Review
Polymer Science
Yan Wang, Junyao Zhang, Shiqi Zhang, Jia Huang
Summary: This review focuses on the fabrication methods of ultrathin OSC films and their applications in sensors, emphasizing the enhanced sensing performance of ultrathin organic semiconductor film devices. It also gives an overall outlook on the future development prospects and challenges.
POLYMER INTERNATIONAL
(2021)
Review
Chemistry, Multidisciplinary
Lukasz Janasz, Michal Borkowski, Paul W. M. Blom, Tomasz Marszalek, Wojciech Pisula
Summary: Organic semiconductors face limitations in their practical applicability due to low environmental stability and poor charge carrier mobilities. Blending with thermoplastic polymers and elastomers can overcome these restrictions and induce new material properties, showcasing great potential for flexible and stretchable electronics. Improved device properties such as charge carrier mobility, life-time, sensing ability, and mechanical behavior are achieved through blending with insulators, offering promise for various electronic devices and semiconductor classes.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Review
Chemistry, Multidisciplinary
Zhengqi Shen, Wei Huang, Li Li, Huizi Li, Jia Huang, Jiangong Cheng, Yanyan Fu
Summary: Due to their high sensitivity and selectivity, chemical sensors have gained significant attention in various fields. Among them, organic field-effect transistor (OFET) based chemical sensors have emerged as a promising alternative to traditional sensors. This review paper presents recent research progress on OFET-based chemical sensors, highlighting the enhancement of sensor performance. The main improvement programs include improving the internal and external structures of the device, as well as the organic semiconductor layer and dielectric structure. An outlook on the prospects and challenges of OFET-based chemical sensors is also provided.
Article
Chemistry, Analytical
Thomas Farrow, Siriny Laumier, Ian Sandall, Harm van Zalinge
Summary: This study reports the feasibility of using a flexible sensing system, based on a silicon field-effect transistor, to rapidly and accurately detect biomarkers associated with COVID-19. The system is easily adaptable to new and existing diseases, and exhibits low cost and linear response characteristics.
Article
Chemistry, Multidisciplinary
Dekai Ye, Juan Wang, Hongguang Shen, Xinping Feng, Lanyi Xiang, Wenlong Jin, Wenrui Zhao, Jiamin Ding, Zihan He, Ye Zou, Qing Meng, Wei Cui, Fengjiao Zhang, Chong-an Di, Chunhai Fan, Daoben Zhu
Summary: The study introduces an organic transistor with the ability to evaluate DNA damage, providing a highly sensitive response to gene damage even at very low concentrations. The transistor shows potential for wide application in high-throughput biotoxicity evaluation and drug screening.
ADVANCED MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Askold A. Trul, Victoria P. Chekusova, Daniil S. Anisimov, Oleg V. Borshchev, Marina S. Polinskaya, Elena V. Agina, Sergey A. Ponomarenko
Summary: This study investigates the electrical and sensing properties of ultrathin OFETs based on BTBT dimers with different aliphatic spacer lengths, fabricated by Langmuir-Blodgett, Langmuir-Schaefer, or spin-coating techniques. By optimizing the interface dielectric layer, uniform low-defect ultrathin semiconducting layers are obtained, resulting in improved electrical performance. The highest field-effect mobility of 0.47 cm(2) V-1 s(-1) is achieved for devices fabricated by LS method on top of a poly(methyl methacrylate) interface layer. The promising operational stability leads to advanced sensory properties, with a record limit of detection of 30 ppb for sensing ethanethiol in humid air.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Analytical
Chunsheng Wu, Ping Zhu, Yage Liu, Liping Du, Ping Wang
Summary: Biological chemical sensing systems, such as olfactory and taste systems, have evolved over millions of years to become highly powerful in detecting and discriminating various chemical substances. Developing field-effect sensors using biomaterials for chemical sensing has broad applications but is also challenging. Recent advances in this area have shown promising prospects and potential applications, although there are still limitations and challenges to address in the future.
