Article
Engineering, Electrical & Electronic
Ankit Verma, V. N. Mishra, Rajiv Prakash
Summary: In this article, a self-aligned, cost-efficient, fully solution-processed, and low-voltage operated high-k dielectric-based p-channel organic thin-film transistor (OTFT) has been developed and investigated for toxic ammonia analyte at room temperature. The study reveals that this novel low-voltage OTFT device is capable of operating at -2 V and has shown a high sensitivity toward ammonia gas detection at RT.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ankit Verma, V. N. Mishra, Rajiv Prakash
Summary: In this study, a self-aligned, cost-efficient, fully solution-processed, and low-voltage operated high-k dielectric-based p-channel organic thin-film transistor (OTFT) was developed for toxic ammonia analyte detection at room temperature. The OTFT sensor showed a high response rate of 47% at 5 ppm NH3 analyte and a low detection limit of 11.65 ppb. The developed sensor exhibited stable performance independent of relative humidity variations in the range of 30%-70%. The study demonstrates the capability of this novel low-voltage OTFT device to detect ammonia gas at room temperature.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Ankit Verma, Varun Kumar Singh, V. N. Mishra
Summary: In this work, a self-assembled, low-voltage organic thin-film transistor (TFT) was made and used for inverter application. The device was fabricated by depositing a uniform organic polymer film using the floating film transfer (FTM) method over spin-coated LiZnOx dielectric film. The fabricated low-voltage inverter showed good performance with a high gain of around 12 and a noise margin of 1.7 V.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
Qian Zhang, Cheng Ruan, Guodong Xia, Hongyu Gong, Sumei Wang
Summary: This study demonstrates the feasibility of using lightwave-derived low-temperature annealing to enhance the performance of IGZO TFTs, showing that lightwave annealing can effectively facilitate the decomposition of IGZO precursors and form smooth dense films compared to conventional furnace annealing. The optimal IGZO TFTs exhibit high carrier mobility and a large on-current to off-current ratio when AlOx is used as the dielectric layer, indicating great potential for the fabrication of low-cost wearable devices in the future.
Article
Nanoscience & Nanotechnology
Katie Stallings, Jeremy Smith, Yao Chen, Li Zeng, Binghao Wang, Gabriele Di Carlo, Michael J. Bedzyk, Antonio Facchetti, Tobin J. Marks
Summary: Metal oxide semiconductors, such as a-IGZO, have shown impressive progress as alternatives to amorphous silicon in electronics applications, but require compatible unconventional gate dielectric materials. Solution-processable self-assembled nanodielectrics (SANDs) composed of alternating organic and inorganic oxide layers offer high capacitances and low processing temperatures, yet have not been implemented in the top-gate TFT architecture.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Ankit Verma, Shipra Gupta, V. N. Mishra, Rajiv Prakash
Summary: This study focuses on the fabrication and characterization of a low-voltage, flexible organic thin film transistor (OTFT) for ammonia sensing. The device utilizes a hybrid dielectric layer and a polymer/2-D nanocomposite as the gate oxide and active layer respectively. The results show that the fabricated device has good electrical characteristics and can detect ammonia gas at low concentrations.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Materials Science, Multidisciplinary
S-J Wang, M. Sawatzki, H. Kleemann, I Lashkov, D. Wolf, A. Lubk, F. Talnack, S. Mannsfeld, Y. Krupskaya, B. Buechner, K. Leo
Summary: Rubrene single crystal domains with hundreds of micrometers size covering different substrates are achieved by thermal annealing and the assistance of a thin glassy underlayer, enabling high-performance rubrene crystalline transistors. The contact resistance of the transistors is significantly reduced through doping techniques, paving the way for novel high-performance organic electronics using crystalline active materials.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Vishwas Acharya, Nila Pal, Anand Sharma, Utkarsh Pandey, Mukesh Suthar, Pradip Kumar Roy, Sajal Biring, Bhola N. Pal
Summary: A thin layer of sol-gel derived lithium stannate (Li2SnO3) with low DC conductivity and high areal capacitance was deposited using a spin coating method. Adding a sol-gel derived titanium-oxide (TiO2) layer further reduced the DC conductivity of the Li2SnO3 thin film. The bilayer thin film of Li2SnO3/TiO2 exhibited increased effective areal capacitance and met the requirement for a low operating voltage thin film transistor (TFT) gate dielectric.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Vishwas Acharya, Nila Pal, Utkarsh Pandey, Akhilesh Kumar Yadav, Mukesh Suthar, Pradip Kumar Roy, Sajal Biring, Bhola N. Pal
Summary: This study demonstrates the deposition of SrTiO3 thin film using a simple solution processed technique and its application in the fabrication of sol-gel derived SnO2 TFT. The high dielectric constant of the SrTiO3 thin film allows the TFT to operate in both low voltage and high voltage ranges. Experimental results show hysteresis-free characteristics in the low voltage range (<2 V), but some hysteresis effects appear in the higher voltage range (>5 V).
