凯发_Byung Hee Hong

Speaker-Byung Hee Hong

Byung Hee Hong
Seoul National University, Korea

Byung Hee Hong (b. 1971) received the BS (1998), MS (2000) and PhD (2002) degrees in chemistry from POSTECH in Korea. After spending 3.5 years as a postdoctoral researcher at the Columbia University (Advisor: Philip Kim), he joined the Department of Chemistry, Sungkyunkwan University (SKKU) as an Assistant Professor, in 2007. Now, he is an Associate Professor in the Department of Chemistry at Seoul National Univ. and also a Visiting Associate in Department of Physics at Harvard Univ.

Byung Hee Hong pioneered the large-scale synthesis of graphene by CVD, which triggered chemical research studies toward the practical applications of graphene. His first report on the CVD synthesis of graphene (Nature 457, 706 (2009)) has recorded the world highest citations in chemistry among the papers published since 2009. A year after, Byung Hee Hong developed the synthesis of ultra-large graphene based on roll-to-roll methods and applied the material to flexible touch screens (Nature Nanotech. 5, 574-578 (2010)), which is believed to be the first demonstration of the utilization of graphene materials in practical electronic devices.

For this contribution, Byung Hee Hong was invited by the Nobel Committee to give a presentation in the Novel Symposium on Graphene, five months prior to the announcement of the Nobel Physics Prize on graphene in 2010. The press release by the Royal Swedish Academy has cited Byung Hee Hong’s paper as one of the major research achievements that contributed to the prize, and his achievements are being exhibited in Nobel Museum. He is a Regional Editor for 2D Materials journal and a Strategic Advisory Board Member for EU Graphene Flagship Project. He spun-off a company called Graphene Square Inc. (http://www.graphenesq.com) in 2012, specialized in high-quality graphene and 2D materials synthesis equipment.

Title：Industrial Production of Graphene Films for Consumer Electronics: Batch vs. Roll-to-Roll Process&Graphene for Displays that Bend

SymposiumB02 Large-size, continuous Manufacture Technology of Graphene Film&B05 Wearable Devices

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Abstract

Industrial Production of Graphene Films for Consumer Electronics: Batch vs. Roll-to-Roll Process

The practical use of graphene in consumer electronics has not been demonstrated since the size, uniformity, and reliability problems are yet to be solved to satisfy industrial standards. Recently, the mass-productive graphene films were synthesized by hydrogen-free rapid thermal chemical vapor deposition (RT-CVD), roll-to-roll etching, and transfer methods, which enabled faster and larger production of homogeneous graphene film that satisfies industrial standards.1 This has enabled the actual application of the graphene film to capacitive multi-touch devices installed in the most sophisticated mobile phones. More recently, we have developed a roll-to-roll RT-CVD system that can synthesize graphene films continuously on a roll of Cu foils. In this talk, the advantages of using the roll-to-roll process compared to a batch process will be presented, and the remaining challenges will be also discussed.

Graphene for Displays that Bend

The use of graphene as a transparent electrode has already been demonstrated in a variety of flexible optoelectronic devices, including touch-screen sensors, organic light-emitting diodes and organic photovoltaic devices. The possibility of fabricating lightweight, thin and low-cost flexible electronics devices through continuous roll-to-roll processes is another important advantage of using graphene electrodes.

Despite this, considerable challenges must be overcome to integrate graphene-based transparent electrodes into commercial devices. These include the development of a low-cost, large-scale synthesis method for high-quality graphene with guaranteed uniformity and reproducibility; a defect- and residue-free transfer method that is compatible with conventional device manufacturing processes; doping processes that can assure stable, high electrical conductivity over long periods; a method to improve the environmental stability of graphene electrodes against moisture and chemicals in the air; and a method to decrease the contact resistance between electrodes and active materials.

One issue, in particular, with CVD-grown graphene is that it must be transferred to a perfectly flat surface. Most electronic devices, however, have an interconnected, multilayered structure. Although this is not a problem for indium tin oxide (ITO), as it can be sputtered onto irregularly shaped surfaces, the device architecture needs to be customized for two dimensions when using graphene electrodes. This limits the immediate replacement of ITO by graphene. Because of this, we anticipate that applications to flat and simple structures such as touch screens, smart windows, electromagnetic interference shields, lighting and transparent heater will be the first to be realized, whereas applications to flexible displays and microelectronic devices will follow some years later.