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Multiferroic oxide BFCNT/BFCO heterojunction black silicon photovoltaic devices

Light(Science & Applications) 2021年第11期10卷 2153-2160页

作者： Kaixin Guo Xu Wang Rongfen Zhang Zhao Fu Liangyu Zhang Guobin Ma Chaoyong Deng Key Laboratory of Electronic Composites of Guizhou Province College of Big Data and Information EngineeringGuizhou UniversityGuiyang550025GuizhouChina Guizhou College of Electronic Science and Technology Guiyang561113GuizhouChina

Multiferroics are being studied increasingly in applications of photovoltaic devices for the carrier separation driven by polarization and *** this work,textured black silicon photovoltaic devices are fabricated with Bi_(6)Fe_(1.6)Co_(0.2)Ni_(0.2)Ti_(3)O_(18)/Bi_(2)FeCrO_(6)(BFCNT/BFCO)multiferroic heterojunction as an absorber and graphene as an *** structural and optical analyses showed that the bandgap of Aurivillius-typed BFCNT and double perovskite BFCO are 1.62±0.04 ev and 1.74±0.04 ev respectively,meeting the requirements for the active layer in solar *** the simulated AM 1.5 G illumination,the black silicon photovoltaic devices delivered a photoconversion efficiency(η)of 3.9%with open-circuit voltage(voc),short-circuit current density(Jsc),and fill factor(FF)of 0.75 v,10.8 mA cm^(-2),and 48.3%,*** of modulation of an applied electric and magnetic field on the photovoltaic properties revealed that both polarization and magnetization of multiferroics play an important role in tuning the built-in electric field and the transport mechanisms of charge carriers,thus providing a new idea for the design of future high-performance multiferroic oxide photovoltaic devices.

关键词： illumination absorber perovskite

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Promising New Horizons in Medicine: Medical Advancements with Nanocomposite Manufacturing via 3D Printing

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POLYMERS 2023年第20期15卷 4122-4122页

作者： Li, Nan Khan, Sadaf Bashir Chen, Shenggui Aiyiti, Wurikaixi Zhou, Jianping Lu, Bingheng Xinjiang Univ Sch Mech Engn Urumqi 830017 Peoples R China Southwest Univ Sci & Technol Sch Mfg Sci & Engn Key Lab Testing Technol Mfg Proc Minist Educ Mianyang 621010 Peoples R China Dongguan Univ Technol Sch Educ Normal Sch Dongguan 523808 Peoples R China Guangzhou Panyu Polytech Sch Art & Design Guangzhou 511483 Peoples R China

Three-dimensional printing technology has fundamentally revolutionized the product development processes in several industries. Three-dimensional printing enables the creation of tailored prostheses and other medical equipment, anatomical models for surgical planning and training, and even innovative means of directly giving drugs to patients. Polymers and their composites have found broad usage in the healthcare business due to their many beneficial properties. As a result, the application of 3D printing technology in the medical area has transformed the design and manufacturing of medical devices and prosthetics. Polymers and their composites have become attractive materials in this industry because of their unique mechanical, thermal, electrical, and optical qualities. This review article presents a comprehensive analysis of the current state-of-the-art applications of polymer and its composites in the medical field using 3D printing technology. It covers the latest research developments in the design and manufacturing of patient-specific medical devices, prostheses, and anatomical models for surgical planning and training. The article also discusses the use of 3D printing technology for drug delivery systems (DDS) and tissue engineering. various 3D printing techniques, such as stereolithography, fused deposition modeling (FDM), and selective laser sintering (SLS), are reviewed, along with their benefits and drawbacks. Legal and regulatory issues related to the use of 3D printing technology in the medical field are also addressed. The article concludes with an outlook on the future potential of polymer and its composites in 3D printing technology for the medical field. The research findings indicate that 3D printing technology has enormous potential to revolutionize the development and manufacture of medical devices, leading to improved patient outcomes and better healthcare services.

