Article
Engineering, Electrical & Electronic
Fei Shan, Jae-Yun Lee, Hao-Zhou Sun, Han-Lin Zhao, Xiao-Lin Wang, Sung-Jin Kim
Summary: This study investigates a method for radio frequency oxygen plasma treatment of IZO films, showing that this posttreatment technology can improve the mobility and stability of IZO thin-film transistors. The process involves spin coating and thermal annealing to form the active layers, followed by O-2 plasma posttreatment to create a multistacked architecture triggered by O-2. The plasma-treated TFT devices exhibit improved electrical characteristics compared to untreated samples.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Wensi Cai, Haiyun Li, Zhigang Zang
Summary: The study showed that IZO films annealed at 350 degrees Celsius exhibit the best performance, and with the use of a thin AlxOy layer as the gate dielectric, high-performance IZO TFTs were demonstrated. These devices have a high current on/off ratio, high mobility, and are close to the theoretical limit of subthreshold swing.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Yan-Kui Liang, Jing-Wei Lin, Li-Chi Peng, Yi Miao Hua, Tsung-Te Chou, Chi-Chung Kei, Chun-Chieh Lu, Huai-Ying Huang, Sai Hooi Yeong, Yu-Ming Lin, Po-Tsun Liu, Edward-Yi Chang, Chun-Hsiung Lin
Summary: In this article, enhancement-mode thin-film transistors (TFTs) with ultrathin (approximately 3 nm) amorphous indium-zinc oxide (a-IZO) channel derived from atomic layer deposition (ALD) were demonstrated. The ALD-deposited IZO channel TFT showed improved device characteristics compared to thicker IZO channels. It exhibited high field-effect channel mobility, low subthreshold gate swing, high Ion/Ioff current ratio, and stable threshold voltages after positive and negative bias stress tests.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Weijie Ye, Yuan Liu, Bingqi Wang, Junkai Huang, Xiaoming Xiong, Wanling Deng
Summary: An improved model is developed to characterize the low-frequency noise (LFN) properties of amorphous indium-zinc-oxide thin-film transistors (a-IZO TFTs) in this article. The model considers both the oxide traps in the gate insulator and the discrete trap centers in the active-layer film, accurately describing the excess noise in the subthreshold and above-threshold regions. The model has been validated and successfully applied to a-IZO TFTs with different tail-state densities.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Jun-Rong Chen, Wen-Xing Xu, Wen-Cai Zuo, Xiang-Lin Mei, Lei Zhou, Miao Xu, Lei Wang, Wei-Jing Wu, Yu-Rong Liu, Jun-Biao Peng
Summary: This paper presents a high-gain operational amplifier (OPAMP) fabricated by unipolar n-type indium-zinc-oxide thin-film transistors using different positive feedback technologies to achieve sufficient voltage gain. The fabricated OPAMP exhibits a voltage gain of 50 dB over a -3 dB bandwidth of 15 kHz at a supply voltage of 20 V. Simulation results show that the proposed OPAMP has a voltage gain of 50 dB with a phase margin of 60 degrees at a unity-gain frequency of 150 kHz after compensation.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Kaizhen Han, Subhranu Samanta, Shengqiang Xu, Ying Wu, Xiao Gong
Summary: The study found that by reducing the equivalent oxide thickness, a temperature-independent mu(eff) can be achieved in the high field or high carrier concentration regime, while a strong temperature dependency is observed in the low field or low carrier concentration regime. Additionally, the relationship between EOT scaling and the gate bias voltage at which E-F equals to E-M was studied, revealing that α-IGZO TFTs can achieve high performance in low-power applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Materials Science, Multidisciplinary
Qi-Jun Sun, Jinxuan Wu, Meng Zhang, Yu Yuan, Xu Gao, Sui-Dong Wang, Zhenhua Tang, Chi-Ching Kuo, Yan Yan
Summary: This study investigates solution-processed indium gallium zinc oxide (IGZO) thin-film transistors (TFTs) with a bilayer structure by embedding an ultrathin layer of indium zinc oxide (IZO) between the gate dielectric and IGZO film. The optimized IGZO/IZO bilayer TFTs exhibit a high field-effect mobility and improved bias-stress stability compared to single-layer IGZO devices. In addition, the temperature-dependent mobility and V-T characteristics are studied to understand the trap distribution in the bilayer IGZO/IZO and single-layer IGZO TFTs. Moreover, low-voltage bilayer TFTs with high mobility are demonstrated.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Ritwik Vatsyayan, Shadi A. Dayeh
Summary: We present a new physics-based model for dual-gate a-IGZO TFTs, which was fine-tuned through experimental implementation and benchtop characterization. The model accurately captures the various operating regimes and characteristics of the TFTs, including ambipolar subthreshold currents, graded interbias-regime current changes, threshold and flat-band voltages, interface trap density, gate leakage currents, noise, and small signal parameters. We validated the model's performance by designing and fabricating a two-stage common source amplifier circuit, which exhibited excellent agreement between measured and simulated gain and phase performance over a wide frequency range.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Wei Zhong, Liangyun Kang, Sunbin Deng, Lei Lu, Ruohe Yao, Linfeng Lan, Hoi Sing Kwok, Rongsheng Chen
