Electrical performance of flexible OTFTs based on slot-die printed dielectric films with different thicknesses

Koutsiaki, Christina; Kaimakamis, T.; Zachariadis, Alexandros; Logothetidis, S.

doi:10.1016/j.matpr.2019.07.657

Cited by 7 publications

(4 citation statements)

References 14 publications

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“…Boukhili et al [ 31 ] made a comparison among different dielectric materials, including PVP, divinyl tetramethyl disiloxane‐bis (benzocyclobutene) (BCB) and poly (vinyl alcohol) (PVA), to evaluate different OTFT electrical properties. Koutsiaki et al [ 32 ] studied the electrical performance on OTFTs with different thickness of dielectric layers, which showed that the mobility of the transistor would decrease when the dielectric layer became thicker; at the same time, the current leakage could be reduced to a small value. The stability of a sensor is essential because it may have an influence on the device lifespan.…”

Section: Introductionmentioning

confidence: 99%

“…[ 34 ] The most important feature is high dielectric constant as mentioned above, which can reach ~4. [ 32 ] PVP can also be fabricated along with a wide range of substrates and semiconducting materials, including glass, polymer and inorganic components. [ 35 ] Similar to P3HT, PVP has a good solubility, [ 36 ] which implies that it is chemically friendly to the organic solution procedures.…”

Section: Introductionmentioning

confidence: 99%

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The adhesive energies between Poly(3‐hexylthiophene) and Polyvinylpyrrolidone for organic electronic devices: Hybrid‐exchange density‐functional‐theory studies

Choy

2023

J of Physical Organic Chem

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Studying the building blocks for organic electronics—molecules—is important for achieving a great performance for organic electronic devices. Poly(3‐hexylthiophene) (P3HT) and povidone (PVP) are common molecules chosen for the semiconducting and dielectric layers of organic electronic devices, respectively. Here, we have applied the hybrid‐exchange density‐functional theory, taking into account empirical dispersion forces and basis set superposition errors, to study the adhesive energies and optimal geometries when integrating the two types of molecules. To ease the analysis of the molecular structures, we have simplified the polymer chain structure to the monomer, dimer and trimer for the P3HT and PVP. By using B3LYP and BLYP functionals in combination with dispersion forces, we have found that the optimal inter‐molecular vertical distances between P3HT and PVP are approximately 3.6, 6 and 5 Å for monomer, dimer and trimer, respectively, with the lowest adsorption energy of ~−0.35, −0.15 and −0.45 eV. However, the sliding effect for the molecular combination is relatively small. These computational results can be potentially compared with the relevant experiments on the molecular crystal structure. The molecular orbitals of the P3HT and PVP molecules show that the charge density is mainly on the five‐member rings rather than the polymer chains, which further supports our finite‐chain approximation. Our calculations, especially the potential curves, could be useful for the optimal design of molecular structures for organic electronic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The adhesive energies between Poly(3‐hexylthiophene) and Polyvinylpyrrolidone for organic electronic devices: Hybrid‐exchange density‐functional‐theory studies

Choy

2023

J of Physical Organic Chem

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“…However, such a system is much more difficult to optimize due to the large number of process parameters [27,28]. Nevertheless, among many coating techniques, the slot-die technique is widely used to fabricate optoelectronic devices such as organic photovoltaics (OPVs) [29][30][31][32], sensors [33][34][35], organic thin-film transistors (OTFTs) [36][37][38], and OLEDs [25,[39][40][41][42][43][44] in both single- [45] and multi-layer configurations [46]. Emissive layers (EMLs), poly (3,4ethylenedioxythiophene) and poly(styrene sulfonate) mixture (PEDOT:PSS) [43,45,47,48], and other supportive layers [48][49][50] have been produced through this technique.…”

Section: Introductionmentioning

confidence: 99%

Efficient OLEDs Based on Slot-Die-Coated Multicomponent Emissive Layer

Witkowska

Glowacki

et al. 2022

Polymers

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The optimization of multicomponent emissive layer (EML) deposition by slot-die coating for organic light-emitting diodes (OLEDs) is presented. In the investigated EMLs, the yellow-green iridium complex (Ir) was doped in two types of host: a commonly used mixture of poly(N-vinylcarbazole) (PVK) with oxadiazole derivative (PBD) or PVK with thermally activated delayed fluorescence-assisted dopant (10-(4-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-10H-spiro[acridine-9,9′-fluorene], SpiroAC-TRZ). In this article, OLEDs with EML prepared in air by slot-die coating, facilitating industrial manufacturing, are confronted with those with spin-coated EML in nitrogen. OLEDs based on PVK:PBD + 2 wt.% Ir-dopant exhibit comparable performance: ~13 cd A−1, regardless of the used method. The highest current efficiency (21 cd A−1) is shown by OLEDs based on spin-coated PVK with 25 wt.% SpiroAC-TRZ and 2 wt.% Ir-dopant. It is three times higher than the efficiency of OLEDs with slot-die-coated EML in air. The performance reduction, connected with the adverse oxygen effect on the energy transfer from TADF to emitter molecules, is minimized by the rapid EML annealing in a nitrogen atmosphere. This post-treatment causes more than a doubling of the OLED efficiency, from 7 cd A−1 to over 15 cd A−1. Such an approach may be easily implemented in other printing techniques and result in a yield enhancement.

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“…Currently, the PE is not considered as the substitute for conventional silicon-based electronics. Instead the niche market for PE is considered to lie in the low-cost printed circuits based on conducting, organic semiconducting and dielectric materials based inks aiming at high-volume market segments, where the high performance of conventional electronics is not required [ 4 , 32 – 35 ]. This is owing to the modest performance (e.g.…”

Section: Introductionmentioning

confidence: 99%

High-performance printed electronics based on inorganic semiconducting nano to chip scale structures

et al. 2020

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The Printed Electronics (PE) is expected to revolutionise the way electronics will be manufactured in the future. Building on the achievements of the traditional printing industry, and the recent advances in flexible electronics and digital technologies, PE may even substitute the conventional silicon-based electronics if the performance of printed devices and circuits can be at par with silicon-based devices. In this regard, the inorganic semiconducting materials-based approaches have opened new avenues as printed nano (e.g. nanowires (NWs), nanoribbons (NRs) etc.), micro (e.g. microwires (MWs)) and chip (e.g. ultra-thin chips (UTCs)) scale structures from these materials have been shown to have performances at par with silicon-based electronics. This paper reviews the developments related to inorganic semiconducting materials based high-performance large area PE, particularly using the two routes i.e. Contact Printing (CP) and Transfer Printing (TP). The detailed survey of these technologies for large area PE onto various unconventional substrates (e.g. plastic, paper etc.) is presented along with some examples of electronic devices and circuit developed with printed NWs, NRs and UTCs. Finally, we discuss the opportunities offered by PE, and the technical challenges and viable solutions for the integration of inorganic functional materials into large areas, 3D layouts for high throughput, and industrial-scale manufacturing using printing technologies.

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Electrical performance of flexible OTFTs based on slot-die printed dielectric films with different thicknesses

Cited by 7 publications

References 14 publications

The adhesive energies between Poly(3‐hexylthiophene) and Polyvinylpyrrolidone for organic electronic devices: Hybrid‐exchange density‐functional‐theory studies

The adhesive energies between Poly(3‐hexylthiophene) and Polyvinylpyrrolidone for organic electronic devices: Hybrid‐exchange density‐functional‐theory studies

Efficient OLEDs Based on Slot-Die-Coated Multicomponent Emissive Layer

High-performance printed electronics based on inorganic semiconducting nano to chip scale structures

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