Research

NOVEL FABRICATION PROCESS FOR HIGH-PERFORMANCE FLEXIBLE IGZO TFT

Emerging electronics have revolutionized the life of human beings. For next generation electronic devices ...

NOVEL FABRICATION PROCESS FOR HIGH-PERFORMANCE FLEXIBLE IGZO TFT

Status: in progress (2015 ~ present)

Team: Taewon Seo, Seongmin Park, Suwon Seong


Emerging electronics have revolutionized the life of human beings. For next generation electronic devices, a thin-film transistor (TFT), basic building block of large-area circuits, requires more and more high performance such as large current density, fast switching speed, and outstanding uniformity for large-area applications in displays and multifunctional sensors. Tolerance against mechanical stress and transparency are also essential for flexible devices. Amorphous indium-gallium-zinc-oxide (a-IGZO) is an excellent semiconducting material fulfilling these demands. Our group develops novel fabrication methods and device structures for high-performance flexible IGZO TFTs.


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3-D FLEXIBLE CIRCUIT

The development of silicon VLSI technology has followed Moore’s law, which states that the number of transistors on integrated circuits ...

3-D FLEXIBLE CIRCUIT

Status: in progress (2018 ~ present)

Team: Seongmin Park, Suwon Seong


The development of silicon VLSI technology has followed Moore’s law, which states that the number of transistors on integrated circuits doubles every year. However, as the size of the state-of-the-art transistor shrunk to just a few nanometers, equivalent to tens of atoms, engineers have developed a new technology to stack transistors vertically. This 3-D semiconductor technology is advantages in improving the overall performance, energy efficiency, and functionality. In industry, NAND flash memory is fabricated by using the 3-D technology, and it’s capacity has been increased rapidly. Our research goal is to establish a novel technology for 3-D flexible devices, and to develop large-area applications with a variety of functionalities including sensors and communications.


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ACTIVE LENS FOR THE NEXT GENERATION WIRELESS SYSTEM

Emerging electronics have revolutionized the life of human beings. Technological requirements ...

ACTIVE LENS FOR THE NEXT GENERATION WIRELESS SYSTEM

Status: in progress (2016 ~ present)

Team: Hyuk Park, Juyoung Yun


Since the revolution in wireless communication by Guglielmo Marconi, the amount of data over mobile networks has been increased drastically. The next generation wireless systems, 5G, aim to provide much higher data rate and bandwidth at tens of GHz and require entirely new hardware infrastructure. Our group studies flexible active lens that can be manipulated electrically to control the beam shape in real time for the next generation wireless system.


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FLEXIBLE FULL-COLOR ELECTRONIC PAPER

Recent advancement in display technology has been mainly focused on transmissive displays, which generate ...

FLEXIBLE FULL-COLOR ELECTRONIC PAPER

Status: in progress (2017 ~ present)

Team: Seongmin Park


Recent advancement in display technology has been mainly focused on transmissive displays, which generate and emit light, such as OLED and LCD. In contrast to conventional displays, most objects that we see reflect photons from the sun or electric lights; we feel more comfortable when detecting objects through reflected light rather than emitted light. Electronic paper (e-paper) works like ordinary paper, and its screen is controlled by electrical signal. E-paper generally consumes much lower power than conventional displays as there is no need for embedded light source, which is an essential property for portable applications. Despite of its advantages, current e-paper technology has several drawbacks such as rigid form factor and black-and-white color. We develop new technology for flexible and full-color e-paper that can open up niche applications complementary to current displays.


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SKIN-ATTACHABLE SENSOR

In recent years, skin-attachable electronic sensors have received significant attention with innovation in...

SKIN-ATTACHABLE SENSOR

Status: in progress (2015 ~ present)

Team: Inyeol Yun, Jinpyeo Jeung, Hyungmin Ko, Yunsik Kim


In recent years, skin-attachable electronic sensors have received significant attention with innovation in electronics form factor and increased interests in the healthcare sector. Skin-attachable sensor can provide vital clinical information and operate in real time with convenience. However, several challenges are still needed to be solved for practical utilization, such as conformal contact, flexibility, low-power operation, wireless communication, and so on. We aim to develop key technologies and killer applications for skin-attachable sensor with novel design, materials processing, and device fabrication.