Summary: The study found that ITZO thin-film transistors with a scandium oxide (Sc2O3) passivation layer showed excellent electrical performance and stability, especially under negative bias temperature stress and positive bias temperature stress. In contrast, devices with an aluminum oxide (Al2O3) passivation layer exhibited poorer stability.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Engineering, Electrical & Electronic
Xiaoyu Lin, Qian Xin, Jaekyun Kim, Jidong Jin, Jiawei Zhang, Aimin Song
Summary: In this study, ultrathin AlxOy films used as gate dielectrics in thin-film transistors (TFTs) were prepared through an anodization process in aqueous and organic electrolytes. The effects of anodization electrolyte on the surface morphologies and electrical properties of AlxOy films were investigated through a series of anodization voltages. By using these anodized AlxOy films as gate dielectrics, 1-V indium-gallium-zinc-oxide (IGZO) TFTs were fabricated. The electrical characteristics of the IGZO TFTs with AlxOy films prepared in organic electrolyte showed enhancement compared to those with AlxOy films prepared in aqueous electrolyte, possibly due to the introduction of more carbon species in the anodized dielectric films. This work offers a method to further improve the properties of ultrathin anodized dielectrics and demonstrates the potential of using anodization for large-area low-power electronics in the future.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Biochemistry & Molecular Biology
Wangying Xu, Tao Peng, Shuangmu Zhuo, Qiubao Lin, Weicheng Huang, Yujia Li, Fang Xu, Chun Zhao, Deliang Zhu
Summary: Solution-grown phosphorus-doped indium oxide thin-film transistors (IPO TFTs) demonstrate promising characteristics such as high mobility and transparency, while effectively inhibiting oxygen-vacancy-related defects.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Jeongho Lee, Jidong Jin, Seohyun Maeng, Gisang Choi, Hayoung Kim, Jaekyun Kim
Summary: This study investigates the performance of indium tin zinc oxide (ITZO) thin-film transistors (TFTs) with different channel structures. The results show that bilayer-channel ITZO TFTs exhibit enhanced electrical performance and bias stress stability compared to single-channel ITZO TFTs. The electrical properties of the bilayer-channel films can be fine-tuned by adjusting their oxygen stoichiometry using an oxygen-compensated capping layer.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wangying Xu, Chuyu Xu, Liping Hong, Fang Xu, Chun Zhao, Yu Zhang, Ming Fang, Shun Han, Peijiang Cao, Youming Lu, Wenjun Liu, Deliang Zhu
Summary: In this study, we successfully grew ultra-thin In-Yb-O thin films using a vacuum-free aqueous solution method for the first time, and investigated the influence of Yb addition on the properties of In2O3. The results show that Yb dopant effectively suppresses oxygen vacancy defects, leading to improved electrical performance and stability of the thin-film transistors. The eco-friendly ultra-thin In-Yb-O films present a great opportunity for future electronic applications.
Article
Engineering, Electrical & Electronic
Hyunhee Kim, Taegyu Kim, Youngjin Kang, Seoung-Pil Jeon, Jiwan Kim, Jaehyun Kim, Sung Kyu Park, Yong-Hoon Kim
Summary: Researchers have successfully demonstrated sub-volt operating metal-oxide thin-film transistors using high-k gadolinium-doped hafnium oxide films. The Gd doping significantly improved the leakage current characteristics compared to undoped HfO2 films, making the high-k HGO film a promising candidate for low-power consumption sub-volt operating TFTs.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Xuyang Li, Bin Liu, Xianwen Liu, Guobin Sun, Haifeng Liang, Huan Liu, Qian Mi, Guangcai Yuan, Jianshe Xue, Zhinong Yu
Summary: A novel low-temperature solution-processed route using NH3 or N-2 plasma instead of thermal annealing was proposed for the fabrication of metal oxide thin films. NH3 PASP achieved acceptable electrical characteristics at 160°C, while causing apparent plasma damage on the film surface. On the other hand, N-2 PASP showed better low-temperature activation effect without plasma damage.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Physical
Qiufan Wang, Jiaheng Liu, Xuan Ran, Daohong Zhang, Guozhen Shen, Menghe Miao
Summary: In this study, a lightweight and flexible self-powered sensing system was developed by integrating a highly stretchable strain sensor with a high-performance asymmetric supercapacitor. The system utilizes ZnSe/CoSe2 nanosheets and ECNT to provide efficient transmission and short paths for electron/ion diffusion, achieving accurate measurement of strain and pressure changes.
