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
Materials Science, Multidisciplinary
Bin Chen, Guanglei Liu, Minying Wu, Yudong Cao, Haibin Zhong, Jianfeng Shen, Mingxin Ye
Summary: Currently, there is a growing interest in the development of organohydrogel-based wearable flexible electronics (WFEs) due to their superior environmental stability compared to hydrogel-based WFEs. In this study, an efficient strategy is proposed to achieve the quick preparation of organohydrogels by utilizing the high reactivity of eutectic gallium-indium alloy and constructing a glycerol/water binary solvent system. The resulting organohydrogels, named liquid metal-based ion-conducting organohydrogels (LMIOs), demonstrate excellent environmental adaptability, high transparency, and remarkable mechanical properties and self-healing abilities, making them suitable for sensing human motions and applications in skin-attachable devices, robotics, and prosthetics.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Li Xiang, Huaidong Ye, Hui Wang, Yuwei Wang
Summary: In this work, carbon nanotube (CNT) thin film transistors (TFTs) with excellent conformability to biological surfaces were realized, demonstrating good electrical properties and flexibility even after being deformed. A flexible amplifier constructed based on the CNT TFTs exhibited low voltage supply and wide bandwidth, providing important capabilities for future advanced biological or clinical applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
Yan Wang, Yingjie Tang, Yitong Chen, Dingwei Li, Huihui Ren, Guolei Liu, Fanfan Li, Ran Jin, Bowen Zhu
Summary: Flexible thin-film transistors (TFTs) and arrays using co-sputtered indium gallium zinc oxide (IGZO) and indium tin oxide (ITO) as channels deposited at room temperature without post-annealing were achieved. The transistor switching properties were effectively improved by regulating the sputtering power of ITO. The TFTs exhibited robust mechanical flexibility, uniform performance, and high gain, making them suitable for advanced flexible displays and large-area integrated circuits.
FLEXIBLE AND PRINTED ELECTRONICS
(2023)
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
Kory Schlingman, Gloria M. D'Amaral, R. Stephen Carmichael, Tricia Breen Carmichael
Summary: Liquid metal-embedded elastomers (LMEEs) are deformable composites made of liquid metal particles dispersed in an elastomeric matrix. A simple process is introduced to fabricate intrinsically conductive LMEEs with conductive surfaces by sedimenting microparticles of eutectic gallium-indium alloy in the elastomer. These materials are soft, stretchable, and exhibit stable conductivity.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Electrical & Electronic
Shu-Ming Hsu, Dung-Yue Su, Feng-Yu Tsai, Jian-Zhang Chen, I-Chun Cheng
Summary: This article demonstrates a high-gain flexible complementary metal-oxide-semiconductor inverter, showcasing desirable features for device miniaturization while maintaining stability in flexible electronics applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Materials Science, Multidisciplinary
Ovidio Rodriguez-Lopez, Pedro E. Rocha-Flores, Jimin Maeng, Stuart F. Cogan, Joseph J. Pancrazio, Lakshman Tamil, Walter E. Voit, Gerardo Gutierrez-Heredia
Summary: This paper presents a circuit based on thin-film transistors, which enables high spatial resolution in neural stimulation electrode arrays. The circuit allows precise control of the electrode's On/Off states and current delivery, and exhibits high-frequency response, stability, and the ability to deliver biphasic stimulation pulses.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Review
Physics, Applied
Federica Catania, Hugo de Souza Oliveira, Pasindu Lugoda, Giuseppe Cantarella, Niko Munzenrieder
Summary: The development of new materials and advanced fabrication techniques has allowed electronics to transform from bulky rigid structures to unobtrusive soft systems, leading to the realization of new thin-film devices on unconventional substrates. These innovations have enabled the creation of smart structures for tasks beyond the capabilities of traditional electronics or substrates.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ashuya Takemoto, Teppei Araki, Kazuya Nishimura, Mihoko Akiyama, Takafumi Uemura, Kazuki Kiriyama, Johan M. Koot, Yuko Kasai, Naoko Kurihira, Shuto Osaki, Shin-ichi Wakida, Jaap M. J. den Toonder, Tsuyoshi Sekitani
Summary: Fully transparent, ultrathin, and flexible organic electrochemical transistors (OECTs) were successfully developed using the additive integration processes of selective-wetting deposition and thermally bonded lamination. These OECTs demonstrate high visible transmittance and high transconductance, with low-voltage operations. EEG acquisition and nitrate ion sensing can be performed while wearing the transparent OECTs, and simultaneous assessments of optical blood flowmetry are also compatible.
