Article
Chemistry, Multidisciplinary
Brittany N. Smith, Hope Meikle, James L. Doherty, Shiheng Lu, Gianna Tutoni, Matthew L. Becker, Michael J. Therien, Aaron D. Franklin
Summary: Printed carbon nanotube thin-film transistors (CNT-TFTs) are promising for flexible electronics, but printing the gate dielectric layer is challenging. Ionic dielectrics show potential but their composition and stress effects are not well understood. This study investigates three different ionic dielectrics in fully printed CNT-TFTs and reveals trade-offs in performance and stability. CNC exhibits the best low-voltage operation, while ion gel and elastomer show better stability under bias and mechanical stress.
Article
Engineering, Electrical & Electronic
Keith Behrman, Zhihua Zhu, Tian Sun, Marco Cavallari, Hang Li, Kalpathy Sundaram, Juin Liou, Ioannis Kymissis
Summary: This study extensively examines the relationship between contact overlap, protective effect, electric field, and ESD resilience in bottom-gate bottom-contact pentacene organic field-effect transistor (OFET) devices. The research shows a significant increase in tolerance with negative contact overlaps, and a slight decrease with more positive overlaps. Careful consideration should be given to negative overlap lengths when designing OFET devices to balance decreased performance and increased ESD resilience.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Engineering, Electrical & Electronic
Koki Taguchi, Takafumi Uemura, Andreas Petritz, Naoko Namba, Mihoko Akiyama, Masahiro Sugiyama, Teppei Araki, Barbara Stadlober, Tsuyoshi Sekitani
Summary: Flexible electronics has opened up possibilities for the development of next-generation wearable and implantable healthcare devices. This study focuses on using a photoreactive insulating polymer to modulate the power consumption and operating speed of ultraflexible organic circuits. The results demonstrate that a nanoscale interfacial photochemical reaction can enable low power consumption and tunable operating speed in organic signal processing circuits.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Yonghyun Albert Kwon, Jihyun Kim, Sae Byeok Jo, Dong Gue Roe, Dongjoon Rhee, Younguk Song, Byoungwoo Kang, Dohun Kim, Jeongmin Kim, Dae Woo Kim, Moon Sung Kang, Joohoon Kang, Jeong Ho Cho
Summary: Arrays of thin-film transistors can be fabricated on a large scale using solution-based processing of Molybdenum Disulfide and Sodium-embedded Alumina inks. This method yields devices with high carrier mobility at room temperature. However, existing solution processing methods often have a trade-off between scalability and material quality.
NATURE ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Jingyu Park, Shinyoung Park, Jun Tae Jang, Sung-Jin Choi, Dong Myong Kim, Jong-Ho Bae, Hong Jae Shin, Yun Sik Jeong, Jong Uk Bae, Chang Ho Oh, Changwook Kim, Dae Hwan Kim
Summary: The linearity of the top-gate voltage-swept threshold voltage with back-gate voltage is essential in amorphous indium-gallium-zinc-oxide thin-film transistors. This study investigates the influence of positive bias stress on the linearity and explains the non-linearity based on excessive oxygen-related defect creation.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Kareem Mansour, Samar Elsaegh, Ute Zschieschang, Hagen Klauk, Ghada H. Ibrahim
Summary: A floating-gate (FG) cell is presented as a circuit-level approach to control the threshold voltage of organic thin-film transistors (TFTs) operated in the transdiode configuration. The concept demonstrates versatility by achieving systematic tuning of threshold voltage values and improved performance in rectifiers and inverters.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Yuanwei Zhu, Nan Qiao, Shuqi Dong, Guanghao Qu, Yu Chen, Wanlong Lu, Zongze Qin, Dongfan Li, Kangning Wu, Yongjie Nie, Bo Liu, Shengtao Li, Guanghao Lu
Summary: In this study, a series of fluorinated polystyrene isomers were designed through side-chain engineering. By enhancing molecular charge separation and electrostatic potential, the dielectric constant and charge trapping performance were improved, leading to enhanced photon memory and artificial synapse performance.