Article
Engineering, Manufacturing
Hongbo Wang, Chongyang Tang, Bo Sun, Jiangchao Liu, Yan Xia, Wenqing Li, Changzhong Jiang, Dong He, Xiangheng Xiao
Summary: In CO2 electroreduction, the surface reconstructed Bi/Bi2O3 two-dimensional nanosheets were found to be the active phase, exhibiting excellent catalytic performance and long-term stability, resulting in the high Faraday efficiency of formate production.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2022)
Article
Chemistry, Multidisciplinary
Sabrina M. Younan, Zhida Li, XingXu Yan, Dong He, Wenhui Hu, Nino Demetrashvili, Gabriella Trulson, Audrey Washington, Xiangheng Xiao, Xiaoqing Pan, Jier Huang, Jing Gu
Summary: Active sites within catalysts play a crucial role in driving reactions and catalysis. By spatially confining guest metals in the microenvironments of active sites, the catalytic activity can be improved by modifying the electronic states of the active sites. In this study, the intercalation of zinc single atoms between layers of 1T-MoS2 enhances the performance of the hydrogen evolution reaction (HER) by reducing overpotential, charge transfer resistance, and kinetic barrier. This enhancement is achieved by controlling the coordination geometry and electronic states of the confined zinc atoms, which donate electrons to coordinated sulfur atoms and improve HER kinetics.
Article
Chemistry, Multidisciplinary
Zunjian Ke, Dong He, Xingxu Yan, Wenhui Hu, Nicholas Williams, Hongxing Kang, Xiaoqing Pan, Jier Huang, Jing Gu, Xiangheng Xiao
Summary: Nitrate and nitrite are common contaminants in industrial wastewater and groundwater. The electroreduction of NOx- to produce ammonia presents a sustainable alternative to the energy-intensive Haber-Bosch process. However, the development of selective catalysts that can regulate the reaction pathway and suppress competing reactions is still lacking.
Article
Chemistry, Multidisciplinary
Aohan Mei, Wen Chen, Zifan Yang, Min Zhou, Wei Jin, Shuang Yang, Keqiang Chen, Yueli Liu
Summary: Recently, a flexible COF-5 film was synthesized for wearable detection of human body humidity. The adsorption and desorption of water molecule in COF layers cause a reversible deformation and create conductive paths through pi-pi stacking. The COF-5 films exhibited a resistance change of 4 orders of magnitude in the range of 11%-98% relative humidity, showing promising prospects in applications such as respiratory monitoring and non-contact switch.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Physics, Applied
Yudong Sun, Jing Wang, Dong He, Menghua Yang, Changzhong Jiang, Wenqing Li, Xiangheng Xiao
Summary: In this article, a memristive device with a Cu/HfO2/TiO2 nanowire array/FTO structure was fabricated using a hydrothermal method and atomic layer deposition. The devices exhibited good resistive switching properties, including low set voltages (around 1V), good retention (>10^4s), and multilevel storage. Compared to Cu/TiO2 NWA/FTO devices, Cu/HfO2/TiO2 NWA/FTO devices showed better uniformity, possibly due to the difference in dielectric constants between TiO2 and HfO2. Under consecutive voltage pulses, some synaptic functions were mimicked, including long-term potentiation/depression, paired-pulse facilitation, and spike timing dependent plasticity.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Jing Wang, Hang Xu, Dong He, Hongbo Wang, Yufan Kang, Yongfeng Pei, Changzhong Jiang, Wenqing Li, Xiangheng Xiao
Summary: The authors propose to engineer 2D GeSe nanosheets via low-energy ion irradiation for improving the photoresponse and realize a self-driven and higher photoresponsivity by Ag ion irradiation. This work provides a new direction for modification of other 2D materials by ion beam technique for optoelectronic devices.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Yueli Liu, Yifan Huang, Zifan Yang, Yipeng Li, Jie Xu, Huizhong Li, Wen Chen, Keqiang Chen
Summary: Lead-free Cs2AgBiI6 nanocrystals with a hexagonal phase were successfully synthesized using a hot-injection process, showing great potential in optoelectronics. These nanocrystals have a band gap of 2.29 eV, a high absorption coefficient (around 2.8 x 105 cm-1), and a symmetric and narrow photoluminescence peak (FWHM = 10 nm). Moreover, the hexagonal Cs2AgBiI6 nanocrystal films exhibit excellent heat, humidity, and illumination resistance in air. Solar cells based on these nanocrystals achieved a power conversion efficiency (PCE) of 0.076%, demonstrating their promising application in photovoltaics.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Haoyu Li, Jing Wang, Yongfeng Pei, Yufan Kang, Changzhong Jiang, Wenqing Li, Xiangheng Xiao
Summary: Nonvolatile flash memory is widely used in portable electronic equipment, but its reliability and performance degrade as it approaches its physical limit. This study introduces a MoS2-based Ag nanocrystal memory that can be fabricated in one step through metal ion implantation. The fabricated memory has a 9 V window and a high ON/OFF current ratio (>10(7)), and exhibits good endurance characteristics. The ion implantation technology and the 2D nature of the channel can be utilized for large-scale integration of flexible nanoelectronic memory devices.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Jincan Ren, Yu Tang, Weibao Li, Dong He, He Zhu, Xingyu Wang, Si Lan, Zijia Yin, Tingting Yang, Zhaowen Bai, Yang Ren, Xiangheng Xiao, Qi Liu
Summary: A synergetic strategy of La, Mg co-doping and LiAlO2@Al2O3 surface coating is designed to enhance the performance of LiCoO2 (CM-LCO) cathode material under extreme temperatures. CM-LCO exhibits excellent temperature adaptability and remarkable electrochemical performance, as well as excellent cycle stability and high-rate performance. The synergistic effects of this co-modification strategy are demonstrated by investigating the electrochemical reaction kinetics and structure evolution of CM-LCO, providing a promising strategy for the application of high-voltage LCO in a wide temperature range.
