Article
Nanoscience & Nanotechnology
Sunhyeong Lee, Jongwon Lee, Junyoung Lee, Jaeduk Lee, Hyunsang Hwang
Summary: In this study, the synergistic effect of microwave annealing (MWA) and high-pressure hydrogen annealing (HPHA) was utilized to effectively reduce grain boundary trap (GBT) density, resulting in improved field-effect mobility (mu) and subthreshold swing (SS) of poly-Si thin-film transistors (TFTs). The mechanism of SS and mobility enhancement was quantitatively understood by lowering the GB barrier height. Raman spectroscopy proved the improvement of poly-Si crystallinity during MWA. The results showed that MWA and HPHA play a vital role in reducing GBT density and improving poly-Si TFT characteristics.
Article
Physics, Applied
Peng Zhang, Yun Guo, Keyang Cao, Mingdong Yi, Liya Huang, Wei Shi, Jintao Zhu, Wei Huang
Summary: An organic nonvolatile memory based on ODTS SAM and F16CuPc has been proposed, with F16CuPc as the active layer and ODTS SAM as the charge trapping layer. By optimizing the structure, the retention time can be extended and a high WRER reading current ratio can be achieved for practical applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
Puhao Chai, Jun Zhu, Jiale Chen
Summary: A charge trapping memory with high-k nanocrystal-amorphous phase structure was fabricated. Numerous charge traps were generated at the phase interface, significantly increasing the charge trapping capability. The device demonstrated a larger memory window and excellent stability.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Mechanical
Yun Hu, Youquan Wang, Jiangjing Xi, Ao Chen, Kamran Nikbin
Summary: Grain, grain boundaries, voids, alloying elements and other anomalies have a significant impact on the stress distribution at the sub-grain meso level in additively manufactured alloys, affecting the strain controlled low cycle fatigue. This paper proposes an idealized grain/grain boundary model using Voronoi tessellation technique to quantify the effects of different features on the LCF performance.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Chemistry, Multidisciplinary
Ki-Woong Park, Won-Ju Cho
Summary: The research team proposes a novel ambipolar chitosan synaptic transistor that effectively responds to binary neuroplasticity. By applying a chitosan electric double layer to the gate insulator of the polycrystalline silicon thin-film transistor with Ni-silicide Schottky-barrier source/drain junction, the team successfully fabricates the synaptic transistors. These transistors exhibit artificial synaptic behavior in response to both positive and negative stimulation signals, providing versatile information processing capabilities for bio-inspired neuromorphic computing systems.
Article
Chemistry, Analytical
Daniel Drury, Keisuke Yazawa, Andriy Zakutayev, Brendan Hanrahan, Geoff Brennecka
Summary: Currently, there is a lack of nonvolatile memory (NVM) technology that can operate continuously at temperatures > 200 degrees C. This study demonstrates how AlScN can enable high-temperature (>200 degrees C) nonvolatile memory, showing promise for potential high-temperature operation.
Article
Chemistry, Physical
Xinxin Zhang, You Lv, Teruo Hashimoto, Jan-Olov Nilsson, Xiaorong Zhou
Summary: In this study, the influence of trace level Cu on intergranular corrosion in AA6082 alloy was investigated using accelerated corrosion testing and high resolution electron microscopy. It was found that Al2Cu precipitates promoted IGC at the grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Mechanical
Qinjia Wang, Yidong Wu, Jinbin Chen, Jinxia Song, Chengbo Xiao, Xidong Hui
Summary: This study demonstrates that B-induced improvement in low cycle fatigue (LCF) lifetime in single crystal superalloy turbine blades can be achieved by stabilising low angle grain boundaries (LAGB) through a delicate modulation of LAGB composition without using boride. The Binduced matrix softening featured by homogenous distribution of fatigue deform zones with high density of dislocations was also evidenced.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Physics, Multidisciplinary
Dongli Zhang, Mingxiang Wang, Huaisheng Wang
Summary: The negative gate bias stress (NBS) reliability of n-type polycrystalline silicon (poly-Si) thin-film transistors (TFTs) with a distinct defective grain boundary (GB) in the channel is investigated. The results show that the drain leakage current exhibits different gate bias dependence due to trap state generation in the GB region, positive-charge local formation in the gate oxide near the source and drain, and trap state introduction in the gate oxide.