Article
Engineering, Electrical & Electronic
Wenjuan Zhou, Mingchen Zou, Mingxiang Wang, Dongli Zhang, Huaisheng Wang
Summary: This study investigates the effect of loading frequency on the degradation and failure behavior of flexible amorphous indium-gallium-zinc-oxide thin-film transistors (TFTs) under dynamic stretch stress. The results show a strong dependence of the TFTs on the loading frequency, which distinguishes it from previous observations on traditional materials.
IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY
(2023)
Article
Engineering, Electrical & Electronic
Sung-Hwan Choi
Summary: Amorphous indium-gallium-zinc oxide (IGZO) thin-film transistors (TFTs) have shown significant potential for application in transparent and flexible electronic devices. A novel TFT design with ITO S/D electrode layer and co-sputtered IGZO and ITO thin films has demonstrated superior electric characteristics compared to conventional ITO electrodes, due to lower contact and channel resistance and additional oxygen vacancies at the IGZO channel region. The proposed IGZO TFT with excellent electrical properties is expected to promote the application of TFTs in advanced displays.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Multidisciplinary Sciences
Seongmin Jeong, Jinhyeok Oh, Hongchan Kim, Joonbum Bae, Seung Hwan Ko
Summary: As the wearable heater becomes increasingly popular, there is a need to improve its tensile stability. However, maintaining stability and precise control of heating in these heaters remains challenging due to multiaxial dynamic deformation with human motion. In this study, a pattern study for a circuit control system was proposed, which showed the significance of input power per unit area for steady average temperature with tension. A wearable heater with minimal resistance change regardless of tension direction was developed using Peano curves and sinuous pattern structure, and it demonstrated stable heating in actual motion.
Article
Chemistry, Multidisciplinary
Xiaoguang Hu, Mengxi Wu, Lixuan Che, Jian Huang, Haoran Li, Zehan Liu, Ming Li, Dong Ye, Zhuoqing Yang, Xuewen Wang, Zhaoqian Xie, Junshan Liu
Summary: Flexible pressure sensors are becoming increasingly important in various applications such as human health monitoring, soft robotics, and human-machine interfaces. A conventional approach to achieving high sensitivity is by introducing microstructures to engineer the sensor's internal geometry. However, this strategy results in a thicker sensor which impairs conformability on surfaces with microscale roughness. In this manuscript, a nanoengineering strategy is introduced to resolve the conflicts between sensitivity and conformability, resulting in the thinnest resistive pressure sensor with superior sensitivity and conformability.
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
Chemistry, Multidisciplinary
Yusin Pak, Woojin Park, Somak Mitra, Assa Aravindh Sasikala Devi, Kalaivanan Loganathan, Yogeenth Kumaresan, Yonghun Kim, Byungjin Cho, Gun-Young Jung, Muhammad M. Hussain, Iman S. Roqan
Article
Chemistry, Analytical
Da Hoon Lee, Sun Kil Kang, Yusin Pak, Namsoo Lim, Ryeri Lee, Yogeenth Kumaresan, Sungeun Lee, Chaedeok Lee, Moon-Ho Ham, Gun Young Jung
SENSORS AND ACTUATORS B-CHEMICAL
(2018)
Article
Chemistry, Multidisciplinary
Namsoo Lim, Tae Jin Yoo, Jin Tae Kim, Yusin Pak, Yogeenth Kumaresan, Hyeonghun Kim, Woochul Kim, Byoung Hun Lee, Gun Young Jung
Article
Chemistry, Multidisciplinary
Yusin Pak, Yeonggyo Jeong, Naresh Alaal, Hyeonghun Kim, Jeonghoon Chae, Jung-Wook Min, Assa Aravindh Sasikala Devi, Somak Mitra, Da Hoon Lee, Yogeenth Kumaresan, Woojin Park, Tae-Wook Kim, Iman S. Roqan, Gun-Young Jung
ADVANCED MATERIALS INTERFACES
(2019)
Article
Chemistry, Multidisciplinary
Namsoo Lim, Yusin Pak, Jae-Keun Kim, Tae Jin Yoo, Hyeonghun Kim, Yogeenth Kumaresan, Woochul Kim, Seongjun Cho, Sooncheol Kwon, Byoung Hun Lee, Takhee Lee, Gun-Young Jung
Article
Nanoscience & Nanotechnology
Yogeenth Kumaresan, Hyeonghun Kim, Yusin Pak, Praveen Kumar Poola, Ryeri Lee, Namsoo Lim, Heung Cho Ko, Gun Young Jung, Ravinder Dahiya
ADVANCED ELECTRONIC MATERIALS
(2020)
Review
Nanoscience & Nanotechnology
Abhishek Singh Dahiya, Dhayalan Shakthivel, Yogeenth Kumaresan, Ayoub Zumeit, Adamos Christou, Ravinder Dahiya
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Sihang Ma, Ravinder Dahiya
Summary: The study introduces a new method based on a PMMA sacrificial layer, which can reduce the stress on UTCs and reliably separate them from the substrate. Compared to traditional methods, this approach offers high reliability and lower cost.