Article
Chemistry, Multidisciplinary
Yazhou Wang, Anil Koklu, Yizhou Zhong, Tianrui Chang, Keying Guo, Chao Zhao, Tania Cecilia Hidalgo Castillo, Zhonggao Bu, Chengyi Xiao, Wan Yue, Wei Ma, Sahika Inal
Summary: This study demonstrates the synthesis of lactone-based n-type conjugated polymers using green aldol polymerization, which exhibit high performance in organic electrochemical transistors (OECTs) with high mobility-capacitance product, excellent mobility, low threshold voltage, and fast switching speed. The study also shows the applications of this n-type OECT in artificial synapse and detection of α-synuclein, a potential biomarker of Parkinson's disease. The research provides diverse form factors of devices for exploration in other application areas.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lijuan Zhang, Xinzi Tian, Yantao Sun, Jiarong Yao, Shuyuan Yang, Zheyuan Liu, Zhen Ge, Hongtao Zhang, Yan Sun, Xiangfeng Shao, Rongjin Li, Wenping Hu
Summary: The study demonstrates that controlling molecular configuration is an effective strategy to tune the bandgaps of organic semiconductors (OSCs) for designing OSCs insensitive to visible and near-infrared (VNIR) light, achieving high stability in organic field-effect transistors (OFETs).
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Remy Jouclas, Jie Liu, Martina Volpi, Lygia Silva de Moraes, Guillaume Garbay, Nemo McIntosh, Marco Bardini, Vincent Lemaur, Alexandre Vercouter, Christos Gatsios, Federico Modesti, Nicholas Turetta, David Beljonne, Jerome Cornil, Alan R. Kennedy, Norbert Koch, Peter Erk, Paolo Samori, Guillaume Schweicher, Yves H. Geerts
Summary: The charge transport of crystalline organic semiconductors is limited by dynamic disorder that tends to localize charges. This study proposes an innovative design that combines a chemical structure based on sulfur-rich thienoacene with a solid-state herringbone (HB) packing to overcome this limitation. Two new thienoacenes are synthesized and characterized, and their charge transport properties are investigated. The results show promising device performances and pave the way for the design of high-performing materials based on this new thienoacene.
Article
Engineering, Electrical & Electronic
Connor P. Sherwood, Daniel C. Elkington, Michael R. Dickinson, Warwick J. Belcher, Paul C. Dastoor, Krishna Feron, Alan M. Brichta, Rebecca Lim, Matthew J. Griffith
Summary: The research demonstrates the potential application of using organic semiconductor devices as photocapacitors in neural interface technologies. By characterizing different device architectures and conducting related tests, the study explores the photoresponse mechanism, advantages, and limitations of these devices.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Review
Materials Science, Multidisciplinary
Yui Sasaki, Tsuyoshi Minami
Summary: This article reviews the methodologies and actual approaches to maximizing the potential of organic field-effect transistors (OFETs) as chemical sensor platforms through fusion technologies between organic electronics and molecular-recognition chemistry. Functionalized extended-gate-type OFETs have achieved real-sample analysis, indicating the acceleration of the establishment of practical chemical sensor devices through the interdisciplinary field of organic electronics and molecular-recognition chemistry.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Wanlong Lu, Jingning Cao, Chenyang Zhai, Laju Bu, Guanghao Lu, Yuanwei Zhu
Summary: This study investigated the influence of a novel soluble molecular dopant, CN6-CP, on the performance optimization of OFETs. The results showed that doping with CN6-CP significantly improved the field-effect mobility of OFETs and enabled wide tunability of the threshold voltage, demonstrating great potential for organic electronic applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Arulmozhi Velusamy, Chih-Hsin Yu, Shakil N. Afraj, Chia-Chi Lin, Wei-Yu Lo, Chia-Jung Yeh, Ya-Wen Wu, Hsin-Chun Hsieh, Jianhua Chen, Gene-Hsiang Lee, Shih-Huang Tung, Cheng-Liang Liu, Ming-Chou Chen, Antonio Facchetti
Summary: A novel family of quinoidal thienoisoindigo (TII)-containing small molecules with dicyanomethylene end-capping units and different alkyl chains were synthesized for n-type organic small molecules in solution-processable organic field effect transistors (OFETs). The detailed molecular structure, properties, and performance of the 2-hexyldecyl substituted derivative, TIIQ-b16, were systematically studied, revealing its potential as electron transporting semiconductors with enhanced ambient stability. The results suggest that constructing quinoidal molecules from TII moiety is an effective approach to improve n-type charge transport characteristics.
