Large Scale Liquid Crystal Device with Graphene-based Electrodes

Petrov, Stefan; Marinova, Vera; Lin, Shiuan Huei; Chang, Chin-Liang; Lin, Yi; Hsu, Ken Yuh

doi:10.1515/odps-2017-0015

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Within these technologies, graphene has been used as an ITO replacement in standard [230,231] and flexible [232][233][234] OLED displays. Graphene has also been used in flexible alternating-current electroluminescent displays [235][236][237], as well as in LCDs [238][239][240]. Other applications of graphene in display technologies include increasing standard ITO OLED performance [241] and using as electrodes for GaN micro-LEDs [242].…”

Section: Applicationsmentioning

confidence: 99%

Review of fabrication methods of large-area transparent graphene electrodes for industry

Mustonen

Mackenzie

Lipsanen

2020

Front. Optoelectron.

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Graphene is a two-dimensional material showing excellent properties for utilization in transparent electrodes; it has low sheet resistance, high optical transmission and is flexible. Whereas the most common transparent electrode material, tin-doped indium-oxide (ITO) is brittle, less transparent and expensive, which limit its compatibility in flexible electronics as well as in low-cost devices. Here we review two large-area fabrication methods for graphene based transparent electrodes for industry: liquid exfoliation and low-pressure chemical vapor deposition (CVD). We discuss the basic methodologies behind the technologies with an emphasis on optical and electrical properties of recent results. State-of-the-art methods for liquid exfoliation have as a figure of merit an electrical and optical conductivity ratio of 43:5, slightly over the minimum required for industry of 35, while CVD reaches as high as 419.

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Section: Applicationsmentioning

confidence: 99%

Review of fabrication methods of large-area transparent graphene electrodes for industry

Mustonen

Mackenzie

Lipsanen

2020

Front. Optoelectron.

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“…One particular application of graphene is its use as a transparent conducting electrode (TCE) in devices such as solar cells, displays or wearable electronics, by leveraging its high optical transparency, electrical conductivity, chemical stability and mechanical strength [14]. Absorbing only 2.3% of the impinging lightwave in the visible (VIS) and near-infrared (NIR) spectrum, single-layer graphene has been demonstrated, for instance, as a viable and lower-cost substitute to indiumtin-oxide (ITO) in VIS/NIR liquid-crystal (LC) modulators [15][16][17]. More importantly, graphene can provide TCE solutions in lower-frequency parts of the electromagnetic spectrum where ITO is opaque, such as in the emerging field of terahertz (THz) technology.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and spectroscopic characterization of graphene transparent electrodes on flexible cyclo-olefin substrates for terahertz electro-optic applications

et al. 2020

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We demonstrate graphene on flexible, low-loss, cyclo-olefin polymer films as transparent electrodes for terahertz electro-optic devices and applications. Graphene was grown by chemical vapor deposition and transferred to cyclo-olefin polymer substrates by the thermal release tape method as layers on an approximate area of 4 cm 2 . The structural and electromagnetic properties of the graphene samples as well as their spatial variation were systematically mapped by means of µRaman, terahertz time-domain and mid-infrared spectroscopy. Thanks to the small thickness and very low intrinsic absorption of the employed substrates, both high transmittance and conductivity were recorded, demonstrating the suitability of the technique for the fabrication of a new class of transparent and flexible electrodes working in the terahertz spectrum.

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“…Such LC cells have two major components: the indium tin oxide (ITO) electrodes and the polyimide (PI) alignment layers. Since MGP has a few advantages over ITO electrodes, such as better mechanical strength, higher chemical resistance, and higher mechanical flexibility, several reports in the literature have shown that MGP can serve as an ITO replacement in an LC device [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Characterizations of a graphene-polyimide hybrid electro-optical liquid crystal device

Basu

Atwood

2018

OSA Continuum

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A planar liquid crystal (LC) cell is designed by placing together a monolayer graphene coated glass slide and a planar-aligning polyimide layer on an indium tin oxide (ITO) coated glass slide. It is shown that the monolayer graphene film on one side of the cell can serve as the planar-alignment agent. At the same time, the monolayer graphene film also functions as the transparent electrode. The successful optical and electro-optical operations of this hybrid LC cell with monolayer graphene on one side and with ITO and associated planaraligning polyimide on the other side are demonstrated. The measured optical transmission of the graphene electrode is found to be much better than that of the combined ITO-PI layers. The electro-optical effect and the dynamic electro-optic response of the LC in this graphenepolyimide-based hybrid cell reveal the typical director reorientation of the LC on the application of an electric field. Additionally, the MGP film serves as the transparent conductive electrode as well. 2. Experiments, results, and discussion In this section, we present (a) the fabrication of the MGP-PI hybrid LC cell with optical transmission properties of MGP and PI/ITO slides, (b) the electro-optical effect of the LC in the cell, and finally, (c) the dynamic response of the LC in the cell.

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Large Scale Liquid Crystal Device with Graphene-based Electrodes

Cited by 5 publications

References 13 publications

Review of fabrication methods of large-area transparent graphene electrodes for industry

Review of fabrication methods of large-area transparent graphene electrodes for industry

Fabrication and spectroscopic characterization of graphene transparent electrodes on flexible cyclo-olefin substrates for terahertz electro-optic applications

Characterizations of a graphene-polyimide hybrid electro-optical liquid crystal device

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