Low-Temperature Fabrication of Robust, Transparent, and Flexible Thin-Film Transistors with a Nanolaminated Insulator

Kwon, Jeong Hyun; Park, Junhong; Lee, Myung Keun; Park, Jeong Woo; Jeon, Yongmin; Shin, Jeong Bin; Nam, Minwoo; Kim, Choong‐Ki; Choi, Yang‐Kyu; Choi, Kyung Cheol

doi:10.1021/acsami.8b01438

Cited by 29 publications

(41 citation statements)

References 44 publications

(86 reference statements)

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“…In addition, filling of pinhole defects in the Al 2 O 3 ALD film in the course of the silamer being thermally cured made the TFE structure impermeable and corrosion-resistant. Notably, although various ALD nanolaminate structures have been proposed to improve their environmental stability by alternately depositing various barrier films at a few nanometer thickness, there have been no reports on environmentally stability improvement of barrier films using functional organic layer. ,,,, Therefore, we can fabricate a highly water-resistant and flexible inorganic/organic multilayer applicable to wearable encapsulations using a silamer layer and an ALD Al 2 O 3 film.…”

Section: Resultsmentioning

confidence: 99%

Design of Highly Water Resistant, Impermeable, and Flexible Thin-Film Encapsulation Based on Inorganic/Organic Hybrid Layers

Kwon

Jeong

Jeon

et al. 2018

ACS Appl. Mater. Interfaces

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The lack of a transparent, flexible, and reliable encapsulation layer for organic-based devices makes it difficult to commercialize wearable, transparent, flexible displays. The reliability of organic-based devices sensitive to water vapor and oxygen must be guaranteed through an additional encapsulation layer for the luminance efficiency and lifetime. Especially, one of the major difficulties in current and future OLED applications has been the absence of thin-film encapsulation with superior barrier performance, mechanical flexibility, and water-resistant properties. In this work, we fabricated highly water-resistant, impermeable, and flexible inorganic/organic multilayers with optimized Al2O3 and functional organic layers. The key properties of the fabricated multilayers were compared according to the thickness and functionality of the inorganic and organic layers. Improvement of the barrier performance is mainly attributed to the optimized thickness of the Al2O3 films, and is additionally due to the increased lag time and effective surface planarization effects caused by the use of micrometer-thick organic layers. As a result, the 3-dyad multilayer structure composed of 60-nm-thick Al2O3 layers deposited at 70 °C and 2-μm-thick silane-based inorganic/organic hybrid polymer (silamer) layers with layered silica exhibited the lowest WVTR value of 1.11 × 10-6 g/m2/day in storage conditions of 30°C/90% relative humidity. In addition, the multi-barrier exhibited good mechanical stability through the use of alternating stacks of brittle inorganic and soft organic layers, without showing a large increase in the WVTR after bending tests. In addition, silamer layers improved the environmental stability of the Al2O3 ALD film. The silamer layer coated on the Al2O3 film effectively worked as a protective layer against harsh environments. The effective contact at the interface of Al2O3/silamer makes the barrier structure more impermeable and corrosion-resistant. In this study, we not only demonstrated an optimized multilayer based on functional organic layers, but also provided a methodology for designing a wearable encapsulation applicable to wearable organic electronics.

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Section: Resultsmentioning

confidence: 99%

Design of Highly Water Resistant, Impermeable, and Flexible Thin-Film Encapsulation Based on Inorganic/Organic Hybrid Layers

Kwon

Jeong

Jeon

et al. 2018

ACS Appl. Mater. Interfaces

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“…Transparent conductive films (TCFs) have been widely used in flexible optoelectronic devices, such as organic light-emitting diodes, , organic solar cells, , organic field-effect transistors, , and electrochromic devices (ECDs). , A TCF is generally fabricated by coating a transparent conductive material (TCM) on transparent and flexible substrates (e.g., polymer film). − Indium tin oxide (ITO) is the commonly used TCM; however, it is fragile and easily cracks under mechanical deformation, limiting its applications in flexible optoelectronic devices. − Currently, a silver nanowire (AgNW) network coated on a polymer film is becoming a promising alternative to ITO owing to the advantages of high conductivity, high flexibility, and easy manufacturing. − The AgNWs are usually coated on the surface of polymer films using Meyer rod coating, , spin coating, , spray coating, , or doctor blading methods . However, the electromechanical stability of the obtained TCF is unsatisfying because of the weak adhesion between the AgNWs and polymer film .…”

Section: Introductionmentioning

confidence: 99%

“…Transparent conductive films (TCFs) have been widely used in flexible optoelectronic devices, such as organic light-emitting diodes, 1,2 organic solar cells, 3,4 organic field-effect transistors, 5,6 and electrochromic devices (ECDs). 7,8 A TCF is generally fabricated by coating a transparent conductive material (TCM) on transparent and flexible substrates (e.g., polymer film).…”

Section: ■ Introductionmentioning

confidence: 99%

Embedding Silver Nanowires into a Hydroxypropyl Methyl Cellulose Film for Flexible Electrochromic Devices with High Electromechanical Stability