MICROELECTRONIC ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Yogeenth Kumaresan, Guanbo Min, Abhishek Singh Dahiya, Ammara Ejaz, Dhayalan Shakthivel, Ravinder Dahiya
Summary: A self-powered stretchable UV photodetector, developed with kirigami-inspired honeycomb-patterned zinc oxide nanowires and coupled with a triboelectric nanogenerator, demonstrates unprecedented stretchability and high performance. This innovative approach has great potential for real-time UV radiation monitoring using wearable healthcare technology.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Sihang Ma, Oliver Ozioko, Ravinder Dahiya
Summary: In this study, an innovative approach was proposed to achieve a highly sensitive capacitive pressure sensor by introducing a zinc oxide nanowire interlayer in the conventional metal-insulator-metal architecture. The zinc oxide nanowire interlayer significantly enhanced the performance of the sensor, resulting in a 7-fold increase in sensitivity at a low-pressure range. The improvement in sensitivity was attributed to enhanced charge separation and electric dipole generation due to the displacement of zinc and oxygen atoms under applied pressure.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Sihang Ma, Yogeenth Kumaresan, Abhishek Singh Dahiya, Leandro Lorenzelli, Ravinder S. Dahiya
Summary: This paper presents a flexible tactile sensing system based on ultrathin chips for dynamic contact pressure measurement. The system exhibits high sensitivity and has potential applications in minimal invasive surgical instruments.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Yogeenth Kumaresan, Oliver Ozioko, Ravinder Dahiya
Summary: This paper introduces a multifunctional electronic skin with a stack of pressure and temperature sensors arrays, achieving high sensitivity sensors under different pressure and temperature conditions through the development of pressure and temperature sensors using different materials and combinations. The developed e-Skin shows great potential for use in robotics and touch-based interactive systems.
IEEE SENSORS JOURNAL
(2021)
Article
Nanoscience & Nanotechnology
Sihang Ma, Yogeenth Kumaresan, Abhishek Singh Dahiya, Ravinder Dahiya
Summary: Heterogeneous integration is a promising approach for combining printed electronics and silicon technology in high-performance hybrid flexible electronics. A non-contact printing method is demonstrated here as an easy and cost-effective way to access UTCs on flexible foils. The research shows that a small increase in electrical resistance from printed interconnects can lead to an acceptable level of variation in device mobility of MOSFETs. The bonded UTCs exhibit robust device performance under bending conditions, indicating high reliability in both chip thinning and bonding methods.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Yusin Pak, Woojin Park, Naresh Alaal, Yogeenth Kumaresan, S. Assa Aravindh, Somak Mitra, Bin Xin, Jung-Wook Min, Hyeonghun Kim, Namsoo Lim, Byungjin Cho, Gun-Young Jung, Muhammad M. Hussain, Iman S. Roqan
ACS APPLIED ELECTRONIC MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Hyeonghun Kim, Woochul Kim, Jiyoon Park, Namsoo Lim, Ryeri Lee, Sung Jun Cho, Yogeenth Kumaresan, Myoung-Kyu Oh, Gun Young Jung