Article
Materials Science, Multidisciplinary
Juhyung Seo, Teahyun Park, Hocheon Yoo
Summary: This study systematically investigates a solution processed zinc-tin-oxide film and obtains suitable turn-on voltage and uniform charge transport property. The film is applied to a complementary inverter logic and demonstrates excellent circuit performance.
ORGANIC ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Sunghoon Han, Changik Im, Youn Sang Kim, Changsoon Kim
Summary: Cation exchange is demonstrated as a novel solution-based method to obtain high-quality ternary metal oxide films with improved electrical properties. By replacing some Zn ions in binary metal oxide films with In or Sn ions in a solution, the resulting films show enhanced performance compared to the parent films.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Yong Gu Lee, Woon-Seop Choi
Summary: The electrical properties of Zinc-tin-oxide thin-film transistors (TFTs) are significantly improved by adding propylene monomethyl ether acetate (PGMEA) to the solution-processed ZTO formulation during a low-viscosity inkjet printing process. These improvements include higher mobility, better threshold voltage, and stable characteristics.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Wanyu Zeng, Zengchong Peng, Dong Lin, Anna A. Guliakova, Qun Zhang, Guodong Zhu
Summary: This study reports a dual-mode proximity sensor based on an oxide thin-film transistor(TFT) that utilizes a tungsten carrier suppresser to develop semiconducting materials and devices. The sensor performs well in flat panel display applications and can also sense the proximity and angle of approach of charged objects.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Kaiwen Li, Atsushi Shimizu, Xinyi He, Keisuke Ide, Kota Hanzawa, Kosuke Matsuzaki, Takayoshi Katase, Hidenori Hiramatsu, Hideo Hosono, Qun Zhang, Toshio Kamiya
Summary: In this study, the intrinsic physical properties of polycrystalline Zn3N2 thin films were investigated by suppressing donor impurities. It was found that grain boundary scattering significantly affected the mobility in this nondegenerate Zn3N2 thin film. The mobility of this film, reaching 340 cm(2) V-1 s(-1), was comparable to epitaxial thin films, indicating its potential as a transistor active layer material.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Youn Goo Kim, Ravindra Naik Bukke, Jiseob Lee, Jewel Kumer Saha, Jin Jang
Summary: This study reports the high performance of self-aligned (SA), amorphous zinc-tin-oxide (a-ZTO) coplanar thin-film transistor (TFT) by spray pyrolysis, with features such as low surface roughness and stable electrical characteristics.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Dongwook Kim, Hyeonju Lee, Bokyung Kim, Sungkeun Baang, Kadir Ejderha, Jin-Hyuk Bae, Jaehoon Park
Summary: The electrical performance of solution-processed oxide semiconductors is closely related to the atomic composition ratio, which affects the structural properties and electrical performance of oxide semiconductor thin-film transistors.
Article
Computer Science, Information Systems
Ye-Ji Han, Se Hyeong Lee, So-Young Bak, Tae-Hee Han, Sangwoo Kim, Moonsuk Yi
Summary: This study aimed to overcome the thermal limitation of conventional sol-gel processed ZTO TFTs by fabricating them at low annealing temperatures using a self-combustion method. The optimized device exhibited satisfactory performance, showcasing the potential of this new approach for TFT manufacturing.
Article
Chemistry, Physical
Hyeonju Lee, Xue Zhang, Bokyung Kim, Jin-Hyuk Bae, Jaehoon Park
Summary: In this study, the effects of iodine doping on the electrical properties of copper oxide (CuO) semiconductor films and TFT performance were investigated. Iodine doping showed improvements in Hall mobility, carrier concentration, and resistivity of solution-processed CuO semiconductors. Additionally, iodine doping enhanced the performance of CuO TFTs by inducing conduction channel formation by holes and reducing counterclockwise hysteresis in transfer characteristics.
Article
Engineering, Electrical & Electronic
Wengao Pan, Xiaoliang Zhou, Ying Li, Wenting Dong, Lei Lu, Shengdong Zhang
Summary: By modulating the annealing atmosphere, high performance In-free ZnSnO (ZTO) thin film transistor (TFT) was achieved, with the best performance observed in ZTO TFT dealt with vacuum condition.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Christophe Avis, Jin Jang
Summary: The impact of NF3 plasma treatment on the HfO2 gate insulator of a-SnOx TFTs was studied. The 10 s-treated TFT demonstrated the best stability, with significantly decreased density of states (DOS) and good HfO2/a-SnOx interface quality.
