducting polymers.

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Section: Introductionmentioning

confidence: 99%

Mechanical Fatigue Resistance of Polydiketopyrrolo‐Pyrrole‐Dithienylthieno[3,2‐b]thiophene‐Based Flexible Field‐Effect Transistors

Kubik

Waliszewski

Nosal

et al. 2022

Adv Materials Inter

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“…When thermally annealed at 160 °C, OTFT devices based on thin films of r-PAzV show enhanced average hole and electron mobilities of up to 0.012 and 0.016 cm 2 V −1 s −1 , respectively. The charge carrier mobilities of r-PAzV-based devices are higher and more balanced than those of the devices based on the PAzE polymers, 49 and r-PAzV-based devices show higher hole mobility than the devices based on PPVs, 7,53,54,74 which are typical p-type semiconductors. The as-prepared OTFTs based on hhtt-PAzV show only hole transport, while thermally annealed devices exhibit an ambipolar transport behavior.…”

Section: ■ Introductionmentioning

confidence: 94%

Poly(2,6-azulene vinylene)s: Azulene Orientation Control and Property Studies

Xiang,

Vu,

et al. 2023

Macromolecules

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A class of nonbenzenoid analogues of poly(pphenylenevinylene)s (PPVs), 2,6-azulene-vinyl-based conjugated polymers (CPs) r-PAzV, hhtt-PAzV, and ht-PAzV, have been reported with different dipole arrangements of azulene units, where the five-membered ring and seven-membered ring of azulene core are defined as "head (H)" and "tail (T)", respectively. The PAzV polymers exhibit diverse backbone structures, proton responsiveness, an unusual relationship between crystallinity and regioregularity relative to conventional CPs, and balanced ambipolar charge transport. In regiorandom r-PAzV, the proportions of the H−T, H−H, and T−T linkages are about 40, 20, and 40%, respectively. The studies on solubility, thermal/optical properties, and microstructures of these PAzV polymers reveal that the presence of H−H and T−T arranged moieties in r-PAzV and hhtt-PAzV strengthens interchain interactions. Grazing-incidence wide-angle X-ray scattering measurements demonstrate enhanced long-range order with up to four orders of side-chain stacking reflections in as-spun films of r-PAzV and hhtt-PAzV. Williamson−Hall and Scherrer's analyses indicate that the lamellar crystallites in films of ht-PAzV have a much smaller size and lower crystallite quality relative to r-PAzV and hhtt-PAzV. Therefore, organic thin-film transistors based on r-PAzV and hhtt-PAzV display 2−4 orders higher charge carrier mobilities than those of ht-PAzV-based devices. The poor device performance of ht-PAzV might be attributed to the gradient electrostatic potential distribution and localized distribution of the Frontier molecular orbitals of the main chain. Our work enriches the family of PPV-like polymers, achieves the regulation of dipole arrangements of 2,6-azulene units together with clear structural analysis, and discloses that the dipole arrangements of azulene units along the polymer backbone have a great influence on the assembly of polymer chains.

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“…68,69 The mobility of conjugated polymer is typically in the order of 10 −5 -10 −2 cm 2 Vs −1 . [70][71][72] However, recent progress has been developed to overcome this drawback through various resolutions, such as introducing polymer modification through chemical and physical alterations. The modification is achieved by exploiting the backbone and side chain of the conjugated polymers via controlling polymer aggregation, 69 introducing donor and acceptor units into conjugated polymer, 70,73 adding dopants, 74 blending polymers with small molecules 75 and incorporation of fluorine atom.…”

Section: Intrinsic Factorsmentioning

confidence: 99%

“…This effect reduces the grain boundaries and significantly improves the charge carrier mobility. 72 Abdur et al reported that coating of OTS monolayer on top of aluminum oxide (Al 2 O 3 ) dielectric surface produces a high-quality pentacene active layer. 112 This is due to the lying plane (parallel) of the pentacene molecule onto the surface of the reactive substrate (also known as hydrophilic) after the deposition process.…”

Section: Intrinsic Factorsmentioning

confidence: 99%

Review—Charge Carrier Mobility of Organic Thin Film Transistor: Intrinsic and Extrinsic Influencing Factors Based on Organic Semiconducting Materials

Wahab

Abdulhameed²,

Ismail

et al. 2023

ECS J. Solid State Sci. Technol.

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The use of organic thin film transistors (OTFTs) is growing rapidly as an alternative to their inorganic counterparts due to their advantageous properties, such as easy processing and flexibility. The performance of OTFTs is still undergoing improvement and taking this as a recognition, this paper reviews various factors that influence the performance of the OTFTs, primarily in terms of field-effect mobility. The influencing factors reviewed in this article are divided into intrinsic and extrinsic factors for different organic semiconducting materials (OSMs). The intrinsic factors include the OSMs’ molecular orientation, OSM/dielectric interaction, and OSM/electrode interaction. The extrinsic factors are basically related to the OSM processing and OTFTs fabrication. For example, the article discusses how mixing, blending, and annealing affect the properties of the OSMs. The effect of the ambient atmosphere on OTFTs’ performance is also discussed. The aim of this article is to discuss the current trends related to one of the critical figures of merit of OTFTs, which is the mobility of charge carriers.

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Organic field effect transistors (OFETs) of poly(p-phenylenevinylene) fabricated by chemical vapor deposition (CVD) with improved hole mobility

Cited by 6 publications

References 61 publications

Mechanical Fatigue Resistance of Polydiketopyrrolo‐Pyrrole‐Dithienylthieno[3,2‐b]thiophene‐Based Flexible Field‐Effect Transistors

Mechanical Fatigue Resistance of Polydiketopyrrolo‐Pyrrole‐Dithienylthieno[3,2‐b]thiophene‐Based Flexible Field‐Effect Transistors

Poly(2,6-azulene vinylene)s: Azulene Orientation Control and Property Studies

Review—Charge Carrier Mobility of Organic Thin Film Transistor: Intrinsic and Extrinsic Influencing Factors Based on Organic Semiconducting Materials

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