关键词： tissue engineering nanocomposite drug delivery systems (DDS) medicine 3D printing stereolithography fused deposition modeling (FDM)

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Monitoring the dependence of the photovoltaic properties of dye-sensitized solar cells from the structure of D-A-π-A-type sensitizers with a 9-(p-tolyl)-2,3,4,4a,9,9a-hexahydro-1H-1,4-methanocarbazole donor building block

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MOLECULAR SYSTEMS design & engineering 2022年第7期7卷 755-766页

作者： Gudim, Nikita S. Mikhailov, Maxim S. Knyazeva, Ekaterina A. Almenningen, David Moe Mikhalchenko, Ludmila, v Economopoulos, Solon P. Rakitin, Oleg A. Russian Acad Sci ND Zelinsky Inst Organ Chem Moscow 119991 Russia South Ural State Univ Nanotechnol Educ & Res Ctr Chelyabinsk 454080 Russia Norwegian Univ Sci & Technol Dept Chem N-7491 Trondheim Norway

The potential of dye-sensitized solar cells (DSSCs) based on synthesized D-A-pi-A-type dyes with a 9-(p-tolyl)-2,3,4,4a,9,9a-hexahydro-1H-1,4-methanocarbazole building block as a donor fragment was explored. The influence of the structure of the internal acceptor and of the pi-spacer on the optical and photovoltaic properties of the NIK series sensitizers was revealed. Dyes based on benzo[c][1,2,5]thiadiazole, which is a stronger electron-withdrawing unit than 2,3-diphenylquinoxaline, showed a bathochromic shift of the absorption band corresponding to intermolecular charge transfer, and incorporation of the 4,4-diethylhexyl-4H-cyclopenta[2,1-b:3,4-b ']dithiophene pi-bridge (NIK119) instead of thiophene (NIK88) resulted in the highest extinction coefficient among all the studied dyes in the Uv-vis spectra. The presence of branched alkyl substituents in NIK119 as well as in NIK99 did not allow reaching a high absorption of these sensitizers on a TiO2 surface, so the solar cells based on them showed low short-circuit current values and, as a consequence, a low power conversion efficiency (PCE). On the other hand, the absence of bulky groups in the structure of the sensitizer sharply increases charge recombination and dye aggregation, which causes the dramatic drop in PCE for NIK88. The optimal ratio between the concentration of dyes on a TiO2 surface and the electronic effects of individual blocks was achieved for the NIK97 dye based on unsubstituted 2,3-diphenylquinoxaline, for which a PCE value of 5.68% was obtained using CDCA as a co-adsorbent.

关键词： Titanium dioxide

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Renewing Fiber Optics Infrastructure on Mature Offshore Assets at Campos Basin

Renewing Fiber Optics Infrastructure on Mature Offshore Asse...

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Offshore Technology Conference, OTC 2025

作者： Ribeiro, H.L.v.F. Aloise, D. Silva, E.D. Siqueira, B.B. Nascimento, G.L. Davico, S.P. A B PETROBRAS RJ Rio de Janeiro Brazil

ISBN: (纸本)9781959025610

The "New Fiber Optic Network for Campos Basin" Project is a strategic initiative aimed at renewing the Campos Basin mature offshore assets' communication infrastructure. The project began as a business case proposition in 2020 and initiated the construction in 2024. It involves laying 500km fiber optic cables connecting two onshore stations, in Rio de Janeiro and Espírito Santo States to 12 stationary production units at depths of up to 1,800m, providing 100 Gbps links. The paper will describe all the steps in the project approval and deployment phases, including a technical description of the solutions selected for implementation, the risks associated with such choices, and how they are being mitigated. The first illumination is scheduled to take place in 2025, and as such the project is in an advanced completion stage, which shall provide valuable insights into the way in which the project is being implemented. The business case demonstrates the project strategic importance to assure investments returns by supporting the use of current and new technology on monitoring and controlling production and to assure operational safety from remote control rooms and real time integrated operation centers. The project is being executed through an engineering, procurement, construction, and installation (EPCI) contract, which is a comprehensive approach that covers the main aspects of the project from design to installation. During the initial phase, a thorough evaluation was conducted to determine the feasibility and value of investing in connectivity for mature field assets. This involved assessing the infrastructure ability to ensure actual increase of oil production. In the second phase, the project scope was detailed, designed, and the hiring strategy was defined. This phase took place in a post-pandemic booming market scenario and included not only the offshore installation of the optical fiber network but also necessary adjustments to the operating platforms and the de

关键词： Gas industry

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Microstructural Evolution in Nonvacuum Solid-State Diffusion Bonded Joints of AA2219

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Advances in Materials Science and engineering 2023年第1期2023卷

作者： vatnalmath, Manjunath Auradi, v. Bharath, v. Nagaral, Madeva Nagaraj, N. Lenin, A. Haiter Department of Mechanical Engineering Siddaganga Institute of Technology Visvesvaraya Technological University Karnataka Tumakuru572103 India Department of Mechanical Engineering Rns Institute of Technology Visvesvaraya Technological University Karnataka Bangalore560098 India Aircraft Research and Design Centre Hal Karnataka Bangalore560037 India Department of Mechanical Engineering Aps Polytechnic Karnataka Bangalore560082 India Department of Mechanical Engineering Wollo University Kombolcha Institute of Technology Post Box No. 208 Kombolcha Ethiopia