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Ceramics
Alfredo Blazquez Martinez, Nicolas Godard, Naveen Aruchamy, Cosme Milesi-Brault, Oana Condurache, Andreja Bencan, Sebastjan Glinsek, Torsten Granzow
Summary: In this study, polycrystalline Mn and Ti co-doped BiFeO3 thin films were fabricated on platinized silicon substrates by a solution deposition method, with PbTiO3 nanocrystals used as a seed layer to induce a preferential (100) pseudocubic orientation. The introduction of a PbTiO3 seed layer significantly reduced the leakage current and resulted in excellent room-temperature ferroelectric properties in the thin films.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Yeoungjin Chang, Ravindra Naik Bukke, Jinbaek Bae, Jin Jang
Summary: This study investigates the use of a low-temperature solution-processed HfZrOx gate insulator to enhance the performance of LaZnO TFTs. The optimized HfZrO-250°C GI-based LaZnO TFT exhibits excellent electrical properties and can be widely used in the field of flexible electronics.
Article
Polymer Science
Zhengran He, Ziyang Zhang, Kyeiwaa Asare-Yeboah, Sheng Bi, Jihua Chen, Dawen Li
Summary: This study demonstrated the use of a metal-containing semicrystalline polymer as an additive to mediate the thin film morphology of solution-grown, small-molecule organic semiconductors, resulting in improved performance of organic thin film transistors.
Article
Nanoscience & Nanotechnology
Tianyu Tang, Jakob Zessin, Felix Talnack, Katherina Haase, Katrin Ortstein, Baiqiang Li, Markus Loeftler, Bernd Rellinghaus, Mike Hambsch, Stefan C. B. Mannsfeld
Summary: This study reports the improvement of electronic properties of solution-processed indium oxide films by adding an organic p-type semiconductor material, resulting in organic-inorganic hybrid TFTs. The addition of TIPS-pentacene enhances electron mobility, improves electronic stability, and reduces the number of required spin-coating steps. The hybrid TFTs exhibit either enhancement- or depletion-mode behavior depending on the fabrication process, showing potential for the construction of organic-inorganic hybrid electronics and circuits.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Polymer Science
Yeqing Sun, Ziyang Zhang, Kyeiwaa Asare-Yeboah, Sheng Bi, Zhengran He
Summary: Phase segregation induced by mixing organic semiconductors with polymeric additives has been effectively utilized in this study to control semiconductor crystal growth and morphology. The inclusion of poly(butylacrylate) resulted in vertical and lateral phase segregation with TIPS pentacene, leading to improved grain width and reduced crystal misorientation. The reported method shows potential for high performance organic electronic device applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
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
Physics, Applied
Lei Han, Yukun Huang, Wei Tang, Sujie Chen, Jiaqing Zhao, Xiaojun Guo
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2020)
Article
Engineering, Electrical & Electronic
Qiuqi Zhang, Siying Li, Wei Tang, Xiaojun Guo
IEEE SENSORS JOURNAL
(2020)
Article
Engineering, Electrical & Electronic
Lei Han, Sujie Chen, Li'ang Deng, Yawen Song, Yukun Huang, Siying Li, Ming Li, Wei Tang, Yuezeng Su, Xiaojun Guo
Summary: By using a through-plastic-via (TPV) three-dimensional (3D) integration approach, the organic field effect transistor (OFET) circuitry and sensing/reference electrodes (SE/RE) can be integrated for flexible bio-chemical sensor chips, improving signal amplification and noise suppression for weak ion response detection.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Physics, Applied
