Article
Engineering, Electrical & Electronic
Sunghyun Park, Boyeon Park, Seoung-Pil Jeon, Youngjin Kang, Jaehyun Kim, Sung Kyu Park, Yong-Hoon Kim
Summary: Multicationicoxide semiconductors have tunable physical properties by the cation compositions, and Ti doping in amorphous zinc-tin-oxide thin-film transistors (TFTs) affects their electrical properties and gate-bias stability. The optimal Ti concentration was found to be about 1.14 atom %, resulting in TFTs with a field-effect mobility of 8.2 cm(2) V-1 s(-1), a subthreshold slope of 0.208 V decade(-1), an on/off ratio of 3.38 x10(8), a hysteresis of 2.8 V, and a threshold voltage shift of +5.61 and -2.24 V under positive- and negative-bias stresses, respectively.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yong Min Lee, Byung Ku Jung, Junhyuk Ahn, Taesung Park, Chanho Shin, Tse Nga Ng, In Soo Kim, Ji-Hyuk Choi, Soong Ju Oh
Summary: An effective surface-doping strategy for CdSe nanocrystals is introduced, which shows that smaller nanocrystals are more easily doped due to their larger specific surface area. A flexible CdSe nanocrystal thin-film transistor is successfully fabricated at a low temperature, with high electron mobility and on-to-off current ratio.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Taeyoung Kim, Yoonsok Kim, Juntae Ahn, Eun Kyu Kim
Summary: The effect of barrier-controlled electrodes on the characteristics of amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) was studied by using an interlayer with modulated oxygen defects. Different resistivity interlayers of a-IGZO were controlled with various oxygen ratios during RF sputtering deposition. By inserting a-IGZO thin layers with different resistivities between the a-IGZO TFT channel and the source/drain electrodes, the threshold voltage, on/off ratio, subthreshold swing, and mobility of the devices were significantly improved.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Kishwar Mashooq, Jaesung Jo, Rebecca L. Peterson
Summary: This study presents the use of a floating metal cap layer and surface passivation to significantly improve the effective mobility and ON-OFF current ratio of p-type SnO TFTs. A record high p-type SnO TFT mobility of 19.1 cm(2)V(-1)s(-1) was achieved using a Ni/Au capping layer. The use of a bilayer TFT structure and appropriate surface passivation led to an approximately 8-fold improvement in the ON-OFF current ratio of SnO TFTs. Additionally, SnO bilayer TFTs exhibited more robust behavior to gate-bias stress compared to traditional SnO TFTs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Automation & Control Systems
Eva Bestelink, Olivier de Sagazan, Lea Motte, Max Bateson, Benedikt Schultes, S. Ravi P. Silva, Radu A. Sporea
Summary: This paper introduces a multimodal thin-film transistor that achieves two complementary device functions by independently controlling charge injection and transport in the active material layer. It offers low distortion, tolerance to variations, and is suitable for compact circuits and energy-efficient analog computation.
ADVANCED INTELLIGENT SYSTEMS
(2021)
Article
Chemistry, Analytical
Chang-Hyun Kim
Summary: This study conducts a comparative theoretical analysis of different doping schemes in organic semiconductor devices, focusing on bulk and contact doping methods and their impact on the terminal characteristics of field-effect transistors. The research shows that bulk doping offers effective current modulation, while contact doping is useful for overcoming high-barrier contacts. Additionally, the concept of selective channel doping is presented as an alternative approach to improve device performance.