CHEMISTRY OF MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Chuan Yu Han, P. T. Lai, Wing Man Tang
Summary: High-performance pentacene organic thin-film transistors with Hf-0.13 La0.87O gate dielectric and Pd gate electrode show high carrier mobility on both Si and PI substrates, with good stability after exposure to air for 30 days without encapsulation.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yingshuang Zheng, Hongzhen Lin, Ting Jiang, Dongyang Zhu, Shengli Qi, Wei Li, Liqiang Li, Deyang Ji, Wenping Hu
Summary: The disordered chain arrangement of polymer dielectrics affects the system performance, making it difficult to achieve band-like transmission of vapor-deposited organic small molecule films (VDOSMFs). In this study, three types of bi-polymer dielectrics were developed to modulate charge transport from thermally activated mode to band-like transport at the interfacial level. The polyimide layer in the bottom plays a crucial role in interfacial modulation, selectively binding with the up-dielectric layers to control charge transport.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Siew Ting Melissa Tan, Gijun Lee, Ilaria Denti, Garrett LeCroy, Kalee Rozylowicz, Adam Marks, Sophie Griggs, Iain McCulloch, Alexander Giovannitti, Alberto Salleo
Summary: In this study, organic electrochemical transistors were chemically doped using simple solution-processing methods to tune the operation voltage range without affecting the channel properties. The chemical doping also improved the electrochemical stability of the polymer electrodes.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Ranjan Kumar Barik, Lilia M. Woods
Summary: This article introduces a computational dataset of bilayer materials, consisting of 760 structures with their structural, electronic, and transport properties. Different stacking patterns of each bilayer are determined by analyzing the symmetries of their monolayers. Density functional theory calculations, including van der Waals interactions, are performed to evaluate the ground states of each stacking pattern. The dataset can be utilized for materials screening and data-assisted modeling for desired thermoelectric or optoelectronic applications.
Article
Multidisciplinary Sciences
Mingxin Zhang, Cong Zhang, Yahan Yang, Hang Ren, Junmo Zhang, Xiaoli Zhao, Yanhong Tong, Qingxin Tang, Yichun Liu
Summary: This study introduces a novel low-temperature solution-processed PEI-EP polymer dielectric with enhanced stability and performance, which is successfully applied in ultraflexible organic transistors, exhibiting high stability, excellent electrical performance, and humidity resistance. This opens up a new avenue for the development of next-generation low-cost skin electronics.
Article
Engineering, Electrical & Electronic
Wenhao Wang, Gang He, Leini Wang, Xiaofen Xu, Yongchun Zhang
Summary: This study proposed the preparation of HfLaOx gate dielectric thin films by the spin coating method and investigated their physical properties. Optimized performance parameters with annealing temperature of 300 degrees C were achieved for superior electrical performance, showing potential applications in logic circuits.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Optics
Ting Jiang, Yiru Wang, Wanxin Huang, Haifeng Ling, Guofeng Tian, Yunfeng Deng, Yanhou Geng, Deyang Ji, Wenping Hu
Summary: This study introduces carboxyl groups into polymer dielectrics to achieve high device mobility and optical figures of merit at a low operating voltage. It also improves image sensing and memory capabilities.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Tengteng Lei, Runxiao Shi, Yuqi Wang, Zhihe Xia, Man Wong
Summary: In the absence of a mature p-type TFT technology, a unipolar n-type TFT technology with different threshold voltage values offers more flexibility. The dual-gate TFT is a viable and flexible approach that can operate in either the enhancement or depletion mode. A comparative study concludes that the multi-threshold voltage dual-gate TFT technology generally performs better.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Multidisciplinary
Zhi Jiang, Kenjiro Fukuda, Wenchao Huang, Sungjun Park, Roda Nur, Md Osman Goni Nayeem, Kilho Yu, Daishi Inoue, Masahiko Saito, Hiroki Kimura, Tomoyuki Yokota, Shinjiro Umezu, Daisuke Hashizume, Itaru Osaka, Kazuo Takimiya, Takao Someya
ADVANCED FUNCTIONAL MATERIALS
(2019)
Article
Nanoscience & Nanotechnology
Sunghoon Lee, Daisuke Sasaki, Dongmin Kim, Mami Mori, Tomoyuki Yokota, Hyunjae Lee, Sungjun Park, Kenjiro Fukuda, Masaki Sekino, Katsuhisa Matsuura, Tatsuya Shimizu, Takao Someya
NATURE NANOTECHNOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Hiroki Kimura, Kenjiro Fukuda, Hiroaki Jinno, Sungjun Park, Masahiko Saito, Itaru Osaka, Kazuo Takimiya, Shinjiro Umezu, Takao Someya
ADVANCED MATERIALS
(2019)
Article
Multidisciplinary Sciences
Zhi Jiang, Fanji Wang, Kenjiro Fukuda, Akchheta Karki, Wenchao Huang, Kilho Yu, Tomoyuki Yokota, Keisuke Tajima, Thuc-Quyen Nguyen, Takao Someya
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Review
Chemistry, Physical
Kenjiro Fukuda, Kilho Yu, Takao Someya
ADVANCED ENERGY MATERIALS
(2020)
Article
Chemistry, Physical
Ruiyuan Liu, Masahito Takakuwa, Ailong Li, Daishi Inoue, Daisuke Hashizume, Kilho Yu, Shinjiro Umezu, Kenjiro Fukuda, Takao Someya
ADVANCED ENERGY MATERIALS
(2020)
Article
Multidisciplinary Sciences
Fei Qin, Wen Wang, Lulu Sun, Xueshi Jiang, Lin Hu, Sixing Xiong, Tiefeng Liu, Xinyun Dong, Jing Li, Youyu Jiang, Jianhui Hou, Kenjiro Fukuda, Takao Someya, Yinhua Zhou
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Zhi Jiang, Kilho Yu, Haoyang Wang, Steven Rich, Tomoyuki Yokota, Kenjiro Fukuda, Takao Someya
Summary: An integrated flexible photodetector with FET and OPD modules achieves ultralow dark current density and ultrahigh detectivity, amplifying the photoplethysmogram signal intensity from the OPD module by a factor of approximately 10.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Review
Chemistry, Multidisciplinary
Tomoyuki Yokota, Kenjiro Fukuda, Takao Someya
Summary: Flexible image sensors are gaining attention as new imaging devices due to their lightness, softness, and bendability. They offer high-accuracy continuous biometric information measurement directly attached to curved surfaces like skin, with potential applications in wearable devices and home medical care. The individual components, performance evaluation parameters, and real-world measurement cases of these sensors in the biomedical field are discussed.
