Improving the performance of organic thin film transistors formed on a vacuum flash-evaporated acrylate insulator

Ding, Ziqian; Abbas, Ghulam; Assender, Hazel E.; Morrison, John J.; Sanchez-Romaguera, Veronica; Yeates, Stephen G.; Taylor, David

doi:10.1063/1.4839275

Cited by 18 publications

(22 citation statements)

References 31 publications

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“…It is known that absorbed atmospheric moisture can be a source of hole traps which is reflected in transfer curves as a more negative turn-on voltage and eventually lower mobility [25]. The un-buffered transistor in this work showed carrier mobility of ~0.05 cm 2 /Vs, on/off ratio of 10 4 and turn-on voltage close to 0 V. The low mobility was likely due to the undesirable surface energy which is prone to yielding poor crystallinity at the very near surface in deposited films of small molecule semiconductors as discussed in our recent paper [23].…”

Section: Resultsmentioning

confidence: 86%

“…thin aluminium oxide films treated with a self-assembled monolayer of phosphonic acid [22]. In our case, it was found to be beneficial to buffer the polar TPGDA dielectric with a thin, spin-coated film of polystyrene to produce a low polarity surface [23]. As an alternative to spin-coated polystyrene and in keeping with the aim of developing an all-vacuum, R2R-compatible process, we also report here the vacuum-flash evaporation and curing of a thin film of lauryl acrylate as a buffer layer on TPGDA.…”

Section: Introductionmentioning

confidence: 99%

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Vacuum production of OTFTs by vapour jet deposition of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) on a lauryl acrylate functionalised dielectric surface

Ding

Abbas

Assender

et al. 2016

Organic Electronics

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Roll-to-roll (R2R) production of organic transistors and circuits require patterned deposition of organic layers at high deposition rate. Here we demonstrate a vapour-jet process for the rapid deposition of the organic semiconductor dinaphtho [2,3-The deposition rate achieved, equivalent to ~200 nm/s onto a stationary substrate, was several orders of magnitude faster than ordinary thermal evaporation. Nevertheless, transistor yield was 100% with an average mobility of 0.4 cm 2 /Vs in a single pass deposition onto a substrate moving at 0.15 m/min. We also demonstrate a vacuum, high rate R2R-compatible process for surfacefunctionalising a gate dielectric layer with lauryl acrylate which enabled an all-vacuum route to the fabrication of a five-stage ring oscillator.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Vacuum production of OTFTs by vapour jet deposition of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) on a lauryl acrylate functionalised dielectric surface

Ding

Abbas

Assender

et al. 2016

Organic Electronics

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“…This suggests that the lower surface energy of the OTS‐treated substrate than that of DNTT could induce favorable nucleation of the DNTT crystals on the substrate, inducing DNTT layer formation under the PS layer. In contrast, the larger surface energy of the UV/O 3 ‐treated substrate inhibits the nucleation of DNTT, and alternatively, the PS layer with a relatively larger surface energy (47.5 mN m −1 ) was favorably formed on the substrate on which the nucleation and deposition of DNTT occurred. The effect of the isomer ratio of the precursor to the deposition position is not clear.…”

mentioning

confidence: 99%

Single‐Crystal‐Like Organic Thin‐Film Transistors Fabricated from Dinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (DNTT) Precursor–Polystyrene Blends

et al. 2015

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High-mobility short-channel organic thin-film transistors fabricated using a dinaphtho[2,3-b:2',3'-f]thieno[3,2-b]-thio--phene (DNTT) precursor (5,14-N--phenylmaleimide DNTT, endo-isomer-rich fraction) and polystyrene (PS) blends are reported. The DNTT grains are "single-crystal"-like and the field-effect mobility of the devices ranges up to 4.7 cm(2) V(-1) s(-1). The PS layer functions as a hydrophobic passivation layer on the Si/SiO2 substrate.