Article
Engineering, Electrical & Electronic
Tonglin L. Newsom, Christopher R. Allemang, Tae H. Cho, Neil P. Dasgupta, Rebecca L. Peterson
Summary: By depositing both ZTO channel and Al2O3 gate dielectric layer using ALD without breaking vacuum, we achieved TFTs with a steep SS of 59.9mV center dot dec(-1), close to the Boltzmann limit at room temperature. The measured SS value extracted an extremely low interface trap density of 9.59 x 10(9) cm(-2)eV(-1), which was corroborated by the high-low frequency capacitance method. Compared with other TFT processes, both higher-k gate dielectric and in situ ALD process are required to obtain the low SS value. The TFT made with in situ dielectric deposition demonstrated a maximum linear mobility of 19.2 cm(2)V(-1)s(-1), an ON/OFF current ratio > 10(8), and a threshold voltage of 1.3 V. The achieved sharp SS will enable low voltage electronics using this scalable ALD technology.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Gyo Kitahara, Mitsuhiro Ikawa, Satoshi Matsuoka, Shunto Arai, Tatsuo Hasegawa
Summary: Achieving steep and stable switching operations in polymer thin-film transistors (TFTs) requires whole optimizations for eliminating interfacial carrier traps, with inverted-coplanar-type TFTs composed of a highly lyophobic amorphous perfluoropolymer gate-dielectric interfaced with a push-coated semiconducting polymer layer showing bias-stress-free characteristics and minimized contact resistance. Additionally, utilizing a particular donor-acceptor copolymer with a self-passivation mechanism can lead to fairly sharp on/off switching TFTs with the smallest normalized subthreshold swing, paving the way for low-power and robust device operations in polymer-based flexible electronics.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Sungmin On, Young-Joon Kim, Han-Koo Lee, Hocheon Yoo
Summary: The study systematically investigated the chemical and morphological structure of small-molecule organic semiconductor heterostructures, demonstrating ambipolar and anti-ambipolar transistors with unique applications.
APPLIED SURFACE SCIENCE
(2021)
Review
Chemistry, Physical
Boon Kar Yap, Zihan Zhang, Gregory Soon How Thien, Kah-Yoong Chan, Chou Yong Tan
Summary: The electronics industry is experiencing growing demand for semiconductor materials, leading researchers to investigate active semiconductors that can meet the increasing needs of this sector. Indium oxide (In2O3) is a potential candidate due to its favorable characteristics such as high carrier mobility, low processing temperature, electrical uniformity, transparency, and cost-effectiveness. In2O3-based thin-film transistors (TFTs) have demonstrated excellent properties, including high electron mobility, low sub-threshold swing, high on/off current ratio, and transparency. This review provides an overview of metal oxide semiconductor materials, specifically focusing on In2O3-based TFTs, discussing their structural properties and recent advancements, and presenting potential outcomes and future perspectives.
APPLIED SURFACE SCIENCE ADVANCES
(2023)
Article
Engineering, Electrical & Electronic
Hui Yang, Weiguang Yang, Jinbao Su, Xiqing Zhang
Summary: Thin film transistors (TFTs) with aluminum and phosphorus co-doped indium-zinc-oxide (IZO:Al,P) channel layer were fabricated by RF magnetron sputtering. The TFTs showed high transparency and excellent electrical performance.
SOLID-STATE ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Ji-Young Go, Gwon Byeon, Taesu Choi, Shuzhang Yang, Wenwu Li, Yong-Young Noh
Summary: This study explores the potential of using an organic salt, N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, as a dopant for Sn-based perovskite devices. The thin film transistors based on the doped 2D/3D perovskite PEAFASnI(3) show remarkable improvement in hole mobility, with a low subthreshold swing, small sweep hysteresis, and exceptional bias stability. The bulky chemical structure of the dopant prevents it from penetrating the perovskite lattice and provides surface passivation against Sn oxidation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Review
Chemistry, Physical
Chenfang Sun, Tie Wang
Summary: The early determination of disease-related biomarkers can improve patient survival rate significantly. Therefore, explorations for new diagnosis technologies, such as optical and electrochemical methods, have been devoted to life and health monitoring. Organic thin-film transistor (OTFT), as a label-free, low-cost, facial, and rapid detection technology, has attracted significant attention. However, the reliability and accuracy of the biosensor need to be improved while ensuring sensitivity, selectivity, and stability.
