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Electron. Mater., Volume 5, Issue 3 (September 2024) – 2 articles

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13 pages, 6772 KiB  
Article
Alternative Measurement Approach for the Evaluation of Hot-Electron Degradation in p-GaN Gate AlGaN/GaN Power HEMTs
by Marcello Cioni, Giovanni Giorgino, Alessandro Chini, Antonino Parisi, Giacomo Cappellini, Cristina Miccoli, Maria Eloisa Castagna, Cristina Tringali and Ferdinando Iucolano
Electron. Mater. 2024, 5(3), 132-144; https://doi.org/10.3390/electronicmat5030009 - 23 Jul 2024
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Abstract
In this paper, a new method for evaluating hot-electron degradation in p-GaN gate AlGaN/GaN power HEMTs is proposed. The method exploits a commercial parameter analyzer to study VTH and RON drifts induced by on-state stress at VDS = 50 V. [...] Read more.
In this paper, a new method for evaluating hot-electron degradation in p-GaN gate AlGaN/GaN power HEMTs is proposed. The method exploits a commercial parameter analyzer to study VTH and RON drifts induced by on-state stress at VDS = 50 V. The results show that VTH drift and part of the RON degradation induced by the on-state stress are recoverable and likely due to the ionization of C-related acceptors in the buffer. This was confirmed by a preliminary characterization of C-related buffer traps. Conversely, the remaining part of RON degradation (not recovered in 1000 s) was strongly affected by the surface treatment. The current level set during on-state stress affected the amount of non-recoverable degradation, confirming the involvement of hot electrons. Thanks to the monitoring of the parameters’ recovery, the proposed method provides important insights into the physical mechanisms governing the parameters’ degradation. This extends the capabilities of state-of-the art systems, without the need for custom setup development. Full article
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31 pages, 7363 KiB  
Review
Recent Advances of Conductive Hydrogels for Flexible Electronics
by Jingyu Wang, Bao Yang, Zhenyu Jiang, Yiping Liu, Licheng Zhou, Zejia Liu and Liqun Tang
Electron. Mater. 2024, 5(3), 101-131; https://doi.org/10.3390/electronicmat5030008 - 22 Jun 2024
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Abstract
Conductive hydrogels combine the properties of both hydrogels and conductors, making them soft, flexible, and biocompatible. These properties enable them to conform to irregular surfaces, stretch and bend without losing their electrical conductivity, and interface with biological systems. Conductive hydrogels can be utilized [...] Read more.
Conductive hydrogels combine the properties of both hydrogels and conductors, making them soft, flexible, and biocompatible. These properties enable them to conform to irregular surfaces, stretch and bend without losing their electrical conductivity, and interface with biological systems. Conductive hydrogels can be utilized as conductive traces, electrodes, or as a matrix for flexible electronics. Exciting applications in sensors, tissue engineering, and human-machine interaction have been demonstrated worldwide. This review comprehensively covers the progress in this field, focusing on several main aspects: functional materials, performance improvement strategies, and wearable applications in human-related areas. Furthermore, the major approaches and challenges for improving their mechanical properties, conductivity, and long-term stability are systematically summarized. Full article
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