Article
Chemistry, Multidisciplinary
Keqiang Chen, Zixin Gu, Zhiqing Wang, Mengyu Guan, Xiu Tan, Wanqing Xu, Xinyu Ji, Weiqi Lu, Yueli Liu, Guogang Li
Summary: Recently, the polarization effect has gained much attention for its role in improving stability and charge transfer efficiency in metal-halide perovskites. However, achieving the polarization effect in CsPbX3 NCs remains a challenge. In this study, small radius metal ions (such as Mg2+, Li+, Ni2+, etc.) were introduced on the surface of CsPbX3 NCs, promoting the generation of electric dipoles and surface polarization. This surface polarization effect led to enhanced surface ligand bonding, reduced surface defects, near unity photoluminescence quantum yields, and improved stability. Additionally, the introduction of hydroiodic acid enabled the in situ formation of tert-butyl iodide (TBI), facilitating the synthesis of pure iodine-based CsPbI3 NCs with high photoluminescence quantum yield and stability under ambient conditions.
Review
Chemistry, Multidisciplinary
Yafei Yang, Dong He, Xiaobo Feng, Xiangheng Xiao
Summary: Covalent organic framework (COF) materials have attracted great interest in photocatalytic applications due to their adjustable pore structure and photoelectric properties. However, the weak surface electron coupling and transfer ability limit the activity of pure COFs photocatalysts. To address this issue, a confinement modification strategy has been proposed to introduce low-dimensional entities into COFs, creating new active sites and regulating the band structure. This paper discusses the semiconductor properties of COFs based on photocatalytic thermodynamics and explores the influence of internal linkage motifs and stacking behaviors on the band structure. The confinement characteristics and their impact on photocatalytic performance are explained based on the spatial dimension classification of low-dimensional entities. Finally, the application and mechanism of COF-based confined catalysts in energy conversion reactions are discussed, along with the current challenges and development prospects of COF-based confined hetero-photocatalysts.
Article
Chemistry, Physical
Hange Wang, Wen Chen, Wei Jin, Yueli Liu
Summary: Sn-doped modified CoAl-LDH carriers synthesized by hydrothermal method achieve 100% NO conversion at a wide temperature range, demonstrating excellent resistance to SO2 pollution and low-temperature performance compared to other catalysts.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Hang Xu, Shuyao Si, Yipeng Li, Xiangbing Liu, Wenqing Li, Changzhong Jiang, Shijun Zhao, Hui Wang, Xiangheng Xiao
Summary: The radiation response of Nb-containing FeCrAl alloys under heavy ion radiation has been studied, showing excellent performance and the critical role of Laves phase in capturing radiation defects. The stability of Laves phase in radiation environment has been analyzed.
FUNDAMENTAL RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Chongyang Tang, Dong He, Nan Zhang, Xianyin Song, Shuangfeng Jia, Zunjian Ke, Jiangchao Liu, Jianbo Wang, Changzhong Jiang, Ziyu Wang, Xiaoqing Huang, Xiangheng Xiao
Summary: Engineering the electronic structure of surface active sites at the atomic level can efficiently modulate catalyst reactivity. By anchoring atomically dispersed metal atoms on FePS3 nanosheets, a strong electronic coupling effect is achieved, facilitating electron aggregation and enhancing electron-transfer for improved oxygen and water adsorption processes, leading to enhanced oxygen evolution and hydrogen evolution reactions. The concept of electronic coupling interaction provides a new method for catalyst design and beyond, demonstrating outstanding electrochemical water-splitting activities in the study.
ENERGY & ENVIRONMENTAL MATERIALS
(2022)