Article
Engineering, Electrical & Electronic
Peng Li, Jiangang Ma, Huifang Wang, Weizhen Liu, Zhongshi Ju, Bingsheng Li, Haiyang Xu, Yichun Liu
Summary: This study demonstrates that acceptor doping and interface energy band engineering can be utilized to optimize the performance of In2O3:Ni/Ga2O3 heterojunction thin-film transistors (TFTs) for UV-C photodetection. By energy band alignment, the optimized TFTs exhibit high responsivity, UV-C/visible light rejection ratio, and detectivity under UV-C illumination.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Noh-Hwal Park, Eun Sol Shin, Gi-Seong Ryu, Jimin Kwon, Dongseob Ji, Hyunjin Park, Yun Ho Kim, Yong-Young Noh
Summary: This study reports an effective approach to improve the performance of solution processed semiconducting SWNT TFTs by selective doping with a thin ferric chloride (FeCl3) layer. By controlling the concentration and thickness of the dopant layer, high field-effect mobility, reasonable on/off ratio, and low off current can be achieved.
JOURNAL OF INFORMATION DISPLAY
(2022)
Article
Engineering, Electrical & Electronic
Lianjia Wu, Milos Baljozovic, Giuseppe Portale, Dimitrios Kazazis, Michaela Vockenhuber, Thomas Jung, Yasin Ekinci, Sonia Castellanos
JOURNAL OF MICRO-NANOLITHOGRAPHY MEMS AND MOEMS
(2019)
Article
Multidisciplinary Sciences
Mina Moradi, Nadia L. Opara, Ludovico G. Tulli, Christian Waeckerlin, Scott J. Dalgarno, Simon J. Teat, Milos Baljozovic, Olha Popova, Eric van Genderen, Armin Kleibert, Henning Stahlberg, Jan Pieter Abrahams, Celestino Padeste, Philippe F-X Corvini, Thomas A. Jung, Patrick Shahgaldian
Article
Materials Science, Multidisciplinary
Judith Woerle, Brett C. Johnson, Corrado Bongiorno, Kohei Yamasue, Gabriel Ferro, Dipanwita Dutta, Thomas A. Jung, Hans Sigg, Yasuo Cho, Ulrike Grossner, Massimo Camarda
PHYSICAL REVIEW MATERIALS
(2019)
Article
Physics, Applied
Pooja Thakkar, Vitaliy A. Guzenko, Peng-Han Lu, Rafal E. Dunin-Borkowski, Jan Pieter Abrahams, Soichiro Tsujino
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
David Miklik, S. Fatemeh Mousavi, Zuzana Buresova, Anna Middleton, Yoshitaka Matsushita, Jan Labuta, Aisha Ahsan, Luiza Buimaga-Iarinca, Paul A. Karr, Filip Bures, Gary J. Richards, Pavel Svec, Toshiyuki Mori, Katsuhiko Ariga, Yutaka Wakayama, Cristian Morari, Francis D'Souza, Thomas A. Jung, Jonathan P. Hill
Summary: This study reports on pyrazinacenes in acenes and azaacenes, comparing their properties/functions at different oxidation states. Experimental and theoretical studies show that these compounds are stable against oxidation but unstable against reduction, providing a rich model case for understanding the properties of a redox-switchable pi-electronic system in solution and at interfaces. Acenes and azaacenes are promising classes of organic materials with distinctive electronic and optical properties.
COMMUNICATIONS CHEMISTRY
(2021)
Article
Chemistry, Physical
Mina Moradi, Nadia L. Lengweiler, Catherine E. Housecroft, Ludovico G. Tulli, Henning Stahlberg, Thomas A. Jung, Patrick Shahgaldian
Summary: Monolayer-to-bilayer transitions in 2D metal-organic networks were studied at the water-air interface, where Ni(II) and Cu(II) ions play distinct roles in layer assembly. This research introduces a new dimension in controlling the multilayer architecture of 2D metal-organic networks through diffusive reorganization and chemical vacancies.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Chemistry, Inorganic & Nuclear
Milos Baljozovic, Xunshan Liu, Olha Popova, Jan Girovsky, Jan Nowakowski, Harald Rossmann, Thomas Nijs, Mina Moradi, S. Fatemeh Mousavi, Nicholas C. Plumb, Milan Radovic, Nirmalya Ballav, Jan Dreiser, Silvio Decurtins, Igor A. Pasti, Natalia Skorodumova, Shi-Xia Liu, Thomas A. Jung
Summary: This study focuses on the development of on-surface supramolecular architecturing to create surface supported two-dimensional binary spin arrays on non-magnetic Au(111). Different checkerboards were produced by combining phthalocyanines containing metals of different oxidation and spin states. The research correlates the structure and magnetic properties of these systems, discussing the emergence of 2D Kondo magnetism and the role of the underlying substrate.
