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One-step growth of reduced graphene oxide on arbitrary substrates
摘要： Reduced graphene oxide (rGO) has inherited the outstanding electronic, optical, thermal and mechanical properties of graphene to a large extent, while maintaining sufficient chemically active sites. Therefore, it has attracted a great deal of research attention in the fields of energy storage, electronics, photonics, catalysis, environmental engineering, etc. Currently, the most popular way to prepare rGO is to reduce graphene oxide, which is obtained by modified Hummer methods using tedious treatments in a harsh environment, to rGO flakes. Industrial applications demand advanced preparation methods that can mass produce highly uniform rGO sheets on arbitrary substrates. In this work, a one-step growth process is introduced that utilizes cellulose acetate as a precursor, without any catalysts, to produce uniform ultrathin rGO films on various substrates and free-standing rGO powders. Systematic spectroscopic and microscopic studies on the resulting rGO are performed. Prototypes of electronic and optoelectronic devices, such as field effect transistors (FETs), photodetectors, and humidity sensors, are fabricated and tested, demonstrating the intriguing applications of our rGO materials across a wide range of fields.
关键词： electronic devices,reduced graphene oxide,one-step growth,cellulose acetate,optoelectronic devices
更新于2025-11-21 11:03:25
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Manipulation of EM Waves Using Graphene
摘要： This paper briefly reviews our group’s partly progresses in graphene applications in electronic and optical devices. Several examples will be presented, such as electromagnetic black hole, flexible transformation plasmonics, tunable substrate-integrated-waveguide attenuator and electro-optic modulators, and so on. We hope that these theoretical and experimental verifications can further demonstrate the versatility of graphene, and move graphene a step further into the actual applications.
关键词： optical devices,graphene,electronic devices
更新于2025-09-23 15:22:29
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Recent Advancement of Semiconductor Materials and Devices
摘要： 本論文では, 主に GaAs および GaAs 系混晶半導体の MBE 成長とそのデバイス応用について取り上げたが, その他にも窒化物半導体, 酸化物半導体, II-VI 族半導体といった多くの半導体の成長や, 量子細線, 量子ドットのような量子井戸以上に複雑な構造の製作にも MBE 法は活用されている. 基礎研究から実用化まで, 半導体デバイスの開発において MBE 法が成し遂げてきた功績は極めて大きい. 今後も素子構造の製作, 新規半導体材料の成長, 結晶欠陥の制御など様々な要求のある結晶成長時に MBE 法は活用され続けるであろう.
关键词： Compound semiconductors,Optical and electronic devices,Molecular beam epitaxy
更新于2025-09-23 15:22:29
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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Mechanism of non-saturated field electron emission from gated p-type Si tips
摘要： Gated p-type Si tip arrays with the same gate area (AG) but various tip numbers (Ntip) were investigated to clarify the mechanism of non-saturated electron emission. It was found that the Ntip/AG ratio determines the current increasing rate (dI/dVG) of the non-saturated emission. A surface depletion/inversion dominated electron supply model that considered the local Joule heat effect was proposed to interpret the variation of the increasing rate of the non-saturated current. Less emitter in an array would lead to a higher average current on each tip, and thereby much local Joule heat to induce a stronger non-saturated emission. This work clarifies the mechanism of non-saturated emission from gated p-type emitters, and shows that the current increasing rate can be modified by changing the Ntip/AG ratio. The findings are crucial for designing reliable and controllable Si-based electron sources.
关键词： electron supply,vacuum electronic devices,p-type field electron emitter,Joule heat
更新于2025-09-23 15:21:21
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[Springer Theses] Electrical Properties of Indium Arsenide Nanowires and Their Field-Effect Transistors || Introduction
摘要： As the miniaturization and integration of solid-state electronic devices has continued to increase rapidly with the demands of high speed, low power consumption and high storage density, the conventional Si-based technology has lost their advantages on fabrication process. Therefore the technologies based on new materials gradually attract researchers’ attention. Among them, Indium Arsenide (InAs) nanowires (NWs) with high electron mobility is one of the most promising candidate. In this chapter, we introduce the advantages of InAs nanowire on electronic devices and the development status of InAs nanowire electronic devices. Also, the topic ideas and chapter arrangements of this thesis are presented.
关键词： solid-state,high electron mobility,electronic devices,InAs nanowires,miniaturization
更新于2025-09-23 15:21:21
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Recent Advances in Fiber-Shaped and Planar-Shaped Textile Solar Cells
摘要： During the last few years, textile solar cells with planar and fiber-shaped configurations have attracted enormous research interest. These flexible-type solar cells have a huge potential applicability in self-powered and battery-less electronics, which will impact many sectors, and particularly the Internet of Things. Textile solar cells are lightweight, super-flexible, formable, and foldable. Thus, they could be ideal power-harvester alternatives to common flexible solar cells required in smart textiles, electronic textiles, and wearable electronic devices. This review presents a brief overview on fiber-shaped and planar-shaped solar cells, and it introduces the most recent research reports on the different types of textile solar cells, including details on their fabrication techniques. It also addresses the current challenges and limitations of their technology development, and the encountered issues for their future application and integration in novel devices.