Songyang Guo, Siying Li, Tao Shen, Wei Tang, Xiaojun Guo, Juan Xin, Junjun Jin, Huili Wei, Xianbao Wang, Jinhua Li
Summary: In this study, it was found that the decrease in mobility in OTFTs using high-k relaxor ferroelectric polymer as the gate dielectric is due to the Frohlich polaron effect with increasing gate dielectric constant. Introducing a low-k polymer as a modification layer can eliminate this effect, and constructing a low-k/high-k bilayer dielectric can achieve better mobility and improved bias stability. A flexible top-gate OTFT on a polyethylene terephthalate substrate demonstrated good bending stability even after 1000 bending tests.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Xiao Hou, Sujie Chen, Wei Tang, Jianghu Liang, Bang Ouyang, Ming Li, Yawen Song, Tong Shan, Chun-Chao Chen, Patrick Too, Xiaoqing Wei, Libo Jin, Gang Qi, Xiaojun Guo
Summary: A facile blade-coating process is developed for large-area deposition of uniform thick organic active layers in organic photodiodes (OPDs). A large-area semi-transparent top metal electrode is deposited using thermal evaporation with an optimal deposition rate, achieving a good balance between transparency and conductivity for top illumination integration. The maximum process temperature of the OPD is 85 degrees C, ensuring the performance of the underlying organic thin-film transistor (OTFT) is not affected. Based on this integration structure and processes, an all-organic integrated flexible active-matrix imager is developed, which has the largest size, highest resolution, and lowest process temperature reported so far for OPD-based imagers.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Taoming Guo, Jian Geng, Yilun Zhong, Chenyang Li, Bowen Liu, Yaoshan Qin, Wei Tang, Huazhong Yang, Yuanyuan Liu, Chen Jiang
Summary: In this study, a two-dimensional sample rotation method using a Ferris wheel was proposed to improve the thickness uniformity of Parylene-C dielectrics, leading to better transistor uniformity. The use of this rotation method significantly reduced the variation in dielectric thickness and improved the performance of the fabricated transistors. The improved device uniformity is beneficial for complex flexible circuit design and advanced applications such as edge intelligence.
FLEXIBLE AND PRINTED ELECTRONICS
(2022)
Review
Materials Science, Multidisciplinary
Dongping Wang, Zhe Liu, Jun Li, Wei Tang, Yukun Huang, Jun Yu, Longqian Xu, Qi Huang, Yawen Song, Linzhi Wang, Haihan Jin, Kerui Xi, Linrun Feng, Xiaojun Guo, Arokia Nathan, Hanbin Ma
Summary: This article mainly reviews the application of thin-film transistor array technology in biological sensing systems. The development of TFT-based AM DMF chips and the summary and discussion of TFT array-based biological sensing systems are the focus.
FLEXIBLE AND PRINTED ELECTRONICS
(2022)
Article
Biotechnology & Applied Microbiology
Ya-Lei Wang, Xin Zhang, Quan Wang, Peng-Xuan Liu, Wei Tang, Rong Guo, Hai-Yang Zhang, Zhao-Guo Chen, Xian-Gan Han, Wei Jiang
Summary: This study developed a novel approach combining lateral flow recombinase polymerase amplification (RPA-LF) with immunomagnetic separation (IMS) for rapid detection of Staphylococcus aureus in milk. The method showed high sensitivity, specificity, and speed, detecting as low as 40 CFU per reaction in milk samples within a total testing time of 70 minutes.