Article
Biophysics
Jingwei Tao, Wenbo Sun, Lehui Lu
Summary: Biosensors based on organic field-effect transistors are advanced detection and monitoring devices with the ability to amplify signals. They have advantages such as high sensitivity, fast analysis speed, and simple operation, and have been widely used in the detection of DNA, protein, cell, glucose, and other biological substances.
BIOSENSORS & BIOELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Gunhoo Woo, Dong Hyun Lee, Yeri Heo, Eungchul Kim, Sungmin On, Taesung Kim, Hocheon Yoo
Summary: By using an octadecylphosphonic acid (ODPA) self-assembled-monolayer-based doping treatment, the proposed indium-gallium-zinc oxide (IGZO)/p-Si heterointerface devices show significantly enhanced photoresponsive characteristics, with a 100-fold increase in photoswitching current ratio, and a 15-fold increase in photoresponsivity and detectivity each. The observed effects of ODPA doping are thoroughly analyzed through X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and Kelvin probe force microscopy (KPFM). The fabricated photodetectors, at a 4-inch wafer scale, demonstrate excellent operational robustness, maintaining consistent performance over 237 days and 20,000 testing cycles.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Taehyun Park, Daekwan Kim, Bongguen Shin, Jaehyun Hur, Hocheon Yoo
Summary: A rapid and efficient opto-electrical method for determining blood components using a tin oxide quantum dot fluorene copolymer heterojunction photodetector is demonstrated. The device shows remarkable responsivity, detectability, fast responses, and stability under self-powered operation. This technique provides a simple and efficient approach for emergency medical care and health monitoring systems.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yunchae Jeon, Donghyun Lee, Hocheon Yoo
Summary: Thin-film transistors using metal oxides have been extensively studied for their high transparency, large area, and mass production capabilities. They are compatible with conventional semiconductor processes and can be used in flexible/stretchable devices, integrated circuits, biosensors, and neuromorphic devices. Recent efforts have focused on developing metal oxide-based thin-film transistors with high compatibility for integration into newly reported applications.
Article
Multidisciplinary Sciences
Junhwan Choi, Changhyeon Lee, Chungryeol Lee, Hongkeun Park, Seung Min Lee, Chang-Hyun Kim, Hocheon Yoo, Sung Gap Im
Summary: Researchers have developed a multi-valued logic circuit based on heterojunction transistors, which utilizes nonvolatile floating-gate flash memory to control channel conductance and achieve stable operation of ternary logic inverters. The 3D inverters, fabricated in a vertically stacked form, demonstrate high-density integration and device uniformity. The organic flash memory exhibits long retention characteristics, ensuring long-term stability of the 3D inverters. This study provides valuable insights for achieving high-performance multi-valued logic circuits.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Heekyeong Park, Junhwan Choi, Junoh Shim, Seung Min Lee, Sungmin On, Hyung Joong Yun, Sunkook Kim, Sung Gap Im, Hocheon Yoo
Summary: Nanoporous patterning of two-dimensional materials using block copolymer lithography has attracted much attention due to its ability to modify the electrical and optical properties of the materials. In this study, a reliable method using polymer thin films was proposed to passivate nanoporous MoS2 TFTs and improve their electrical stability. Functional polymer films were used as passivation layers, with an electron-donating polymer inducing n-type doping and an inert polymer stabilizing the electrical characteristics. The hydrophobic nature of the polymer film efficiently prevented adsorption of oxygen and moisture. Gate-bias stress tests and long-term storage tests confirmed the superior passivation effect of the inert polymer layer.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Review
Chemistry, Analytical
Juhyung Seo, Yeong Jae Kim, Hocheon Yoo
Summary: Zero-biased photodetectors have desirable characteristics including high efficiency, rapid response, and low power operation. By changing the electrode contact geometry or morphological structure of materials, the detector efficiency can be improved, and different combinations of materials can enable or disable selective light detection.