Article
Engineering, Electrical & Electronic
Hao-Tung Chung, Chun-Ting Chen, Yi-Shao Li, Yu-Wei Liu, Chan-Yu Liao, Wen-Hsien Huang, Jia-Min Shieh, Jun-Dao Luo, Wei-Shuo Li, Kai-Chi Chuang, Kuan-Neng Chen, Huang-Chung Cheng
Summary: This study reports the fabrication of polycrystalline silicon tunneling field effect transistors using green nanosecond laser crystallization (GLC), achieving large grain size and high-quality poly-Si thin films. Comparing with devices fabricated by solid phase crystallization, the ones via GLC exhibit better subthreshold swing and higher on/off ratio, with the activation energy curve demonstrating the connection between device performance and crystallinity of poly-Si thin films.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Sunaina Priyadarshi, Abidur Rahaman, Mohammad Masum Billah, Sabiqun Nahar, Jin Jang
Summary: A compact DC-DC converter has been developed based on low-temperature poly-Si oxide thin film transistors. It shows good performance with reduced area and small pumping capacitors. Experimental results demonstrate that the converter achieves an output voltage of 14.5V and an output power of 790 μW for a 3V input voltage, with a maximum power efficiency of 83.3% at a load current of 90 μA.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
D. F. Shi, Z. J. Zhang, Y. H. Yang, Y. Z. Zhou, R. Liu, P. Zhang, Z. F. Zhang
Summary: Nickel-based single-crystal superalloys are widely used in manufacturing aeroengine turbine vanes due to their excellent high-temperature performance. However, the presence of low-angle grain boundaries (LAGBs) during their manufacture can weaken the mechanical properties of the superalloys. In this study, the relationship between grain boundary misorientation (GBM) and fatigue properties of superalloys at elevated temperatures was systematically investigated using six different bicrystals with varying tilt LAGBs. The study found that an increase in GBM led to an increase in GB precipitates and cast micropores, resulting in a decrease in fatigue life and fatigue strength. The study also established a quantitative fatigue strength prediction model and evaluated the coupling effect of cast micropores and GBM on the fatigue damage mechanisms of the bicrystals.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Biochemistry & Molecular Biology
Feng-Tso Chien, Jing Ye, Wei-Cheng Yen, Chii-Wen Chen, Cheng-Li Lin, Yao-Tsung Tsai
Summary: The study discussed how the electric field at the drain side of an RSD device can be reduced by adopting a vertical lightly doped drain (LDD) scheme instead of a pure raised source/drain structure. Different device structures were simulated to compare their impact on electric field and output characteristics, revealing that the vertical lightly doped drain RSD scheme can effectively reduce the drain electric field.
Article
Engineering, Electrical & Electronic
William Cheng-Yu Ma, Chun-Jung Su, Kuo-Hsing Kao, Yao-Jen Lee, Ju-Heng Lin, Pin-Hua Wu, Jui-Che Chang, Cheng-Lun Yen, Hsin-Chun Tseng, Hsu-Tang Liao, Yu-Wen Chou, Min-Yu Chiu, Yan-Qing Chen
Summary: This work demonstrates the construction of nonvolatile memory based on tunnel thin-film transistors and a ferroelectric HfZrOx layer. The memory exhibits sufficient electrical performance and can be integrated with smart wearable devices for edge computing applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Engineering, Electrical & Electronic
Akira Mizutani, Fuminobu Hamano, Daisuke Nakamura, Tetsuya Goto, Siti Rahmah Aid, Hiroshi Ikenoue
Summary: The study investigates the possibility of controlling grain sizes above 350 nm by laser annealing and explores the relationship between TFT characteristics and grain size. The results show that a high mobility can be achieved at a grain size of 2.5 μm. The study confirms the technical feasibility of producing LTPS with controlled grain sizes for customizing device characteristics.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2021)