ADVANCED MATERIALS
(2021)
Article
Multidisciplinary Sciences
Hiroaki Jinno, Tomoyuki Yokota, Mari Koizumi, Wakako Yukita, Masahiko Saito, Itaru Osaka, Kenjiro Fukuda, Takao Someya
Summary: The integration of ultraflexible optical sensors with power sources faces challenges due to the insufficient air operational stability of polymer light-emitting diodes. However, by combining air-operation-stable polymer light-emitting diodes, organic solar cells, and organic photodetectors, a self-powered organic optical system for photoplethysmogram monitoring has been developed. This system demonstrates high linearity and stability, making it suitable for long-term health monitoring applications.
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Akihiro Maeda, Ruiyuan Liu, Kilho Yu, Shinyoung Lee, Kyohei Nakano, Masahito Takakuwa, Shipei Zhang, Keisuke Tajima, Kenjiro Fukuda, Shinjiro Umezu, Takao Someya
Summary: Recent progress in organic photovoltaics (OPVs) emphasizes the importance of laboratory-scale fabrication in ambient air using solution processes. However, the effect of the existence of both ambient air and light during the formation of a photoactive layer on the performance of fabricated devices has not been fully elucidated. It was found that photoactive layer formation in completely dark conditions enables air-processable OPVs with a high power conversion efficiency, highlighting the impact of light and air coexistence on device performance.
JOURNAL OF PHYSICS-MATERIALS
(2021)
Article
Biochemical Research Methods
Takashi Ohya, Haruki Ohtomo, Tetsutaro Kikuchi, Daisuke Sasaki, Yohei Kawamura, Katsuhisa Matsuura, Tatsuya Shimizu, Kenjiro Fukuda, Takao Someya, Shinjiro Umezu
Summary: Human induced pluripotent stem (iPS) cell-derived cardiomyocytes are widely used for in vitro pharmacological and pathological studies. A novel simultaneous measurement system using 500 nm-thick flexible electronic sheets was developed for contractile force and extracellular field potential assessment of iPS cell-derived cardiac cell sheet-tissues. It was confirmed that this system is applicable for pharmacological studies and assessments of excitation-contraction coupling-related parameters. Flexible electronics with cardiac tissue engineering provide an advanced platform for drug development and gaining new insight in pharmacological study of human cardiac function.
Review
Chemistry, Multidisciplinary
Steven I. Rich, Zhi Jiang, Kenjiro Fukuda, Takao Someya
Summary: With the advancement of the Internet of Things and wearable computing, electronics have become increasingly essential in daily life. Traditional electronics, with their rigid angular nature, have faced challenges in integrating with curved surfaces. In recent years, efforts have been made to fabricate electronics on curved surfaces, showing the potential of curved electronics.
MATERIALS HORIZONS
(2021)
Article
Materials Science, Multidisciplinary
Tsukuru Minamiki, Tsuyoshi Minami, Yi-Pu Chen, Taisei Mano, Yasunori Takeda, Kenjiro Fukuda, Shizuo Tokito
Summary: The integration of organic thin-film transistors and biosensors is promising for daily health management, with molecular recognition chemistry-based design crucial for obtaining accurate and reproducible sensing signals. These results offer guidelines for the development of effective healthcare tools.
COMMUNICATIONS MATERIALS
(2021)
Article
Robotics
Takashi Ohya, Kazuki Nakazono, Tetsutaro Kikuchi, Daisuke Sasaki, Katsuhisa Sakaguchi, Tatsuya Shimizu, Kenjiro Fukuda, Takao Someya, Shinjiro Umezu
ARTIFICIAL LIFE AND ROBOTICS
(2018)