关键词： Electronic textiles,Smart textiles,Textile solar cells,Power harvesting,Fiber-shaped solar cells,Wearable electronic devices
更新于2025-09-23 15:19:57
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Non-covalent Interaction Controlled 2D Organic Semiconductor Films: Molecular Self-Assembly, Electronic and Optical Properties, and Electronic Devices
摘要： The establishment of electronic and opto-electronic products relying on organic semiconductors (OSCs) has been intensely explored over the past few decades due to their great competitiveness in large area, low cost, flexible, wearable and implantable devices. Many of these products already entered our daily lives, such as organic light-emitting diodes-based displays, portable organic solar cells and organic field-effect transistors. The device performance of OSC devices are determined by the supramolecular organization (orientation, morphology) as well as the supramolecular organization dependent energy level alignment at various interfaces (organic/electrode, organic/dielectric, organic/organic). This review focuses on the impact of non-covalent interaction on the molecular self-assembly of organic thin films, their electronic and optical properties, as well as the device performance. Beginning with the growth of multiple OSCs on substrates with different interfacial interaction strengths (metals, insulators, semiconductors), the critical roles of molecule-substrate and intermolecular interactions in determining the thin film organization have been demonstrated. Several non-covalent interactions that contribute to the energy levels of organic materials in solid phase are summarized, mainly including the induction contributions, electrostatic interactions, band dispersions and interface dipoles. The excitonic coupling in specific aggregations of organic molecules and the corresponded effect on their optical properties are also discussed. Finally, the influences of weak intermolecular interactions on the device performance are presented.
关键词： molecular self-assembly,optical properties,non-covalent interaction,electronic properties,electronic devices,organic semiconductors
更新于2025-09-23 15:19:57
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Large-area High-contrast Hydrophobic/Hydrophilic Patterned Surface for Robust Electrowetting Devices
摘要： Hydrophobic/hydrophilic patterned surfaces (HHPS) are found in nature, and highly desired for practical applications as well. Building hydrophilic patterns firmly on low free energy hydrophobic coatings has been a long-term challenge. Conventional process of reactive ion etching combined with a thermal reflow (RIE-reflow) process results in degradation of both the hydrophobicity and dielectric strength of the hydrophobic coatings. In this work, we propose a reconstructive approach by encapsulating the “damaged” hydrophobic Teflon AF 1600 (AF) surface with a fresh one to keep its hydrophobicity the same as a virgin AF surface; and at the same time, enhance the hydrophilicity of patterned microstructures by local plasma etching method with a self-assembled protection mask. In this way, the extremely high wettability contrast with a large oil/water contact angle difference (Δθo/w) of 175o is reached between the hydrophobic and hydrophilic surfaces. Comparing to the conventional RIE-reflow process, the AF films prepared by this reconstruction process show superior dielectric strength and surface hydrophobicity. Electrowetting display devices constructed by this process demonstrate improved optical and electrical performance, presenting a more uniform pixel aperture ratio, higher voltage tolerance, and less leakage current compared to those made using the conventional “RIE-reflow” process.
关键词： electronic devices,large-area fabrication,hydrophobic/hydrophilic pattern,dielectric film,electrowetting,wettability contrast
更新于2025-09-19 17:15:36
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A wearable helical organic–inorganic photodetector with thermoelectric generators as the power source
摘要： A self-powering feature is particularly appealing for wearable electronic devices when facing the challenges of energy and environmental crises. Photodetectors (PDs), as promising candidates for health and environment monitoring, are urgently desired to meet the requirements of being wearable and powerless. Unlike conventional photovoltaic-type PDs, we have come up with a novel approach to make a self-powered wearable PD, which involves connecting PDs with thermoelectric generators (TEGs) in series on the surface of a three-dimensional helical polymer substrate. The wearable system is light-weight, flexible and breathable. More importantly, compared with photovoltaic-type self-powered PDs, wearable PDs powered by TEGs will work as a system whose output signal can be greatly amplified by the temperature difference between the human body and the environment in winter when UV intensity is relatively low.
关键词： UV intensity,thermoelectric generators,self-powered,wearable electronic devices,photodetectors
更新于2025-09-16 10:30:52
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Self-Assembled Monolayers with Distributed Dipole Moments Originating from Bipyrimidine Units
摘要： The concept of distributed dipoles in monomolecular self-assembly on solid substrates was tested for the example of thiolate self-assembled monolayers (SAMs) on Au(111) containing dipolar 2,5?-bipyrimidine units. These were attached to a thiol anchoring group either directly or via a phenylene-methylene spacer, with the spacer decoupling the dipolar moiety from the substrate and promoting layer formation. As expected, the SAMs containing spacer groups exhibited a higher quality, including a higher packing density and nearly upright molecular orientation. The electrostatic effects of the dipolar bipyrimidine moieties were tested through C 1s and N 1s photoemission spectra, where electrostatic core-level shifts impact the shapes of the spectra. Additionally, changing the orientation of the dipoles allows a variation of the work function over a range of ~1.35 eV. The experiments were complemented by density-functional theory calculations. The work function tuning range was reasonably high, but smaller than expected considering that for SAMs with a single embedded pyrimidine group per molecule work-function changes already amounted to ~1.0 eV. This behavior is rooted in an asymmetry of the studied SAMs: For dipoles pointing away from the substrate, the expected doubling of the work function change between monopyrimidine and bipyrimidine SAMs essentially occurs. Conversely, for the downward-oriented pyrimidine dipoles, the second polar ring has hardly any effect. Consistent observations were made for the core-level shifts. We discuss several factors, which are potentially responsible for this asymmetry, like disorder, depolarization, or Fermi-level pinning. Of these, the most likely explanation is the adsorption of airborne contaminants interacting with the nitrogen atoms in the immediate vicinity of the outer surface, which are present only in films with downward oriented dipoles. In spite of these complications, some of the introduced distributed dipole SAMs serve as important model systems for understanding electrostatic effects at interfaces. They are also of interest for controlling carrier-injection barriers in organic (opto)electronic devices.
关键词： Bipyrimidine Units,Distributed Dipole Moments,Self-Assembled Monolayers,Organic (Opto)electronic Devices,Work Function Tuning
更新于2025-09-12 10:27:22