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Featured researches published by Chang-Seok Lee.


Nano Letters | 2016

Self-Aligned Multichannel Graphene Nanoribbon Transistor Arrays Fabricated at Wafer Scale

Seong-Jun Jeong; Sanghyun Jo; Jooho Lee; Kiyeon Yang; Hyangsook Lee; Chang-Seok Lee; Heesoon Park; Seongjun Park

We present a novel method for fabricating large-area field-effect transistors (FETs) based on densely packed multichannel graphene nanoribbon (GNR) arrays using advanced direct self-assembly (DSA) nanolithography. The design of our strategy focused on the efficient integration of the FET channel and using fab-compatible processes such as thermal annealing and chemical vapor deposition. We achieved linearly stacked DSA nanopattern arrays with sub-10 nm half-pitch critical dimensions (CD) by controlling the thickness of topographic Au confinement patterns. Excellent roughness values (∼10% of CD) were obtained, demonstrating the feasibility of integrating sub-10 nm GNRs into commercial semiconductor processes. Based on this facile process, FETs with such densely packed multichannel GNR arrays were successfully fabricated on 6 in. silicon wafers. With these high-quality GNR arrays, we achieved FETs showing the highest performance reported to date (an on-to-off ratio larger than 10(2)) for similar devices produced using conventional photolithography and block-copolymer lithography.


ACS Nano | 2017

Fully Stretchable Optoelectronic Sensors Based on Colloidal Quantum Dots for Sensing Photoplethysmographic Signals

Taeho Kim; Chang-Seok Lee; Sangwon Kim; Jaehyun Hur; Sangmin Lee; Keun Wook Shin; Young-Zoon Yoon; Moon Kee Choi; Jiwoong Yang; Dae-Hyeong Kim; Taeghwan Hyeon; Seongjun Park; Sungwoo Hwang

Flexible and stretchable optoelectronic devices can be potentially applied in displays, biosensors, biomedicine, robotics, and energy generation. The use of nanomaterials with superior optical properties such as quantum dots (QDs) is important in the realization of wearable displays and biomedical devices, but specific structural design as well as selection of materials should preferentially accompany this technology to realize stretchable forms of these devices. Here, we report stretchable optoelectronic sensors manufactured using colloidal QDs and integrated with elastomeric substrates, whose optoelectronic properties are stable under various deformations. A graphene electrode is adopted to ensure extreme bendability of the devices. Ultrathin QD light-emitting diodes and QD photodetectors are transfer-printed onto a prestrained elastomeric layout to form wavy configurations with regular patterns. The layout is mechanically stretchable until the structure is converted to a flat configuration. The emissive and active area itself can be stretched or compressed by buckled structures, which are applicable to wearable electronic devices. We demonstrate that these stretchable optoelectronic sensors can be used for continuous monitoring of blood waves via photoplethysmography signal recording. These and related systems create important and unconventional opportunities for stretchable and foldable optoelectronic devices with health-monitoring capability and, thus, meet the demand for wearable and body-integrated electronics.


Archive | 2011

METHOD AND SYSTEM FOR WIRELESS CHARGING USING RADIO WAVE

Young-Shik Shin; Dae-Hyun Sim; Chang-Seok Lee; Beom-Soo Cho; Hyunsoo Kim; Se-Yeon Kim


Archive | 2006

Self-calibration method for use in a mobile transceiver

Hyun-Ii Kang; Chang-Seok Lee; Jaekon Lee; Young-Hwan Lee


Archive | 2007

METHOD AND APPARATUS FOR CORRECTING SIGNAL-TO-NOISE RATIO IN MOBILE TERMINAL

Chang-Seok Lee; Boris Kisselev; Kang-Hoon Lee; Dae-Hyun Sim; Dong-jun Lee


Archive | 2010

Key input method and apparatus for portable apparatus

Young-Shik Shin; Kwang-Cheol Choi; Chang-Seok Lee


Archive | 2009

MOBILE COMMUNICATION TERMINAL AND METHOD OF AUTOMATICALLY EXECUTING AN APPLICATION IN ACCORDANCE WITH THE CHANGE OF AN AXIS OF A DISPLAY IN THE MOBILE COMMUNICATION TERMINAL

Young-Skik Shin; Kuen Shin; Chang-Seok Lee


Archive | 2015

Wiring structure and electronic device employing the same

Chang-Seok Lee; Hyeon-Jin Shin; Seongjun Park; Donghyun Im; Hyun Park; Keunwook Shin; Jong-Myeong Lee; HanJin Lim


Archive | 2014

GRAPHENE-METAL BONDING STRUCTURE, METHOD OF MANUFACTURING THE SAME, AND SEMICONDUCTOR DEVICE HAVING THE GRAPHENE-METAL BONDING STRUCTURE

Jaeho Lee; Hyeon-Jin Shin; Min-Hyun Lee; Chang-Seok Lee


Archive | 2006

Impulse generator for outputting negative and positive impulses

Young-Hwan Kim; Mi-Hyun Son; Soo-Yong Park; Chang-Seok Lee

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