Article
Engineering, Electrical & Electronic
Do Hyung Kim, Kwang-Heum Lee, Seung Hee Lee, Junsung Kim, Junghoon Yang, Jingyu Kim, Seong-In Cho, Kwang Hwan Ji, Chi-Sun Hwang, Sang-Hee Ko Park
Summary: The thin-film transistor architecture introduced a trench between the source and drain electrode to enhance current flow, resulting in superior on-current performance and low turn-on voltage.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Manu Shaji, K. J. Saji, M. K. Jayaraj
Summary: A bottom gated thin film transistor H2S sensor based on zinc tin oxide was reported with a strong reduction characteristic. The sensor showed a high response value and a long response time to H2S at low concentrations.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Pinyu Chen, Dongyang Wang, Liang Luo, Jinqiu Meng, Zhaoqiong Zhou, Xiaojuan Dai, Ye Zou, Luxi Tan, Xiangfeng Shao, Chong-an Di, Chunyang Jia, Hao-Li Zhang, Zitong Liu
Summary: This study reports the use of self-doped conjugated polymers in flexible thin-film transistors (OTFTs), which enables high unipolar n-type charge mobility, as well as good operational/ambient stability and bending resistance. New conjugated polymers PNDI2T-NM17 and PNDI2T-NM50 with different self-doping groups are designed and synthesized. The results show that the self-doped PNDI2T-NM17-based flexible OTFTs exhibit high charge-carrier properties and stability due to the appropriate doping level and intermolecular interactions.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yeonsik Choi, Byunguk Kim, Dowwook Lee, Sooyeon Kang, Jungtae Kim, Jangho Bae, Hyeongtag Jeon
Summary: In this study, SnS2 thin films with different concentrations of zinc doping were successfully prepared using atomic layer deposition. As the doping concentration increased, the optical and electrical properties of the thin films exhibited significant changes, indicating their potential for optoelectronic applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Sun Geun Yoon, Huding Jin, Won Hyung Lee, Junghyup Han, Yong Hyun Cho, Youn Sang Kim
Summary: Water is one of the abundant and ubiquitous resources on earth, with studies of fluidic phenomena expanding to nanometric domains. Detailed studies in nanofluidic channels help understand ion transports and solid-liquid interfacial interactions.
Article
Nanoscience & Nanotechnology
Kyungho Kim, Jun-Woo Park, Donggun Lee, Yong Hyun Cho, Youn Sang Kim
Summary: Controlling carrier injection into trap states in an insulator by varying oxygen vacancies in the oxide semiconductor is crucial for shifting the turn-on voltage of MIOSM TFDs. By manipulating trap states in the insulator, finely tuned turn-on voltages of MIOSM TFDs can be achieved.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Eun Goo Lee, Yong Jun Gong, Sung-Eun Lee, Hyun-Jae Na, Changik Im, Heebae Kim, Youn Sang Kim
Summary: By incorporating polyaniline (PANI) into metal oxide matrix, the electrical characteristics and stability of metal oxide thin-film transistors (TFTs) can be significantly improved.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Won Hyung Lee, Sun Geun Yoon, Huding Jin, Jeeyoung Yoo, Junghyup Han, Yong Hyun Cho, Youn Sang Kim
Summary: This study discusses the change in electrical properties of electrodes caused by ion adsorption at the solid-liquid interface, and demonstrates a sophisticated Hall measurement system for quantitative analysis of electron density change. An enhanced EIS-structured device is designed to monitor ion dynamics in liquid electrolyte media, confirming ion concentration dependence and specificity.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Haeyeon Lee, Minho Jin, Hyun-Jae Na, Changik Im, Jae Hak Lee, Jiyeon Kim, Yong Jun Gong, Chan Lee, Eungkyu Lee, Youn Sang Kim
Summary: This study proposes a water-in-bisalt/polymer electrolyte-gated synaptic transistor treated with ultraviolet ozone, which exhibits multiple synaptic functions and improved long-term plasticity. Surface engineering plays a crucial role in enhancing ion transport efficiency, and the trap sites generated by UV light and active oxygen during UVO treatment contribute to capturing lithium cations for better device performance.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Junghyup Han, Sun Geun Yoon, Won Hyung Lee, Huding Jin, Yong Hyun Cho, Youn Sang Kim
Summary: The paper investigates the ion-charge carrier interaction at the electrolyte-semiconductor interface, elucidating an electricity generating mechanism from interfacial ionic diffusion controlled by self-assembled molecules. The effects can be modulated by chemical functionalization of the interface molecular layer and transition metal ion complexation.