Article
Multidisciplinary Sciences
Michal W. Kepa, Takashi Tomizaki, Yohei Sato, Dmitry Ozerov, Hiroshi Sekiguchi, Nobuhiro Yasuda, Koki Aoyama, Petr Skopintsev, Jorg Standfuss, Robert Cheng, Michael Hennig, Soichiro Tsujino
Summary: Acoustic levitation plays a crucial role in chemical and biochemical analysis, but loading high viscosity samples is challenging. By using polymer thin films as sample holders and studying their acoustic levitation and rotation, it is possible to achieve controlled rotation and positional stability for the samples.
SCIENTIFIC REPORTS
(2022)
Review
Engineering, Electrical & Electronic
Soichiro Tsujino
Summary: This article provides an overview of the key characteristics of field emitters for beam applications, such as high beam brightness, transverse emittance, and transverse coherence. It discusses their implications on the coherent propagation of the field emission beam.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2022)
Article
Chemistry, Physical
Aisha Ahsan, Luiza Buimaga-Iarinca, Thomas Nijs, Sylwia Nowakowska, Sk Rejaul, S. Fatemeh Mousavi, Mehdi Heydari, Meike Stoehr, Sameena S. Zaman, Cristian Morari, Lutz H. Gade, Thomas A. Jung
Summary: Host-guest architectures provide ideal systems for investigating site-specific physical and chemical effects. In this study, we found that the symmetry, registry, lateral packing, and adsorption height of small clusters formed upon condensation are modified by the presence of cycloalkanes in confined spaces. While cyclopentane and cycloheptane show cooperativity upon filling, cyclooctane and to a lesser degree cyclohexane redistribute to more favorable adsorption sites. This site-specific modification of interaction and behavior is crucial for applications of porous materials in gas storage or catalysis.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Applied
Shichao Jia, Yohei Sato, Soichiro Tsujino
Summary: The controlled rotation of acoustically levitated samples is beneficial for analyzing sample properties, and the study finds that short blades play an essential role in producing the acoustic torque.
APPLIED PHYSICS LETTERS
(2022)
Proceedings Paper
Acoustics
Michal W. Kepa, Takashi Tomizaki, Soichiro Tsujino
Summary: The recently developed acoustic levitation diffractometer combines ultrasonic acoustic levitation with a highly brilliant X-ray source and fast-frame-rate X-ray image detector to allow for high speed data collection for protein crystallography experiments. One research goal is to apply this system to a fully automated high throughput pipeline of protein crystallography experiments.
INTERNATIONAL ULTRASONICS SYMPOSIUM (IEEE IUS 2021)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
P. Thakkar, V. A. Guzenko, P-H Lu, R. E. Dunin-Borkowski, J. P. Abrahams, S. Tsujino
Summary: A three-element Boersch phase shifter for the wavefront manipulation of coherent electron beams is reported in this work. By utilizing a five-layer structure, parasitic beam deflection was successfully suppressed, paving the way for the realization of programmable holographic synthesis of electron waves in multiple dimensions.
2021 34TH INTERNATIONAL VACUUM NANOELECTRONICS CONFERENCE (IVNC)
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
Soichiro Tsujino, Takashi Tomizaki, Michal W. Kepa
PROCEEDINGS OF THE 2020 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)
(2020)
Article
Chemistry, Multidisciplinary
Aisha Ahsan, S. Fatemeh Mousavi, Thomas Nijs, Sylwia Nowakowska, Olha Popova, Aneliia Wackerlin, Jonas Bjork, Lutz H. Gade, Thomas A. Jung