Review
Chemistry, Analytical
Somi Kim, Hochen Yoo, Jaeyoung Choi
Summary: Hysteresis in organic field-effect transistors is caused by bias stress effects, which result in variations in the drain-source current when sweeping the gate voltage. Charge trapping, commonly found in interface states or semiconductors, is one of the main factors contributing to hysteresis. Despite extensive research, accurately measuring and characterizing charge traps remains challenging, and their impact on the hysteresis of organic transistors is still largely unknown. In this study, we conduct a literature survey on hysteresis caused by charge traps, analyzing the driving principle of organic transistors, different types of hysteresis, charge trap characteristics, estimation models, and their dynamics, as well as using causal inference methods for quantitative analysis of the relationship between hysteresis and traps.
Review
Polymer Science
Junhwan Choi, Hocheon Yoo
Summary: This paper reviews recent progress in 2D semiconductor field-effect transistors (FETs) using a wide range of polymeric gate dielectric materials. By exploiting appropriate materials and processes, polymer gate dielectrics have enhanced the performance of 2D semiconductor FETs and enabled the development of versatile device structures in energy-efficient ways. In addition, this review highlights the applications of FET-based functional electronic devices in flash memory devices, photodetectors, ferroelectric memory devices, and flexible electronics. Challenges and opportunities for developing high-performance FETs based on 2D semiconductors and polymer gate dielectrics and realizing their practical applications are also outlined.
Review
Chemistry, Analytical
Ratul Kumar Baruah, Hocheon Yoo, Eun Kwang Lee
Summary: Flexible electronic devices rely on metal interconnects to enable electrical signal flow between components. The design of such interconnects must consider factors such as conductivity, flexibility, reliability, and cost. This article provides an overview of recent developments in flexible electronic devices using different metal interconnect approaches, focusing on materials and structural aspects. Additionally, emerging applications such as e-textiles and flexible batteries are discussed as important considerations.
Review
Chemistry, Multidisciplinary
Jihyun Shin, Hocheon Yoo
Summary: Unlike the photoelectric effect, the photogating effect enables the detection of sub-bandgap rays. This effect is caused by trapped photo-induced charges that alter the potential energy at the semiconductor/dielectric interface, resulting in a shift in the threshold voltage. The photogating effect separates the drain current in dark and bright exposures.
Article
Chemistry, Analytical
Youngmin Han, Dong Hyun Lee, Eou-Sik Cho, Sang Jik Kwon, Hocheon Yoo
Summary: Oxygen vacancies play a crucial role in determining the electrical characteristics of the a-IGZO TFT. The composition ratio of the a-IGZO target and oxygen flow rate affect the presence of oxygen vacancies. This study investigated the impact of different oxygen flow rates on the electrical characteristics of a-IGZO TFTs and found that the optimized TFT exhibited improved conductivity due to the presence of oxygen vacancies.
Review
Materials Science, Multidisciplinary
Raksan Ko, Dong Hyun Lee, Hocheon Yoo
Summary: This study investigates the annealing effects of various dopants, time, and ambient conditions on the material properties of TMDCs, including crystal quality, defect density, carrier mobility, electronic properties, and energy levels within the bandgap.
Article
Chemistry, Physical
Eunhee Park, Taehyun Park, Hocheon Yoo, Jaehyun Hur
Summary: In this study, a self-powered high-performance UVC photodetector was developed using a solution-processed PN heterojunction. The selective absorption of UVC wavelength range was achieved through quantum confinement. The optimized device exhibited remarkable responsivity, detectivity, UVC rejection ratio, and stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Seongjae Kim, Seongin Hong, Hocheon Yoo
Summary: In this study, the p-type dominant characteristics of MoSe2 FET were improved through an annealing process, which resulted in a more symmetrical output swing and improved noise margin compared to a digital inverter composed of only n-type dominant MoSe2 FETs. Raman spectroscopy and statistical analysis were used to validate the charge transport behavior in multiple devices.
IEEE TRANSACTIONS ON NANOTECHNOLOGY
(2022)