Article
Chemistry, Multidisciplinary
Minho Jin, Haeyeon Lee, Changik Im, Hyun-Jae Na, Jae Hak Lee, Won Hyung Lee, Junghyup Han, Eungkyu Lee, Junwoo Park, Youn Sang Kim
Summary: This study introduces a fluoroalkylsilane self-assembled monolayer to achieve stable synaptic plasticity in Li+ electrolyte-gated transistors (EGTs) with high fidelity, linearity, and symmetry. Experimental and simulation results using EGTs treated with fluoroalkylsilane with 5 fluoroalkyl chains demonstrate its suitability as artificial synapses for neuromorphic computing.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Physics, Applied
Changik Im, Jiyeon Kim, Jae Hak Lee, Minho Jin, Haeyeon Lee, Jiho Lee, Jong Chan Shin, Chan Lee, Youn Sang Kim, Eungkyu Lee
Summary: Synaptic thin-film transistors (TFTs) have advantages in signal processing and information storage, but their analysis is limited by the RC circuit model. This study proposes a single-pulse-driven synaptic EPSC model that includes capacitive effects and synaptic window information, enabling the simulation of EPSC in different TFT operating conditions.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ji Soo Kim, Soon-Hyung Kwon, Youn Sang Kim
Summary: Several studies have shown that thermal annealing induces intermixing at the interfaces of solution-processed OLEDs and improves device performance. In this study, impedance spectroscopy (IS) analysis was used to examine the changes in charge carrier dynamics in a solution-processed bilayer OLED after thermal annealing. The results showed that the improved charge transport of the electron transporting layer (ETL) was responsible for the performance enhancement, while significant intermixing at temperatures above the ETL's T-g led to decreased current efficiency.
Article
Chemistry, Physical
Huding Jin, Won Hyung Lee, Yong Hyun Cho, Junghyup Han, Changik Im, Seungyeon Yu, Lianghui Li, Jaewon Lee, Zhenxing Yin, Youn Sang Kim
Summary: This study demonstrates a self-powered illuminating glucose sensor that utilizes electricity generated from water infiltration phenomenon. The sensor has high sensitivity and selectivity, and can detect a wide range of glucose concentrations. The electricity generation is attributed to the adsorption/desorption of ions at the solid-liquid interface, and it can successfully distinguish harmful glucose concentrations to the human body.
Article
Physics, Applied
Minho Jin, Haeyeon Lee, Jae Hak Lee, Daeyoung Han, Changik Im, Jiyeon Kim, Moongu Jeon, Eungkyu Lee, Youn Sang Kim
Summary: In this research, Li+ electrolyte-gated transistors (EGTs) integrated with PVDF-TrFE ferroelectric polymer as a channel-electrolyte interlayer were presented. The transport of Li+ ions at the channel-electrolyte interface was accelerated, and Li+ ions effectively penetrated the channel due to the polarized domains of PVDF-TrFE. The EGTs demonstrated synaptic characteristics and showed high linearity and stability over 100 cycles, making them suitable as artificial synapses with an inference accuracy of 89.13% for the CIFAR-10 dataset.
APPLIED PHYSICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Jae Hak Lee, Jiyeon Kim, Minho Jin, Hyun-Jae Na, Haeyeon Lee, Changik Im, Youn Sang Kim
Summary: Cu2O TFTs with improved field-effect mobility and low off-current were achieved by reducing CuO impurities and dissociative Cu defects through a combination of deposition and annealing conditions. Nitrogen and oxygen play crucial roles in promoting Cu2O phase formation and preventing CuO phase formation.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Review
Chemistry, Physical
Won Hyung Lee, Junwoo Park, Sun Geun Yoon, Huding Jin, Junghyup Han, Youn Sang Kim
Summary: Ionovoltaics is a breakthrough concept that utilizes ion dynamics and water motion to generate electrical energy. By studying the nanoscopic ionic behavior at the solid-liquid interface and the flow of electrons in a semiconductor electrode, ionovoltaic research aims to provide a rational mechanism for energy conversion by water motion and discuss the potential for transforming related fields through the development of enabling technologies. The development of high-efficiency ionovoltaic devices powered by small water droplets can contribute to green energy systems and address environmental pollution and energy shortages.
Article
Chemistry, Multidisciplinary
Jiho Lee, Jae Hak Lee, Chan Lee, Haeyeon Lee, Minho Jin, Jiyeon Kim, Jong Chan Shin, Eungkyu Lee, Youn Sang Kim
Summary: Machine learning, specifically Bayesian optimization, is applied to the design of dual-layer oxide semiconductor thin film transistors (OS TFTs), achieving remarkable electrical performance while reducing experimental trials. The optimized dual-layer OS TFTs show enhanced field effect mobility and stability under bias stress.
Article
Chemistry, Physical
Yong Hyun Cho, Huding Jin, Won Hyung Lee, Junghyup Han, Minho Jin, Seungyeon Yu, Lianghui Li, Sun Geun Yoon, Youn Sang Kim
Summary: The solid-liquid interfacial effect is crucial in the interaction between a solid surface and dynamic water motion, but the exact source of energy conversion and the fluidic processes with water and charge carrier movement are still not well understood. This study demonstrates the mechanism of water motion-induced energy generation at 2D nanomaterials through water contact-driven carrier density modulation and fermi energy level shift. Dynamic carrier motions are observed and supported by a metal electrode configuration, showing that the modulated electronic energy levels between wet and dry regions play a key role in electricity generation.