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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Transparent conductive films (TCFs) based on silver nanowires (AgNWs) are becoming one of the best candidates in realizing flexible optoelectronic devices. The AgNW-based TCF is usually prepared by coating AgNWs on a transparent polymer film; however, the coated AgNWs easily detach from the polymer underneath because of the weak adhesion between them. Herein, a network of AgNWs is embedded in the transparent hydroxypropyl methyl cellulose film, which has a strong adhesion with the AgNWs. The obtained TCF shows high optical transmittance (>85%), low roughness (rms = 4.8 ± 0.5 nm), and low haze (<0.2%). More importantly, owing to the embedding structure and strong adhesion, this TCF also shows excellent electromechanical stability, which is superior to the reported ones. Employing this TCF in a flexible electrochromic device, the obtained device exhibits excellent cyclic electromechanical stability and high coloring efficiency. Our work demonstrates a promising TCF with superior electromechanical stability for future applications in flexible optoelectronics.

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“…Yu and co‐workers first reported flexible perovskite solar cells fabricated on biocompatible cellulose paper substrates modified by carbon and achieved a high PCE of 9.05% . Compared with the aforementioned matured plastic substrates, there is still great room for development in device performance and mechanical durability for cellulose substrate based devices . As a sustainable resource, bamboos possess the merits of fast growth, high cellulose content, especially the higher polymerization degree of cellulose fibrils, which boosts the mechanical properties of as‐prepared cellulose films .…”

Section: Introductionmentioning

confidence: 99%

Ultraflexible and Lightweight Bamboo‐Derived Transparent Electrodes for Perovskite Solar Cells

Zhu

Cheng

et al. 2019

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devices, flexible substrates play a key role to fabricate high-performance electronics. In the past decade, various flexible substrates have been greatly developed. For instance, Chongwu and co-workers fabricated silver nanowire films on flexible polyethylene terephthalate (PET) substrates with good mechanical flexibility and demonstrated the application in a touch panel. [7] Johansson and co-workers reported a polyethylene naphthalate (PEN) substrate coated by Ag nanowire network for an extremely lightweight and ultraflexible colloidal quantum dots solar cell. [8] Jeong and co-workers fabricated copper conductors on polyimide and polyethersulfone substrates, exhibiting the potential accessibility for flexible electronics. [9] The abovementioned flexible substrates exhibit excellent stretchable ability and high-flexible performance. Because of their excellent mechanical and chemical stability, it takes extremely long time for them to degrade or decompose in the nature, leading to environmental pollution. Therefore, more and more attention is paid to looking for flexi ble, biocompatible, and environmentally friendly biomass substrates for wearable devices. [6,[10][11][12][13] Flexible biomass substrates based on nanofibrillated cellulose have been explored and are expected to be used in wearable electronics due to their excellent mechanical properties, renewability, and raw material abundance. Ma and co-workers successfully fabricated gallium arsenide microwave devices on flexible wood-derived cellulose nanofibril paper. [14] Ju and co-workers reported flexible, transparent phototransistors on biodegradable wood-derived cellulose nanofibrillated fiber substrates toward environment friendly electronics. [15] Hu and co-workers fabricated flexible organic field-effect transistors on tailorable softwood-derived nanopapers. [16] These successful studies suggest the feasibility to fabricate environment friendly cellulose-based substrates for flexible electronics, and further accelerate development of the flexible wearable devices.Currently flexible perovskite solar cells (PSCs) have gained wide attention by their excellent performance and potential application in wearable energy devices. [13,[17][18][19] As is well known, high performance flexible perovskite devices are still based on nonbiocompatible and nondegradable plastic substrates such as PET, PEN, and polydimethylsiloxane. Yu and co-workers first reported flexible perovskite solar cells fabricated on Wearable devices are mainly based on plastic substrates, such as polyethylene terephthalate and polyethylene naphthalate, which causes environmental pollution after use due to the long decomposition periods. This work reports on the fabrication of a biodegradable and biocompatible transparent conductive electrode derived from bamboo for flexible perovskite solar cells. The conductive bioelectrode exhibits extremely flexible and light-weight properties. After bending 3000 times at a 4 mm curvature radius or even undergoing a crumpling test, it still shows excellent e...

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Low-Temperature Fabrication of Robust, Transparent, and Flexible Thin-Film Transistors with a Nanolaminated Insulator

Cited by 29 publications

References 44 publications

Design of Highly Water Resistant, Impermeable, and Flexible Thin-Film Encapsulation Based on Inorganic/Organic Hybrid Layers

Design of Highly Water Resistant, Impermeable, and Flexible Thin-Film Encapsulation Based on Inorganic/Organic Hybrid Layers

Embedding Silver Nanowires into a Hydroxypropyl Methyl Cellulose Film for Flexible Electrochromic Devices with High Electromechanical Stability

Ultraflexible and Lightweight Bamboo‐Derived Transparent Electrodes for Perovskite Solar Cells

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