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ELECTRICAL STIMULATION FOR HEALTHCARE APPLICATIONS

The signal transmission in the human body is mostly carried out by electricity. Thus, we can diagnose and treat ...

ELECTRICAL STIMULATION FOR HEALTHCARE APPLICATIONS

Status: in progress (2018 ~ present)

Team: Inyeol Yun, Jinpyeo Jeung


The signal transmission in the human body is mostly carried out by electricity. Thus, we can diagnose and treat the body by reading (electrophysiology) and sending (electrical stimulation) electrical signals. Electrical muscle stimulation (EMS) and transcutaneous electrical nerve stimulation (TENS) are the most representative examples of electrical therapy. EMS is a method to mimic the electrical signals that are sent from the brain to contract muscles. It can enhance the treatment of muscular skeletal disease and muscle/rehabilitation training. TENS modulates the neural transmission from pain receptors in order to relieve chronic pain that is not induced by certain pathological causes. However, current EMS and TENS systems operate with pre-programmed patterns without detecting the status of target tissue in real time and cannot cure the root cause of pain. We aim to overcome the shortcomings of current electrical stimulation systems described above and to develop wearable and low-power electrical stimulation devices for various healthcare applications.


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FLEXIBLE SKIN ELECTRODE FOR HUMAN-ELECTRONICS INTERFACE

Skin plays an important role as an interface between the human body and electronics. For sensing applications, tiny electric ...

FLEXIBLE SKIN ELECTRODE FOR HUMAN-ELECTRONICS INTERFACE

Status: in progress (2018 ~ present)

Team: Jinpyeo Jeung


Skin plays an important role as an interface between the human body and electronics. For sensing applications, tiny electric signals from the body need to be measured with high sensitivity; electric signals are required to be transmitted into the body without loss from the interface for stimulations. Our group develops a flexible skin electrode with high signal quality and outstanding conformity for excellent human–electronics interface.


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SKIN-ATTACHABLE FLEXIBLE INFRARED SENSOR

A variety of biometric information can be obtained by near-infrared spectroscopy (NIRS): tissue metabolism...

FLEXIBLE SKIN ELECTRODE FOR HUMAN-ELECTRONICS INTERFACE

Status: in progress (2018 ~ present)

Team: Jinpyeo Jeung, Hyungmin Ko, Taewon Seo


A variety of biometric information can be obtained by near-infrared spectroscopy (NIRS): tissue metabolism, physical/chemical structure, muscular activity, etc. In an array of infrared sensors, medical imaging is performed to diagnose a person's critical health condition. Especially, to monitor the status in daily lives, the infrared sensor array needs to have a thin flexible form factor. Our group develops a novel thin-film device that integrates multi-channel infrared sources, detectors, and optics for real-time monitoring.


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ENGINEERING CHARGE-TRAPPING LAYER IN FLASH MEMORY

In recent years, rapid developments in artificial intelligence, big data, and cloud computing dramatically increased the demand for ...

ENGINEERING CHARGE-TRAPPING LAYER IN FLASH MEMORY

Status: in progress (2017 ~ present)

Team: Seongmin Park


In recent years, rapid developments in artificial intelligence, big data, and cloud computing dramatically increased the demand for high-capacity and high-speed data storage. Flash memory, based on charge trapping effects in thin film, is most widely used storage medium in personal devices as well as cloud servers. Technical innovations, such as scaling, three-dimensional vertical stacking, and materials optimization, have continuously advanced the performance of flash memory. Our research focuses on the charge-trapping layer, where data is stored. The charge and trap distributions in this layer significantly affect the endurance, retention, and capacity of the memory device. Not only are we expecting dramatically improved storage performance, but also paving the way for the next-generation neuromorphic hardware platforms.


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