JOURNAL OF APPLIED MICROBIOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Xin Xi, Wei Tang, Dongqing Wu, Chaochao Shen, Wei Ji, Jun Li, Yuezeng Su, Xiaojun Guo, Ruili Liu, Feng Yan
Summary: The use of carbon materials in all-carbon electronic devices allows for the preparation of components with different properties and functions. In this study, an all-carbon solution-gated transistor (AC-SGT) based dopamine sensor was fabricated using Nafion coated nitrogen and oxygen co-doped carbon yarn as the gate electrode and graphene as the channel. The AC-SGT exhibited excellent dopamine sensing performances in terms of sensitivity, selectivity, limit of detection, linear range, long-term stability, and preconditioning time. Additionally, a smartphone controlled portable sensing system integrated with the AC-SGT showed great in vitro sensing capability of dopamine in urine, demonstrating the potential of all-carbon transistors in smart wearable biosensors.
Article
Engineering, Electrical & Electronic
Xiaokuan Yin, Jun Li, Lei Han, Wei Tang, Yukun Huang, Simon Ogier, Zhe Liu, Yuezeng Su, Xiaojun Guo
Summary: This study proposes a 3D integration architecture using top-gate organic thin-film transistors (OTFT) as pixel switches and bottom-gate organic phototransistors (OPT) for photo-sensing in each pixel. Through low-temperature solution-based integration processes on plastic substrate, a flexible active-matrix imager with high resolution is successfully implemented.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Chaochao Shen, Wei Tang, Xin Xi, Dongqing Wu, Yuezeng Su, Xiaojun Guo, Ruili Liu
Summary: This study applies failure analysis to summarize the risks affecting the stability of Ag/AgCl reference electrodes in wearable sensors and develops fibrous Ag/AgCl reference electrodes with excellent potential stability. These electrodes are used in a skin-attached four-ion-channel organic field-effect transistor to monitor the concentrations of K+, Na+, NH4+, and H+ (pH) in human sweat in real-time and simultaneously. A theoretical model is established to assess the interfacial integrity of the fibrous Ag/AgCl reference electrode. The results show that failure analysis not only helps in constructing miniaturized reference electrodes with high stability but also offers a feasible strategy for the design of electrochemical microsensors operable in harsh and dynamic environments.
IEEE SENSORS JOURNAL
(2023)
Review
Chemistry, Multidisciplinary
Yawen Song, Wei Tang, Lei Han, Yan Liu, Chaochao Shen, Xiaokuan Yin, Bang Ouyang, Yuezeng Su, Xiaojun Guo
Summary: This review discusses the key points in constructing an extended-gate type organic field effect transistor (OFET) biochemical sensor with high sensitivity and stability. It presents the structure and working mechanism of OFET biochemical sensors, emphasizing the importance of critical material and device engineering for better sensing capabilities. It also introduces printable materials for sensing electrodes with high sensitivity, methods for obtaining printable OFET devices with high transconductance efficiency, and approaches for integrating OFETs and sensing electrodes to form portable biochemical sensor chips.
Article
Engineering, Electrical & Electronic
Wei Tang, Ying Fu, Yukun Huang, Yuanzhe Li, Yawen Song, Xin Xi, Yude Yu, Yuezeng Su, Feng Yan, Xiaojun Guo
Summary: Developing organic field-effect transistor (OFET) biosensors for customizable biomarker detection is an important and cost-effective tool for biological studies and clinical diagnosis. This study establishes design principles for OFET biosensors, highlighting key parameters like steep subthreshold swing, proper threshold voltage, bias-stress stability, and mechanical durability that enhance the transconductance efficiency and signal-to-noise ratio. The research also demonstrates the successful implementation of a label-free OFET biosensor for detecting miR-21 with high selectivity and low detection limit.
NPJ FLEXIBLE ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Yixiao Tang, Wei Tang, Yawen Song, Lei Han, Yukun Huang, Ruili Liu, Yuezeng Su, Xiaojun Guo
Summary: This study proposes a low-temperature packaging approach to implement highly stable ISOFETs for multiple ion detection, utilizing silver paste and silicone sealant for packaging. The packaged OFET maintains high stability and demonstrates successful detection of Na+, K+, and H+ ions in a flexible tag design.
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2021)
Article
Engineering, Electrical & Electronic
Yukun Huang, Wei Tang, Linrun Feng, Sujie Chen, Jiaqing Zhao, Zhe Liu, Lei Han, Bang Ouyang, Xiaojun Guo
IEEE JOURNAL OF THE ELECTRON DEVICES SOCIETY
(2020)