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“…To provide structure and a nonconductive layer, a tri(propylene glycol) diacrylated (TPGDA) material was developed as described in the Methods section of the Supporting Information. TPGDA has been used in previous studies to produce organic thin‐film transistors through a vacuum flash‐evaporation process and cured by electron beam. As TPGDA contains photosensitive acrylate groups, the curing reaction can also be initiated under UV light with the presence of proper photoinitiators through the free‐radical photopolymerization…”

Section: Development and Uv Curing Of A Dielectric Inkmentioning

confidence: 99%

3D Inkjet Printing of Electronics Using UV Conversion

Saleh

Zhang

et al. 2017

Adv Materials Technologies

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additional research challenges, namely in their depo sition, conversion, and interfaces. The opportunity for AM more generally has been determined by its functionality over more traditional manufacturing methods; where geometrical complexity is an inherent strength. The realization of mul tifunctional AM (MFAM) could augment this opportunity through the processing of multiple materials to gain further com ponent function in the final part. [7][8][9][10][11][12] Pre vious work in multiple material deposition has focused on the grading of materials to enhance physical, mechanical, and bio logical charac teristics. [4,5,13] However, the concurrent deposition of dissimilar mate rials is in its infancy, due in the main to the disparate materials processing require ments for metals, polymers, and ceramics.In general the 3D printing of electronic structures is dominated by the conformal printing of conductive materials onto the surface of a dielectric structure (otherwise known as Direct Write), [14][15][16][17][18] or the embed ment of conductive elements within previously 3Dprinted dielec tric materials. [19][20][21][22] Other reports have demonstrated the printing of conductive, semiconductive and dielectric materials in a single component, but these were limited to a small number of layers (<10 layers) and hence vertical heights of a few 100 µm, limiting the aspect ratio of these 3D conductive structures. [20,[23][24][25][26] A com mercial product, Voxel 8, was recently launched to extrude con ductive pastes and thermal plastics in a single 3D printing appa ratus. [27] This approach shows that the 3D printing of functional tracks is possible but the method is often limited by the low spatial resolution of the process being used (e.g., extrusionbased AM).Recently, inkjet printing has been used for the deposition of a wide range of functional inks with a diverse spectrum of prop erties. [26,[28][29][30][31][32] The fact that inks are ejected from print heads with a large number of small nozzles offers scalability through a droplet on demand (DoD) regime, one that is commonly ena bled through piezoelectric inkjet print technology. This regime is key to enable the deposition of different materials alongside each other, required for MFAM. DoD inkjet printing has been reported as a tool for multimaterial fabrication due to the flex ibility of the technology to dynamically adapt different patterns and materials in contrast to other printing and manufacturing technologies that require fixed mask or tooling. DoD tech nology is being applied in a diverse portfolio of applications, for example in biology, tissue bioprinting, multienzyme inkjet printing, and various types of cell printing have been recently reported. [13,[33][34][35][36] In electronics, a wide range of inkjetprinted applications have been demonstrated, ranging from inkjet printing of passive components, [37][38][39][40] active components (e.g.,The production of electronic circuits and devices is limited by current manufacturing methods that limit both the form...

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Improving the performance of organic thin film transistors formed on a vacuum flash-evaporated acrylate insulator

Abstract: Articles you may be interested inThe importance of spinning speed in fabrication of spin-coated organic thin film transistors: Film morphology and field effect mobility Appl. Phys. Lett.

Cited by 18 publications

References 31 publications

Vacuum production of OTFTs by vapour jet deposition of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) on a lauryl acrylate functionalised dielectric surface

Vacuum production of OTFTs by vapour jet deposition of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT) on a lauryl acrylate functionalised dielectric surface

Single‐Crystal‐Like Organic Thin‐Film Transistors Fabricated from Dinaphtho[2,3‐b:2′,3′‐f]thieno[3,2‐b]thiophene (DNTT) Precursor–Polystyrene Blends

3D Inkjet Printing of Electronics Using UV Conversion

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