Solid-state diffusion bonding of AA2219 alloy is carried out under the nonvacuum condition to form AA2219/AA2219 joints. In the currently adopted method, AA2219 alloys are joined under the bonding temperature of 450-500°C, bonding pressure of 10 MPa, and bonding time of 30 min. Chemical cleaning is adopted to protect the joining surfaces from reoxidation before the diffusion bonding process. Microstructure evolution at the bonded joints is characterized using optical microscopy, scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The hardness at the bonded joints increased with the increase in the bonding temperature. The parent metal structure is achieved at 500°C bonding temperature with an increase in hardness of 112.14 Hv at the bond interface. There is no evidence of intermetallic found at the interface, as confirmed by X-ray diffraction (XRD). © 2023 Manjunath vatnalmath et al.

关键词： Hardness

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current scenario in ternary metal indium sulfides-based heterojunctions for photocatalytic energy and environmental applications: A review

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MATERIALS TODAY COMMUNICATIONS 2023年 36卷

作者： Sharma, Pankaj Kumar, Amit Zheng, Gege Mashifana, Tebogo Dhiman, Pooja Sharma, Gaurav Stadler, Florian J. Shoolini Univ Int Res Ctr Nanotechnol Himalayan Sustainabil IRCN Solan 173229 India Shenzhen Univ Coll Mat Sci & Engn Guangdong Res Ctr Interfacial Engn Funct Mat Shenzhen Key Lab Polymer Sci & Technol Shenzhen 518055 Peoples R China Univ Johannesburg Dept Chem Engn POB 17011 ZA-2088 Johannesburg South Africa

The mounting pressure of the energy crisis and environmental pollution has led to unprecedented developments in designing new age materials with superior properties for solar and visible light energy conversion. In light of this, semiconductor photocatalysts have been recognized the most preferred materials for the generation of clean energy and advanced water treatment. With strong visible light absorption, tuneable band width, low toxicity, excellent stability, and a longer lifetime of excited charge-carriers, indium sulphide and ternary metal indium sulphides (MISs) have high potential for applicability in fields of photocatalytic water detoxification, hydrogen evolution, and energy production. To harness the advantages to the fullest and address the inherent drawbacks, numerous metal indium sulphides, nanocomposites, and heterojunctions have been developed in addition to optical and defect engineering and hybridization. In this review, various synthetic routes for improved photo-catalytic performance are discussed, followed by discussions on Z-scheme, S-scheme, and p-n heterojunctions of metal indium sulfides. The most recent advances in the design and utilisation of metal indium sulfide-based heterostructures for photocatalytic applications in environmental contaminants degradation and energy con-version are then summarised. Lastly, some future prospective and future recommendations for photocatalytic activity are discussed. Finally, the challenges, outlook, and research directions for designing superior next-generation MISs-based photocatalysts are discussed.

关键词： Metal indium sulfide Photocatalysis Heterojunctions Water treatment H2 generation

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一种大电流DDR终端线性稳压器的设计

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固体电子学研究与进展 2022年第3期42卷 207-213页

作者：夏晓娟庄玉成易磊杨琨南京邮电大学电子与光学工程学院微电子学院南京210023 南京邮电大学射频集成与微组装技术国家地方联合工程实验室南京210023 南京微盟电子有限公司南京210042

设计了一款可吐纳3 A大电流的跟踪终端线性稳压器。该稳压器采用双电源供电,降低了芯片的功耗。内部误差放大器采用轨到轨输入结构设计,拓展了稳压器输入共模电压范围;同时采用跨导线性环电路结构和简单补偿电路结构的设计,使其在负载... 详细信息

设计了一款可吐纳3 A大电流的跟踪终端线性稳压器。该稳压器采用双电源供电,降低了芯片的功耗。内部误差放大器采用轨到轨输入结构设计,拓展了稳压器输入共模电压范围;同时采用跨导线性环电路结构和简单补偿电路结构的设计,使其在负载突变时提供快速的负载瞬态响应,减小输出过冲。输出级上下功率管采用NMOS推挽式输出,可提供1 A/2 A/3 A的大电流,极大提高了稳压器的带载能力。该稳压器能够满足DDRⅠ/Ⅱ/Ⅲ和低功耗DDRⅢ/Ⅳ总线终端对电源供应的要求。采用华虹0.35μm工艺流片,在两个输入电压v_(IN)、v_(LDOIN)分别为5 v、2.5 v条件下进行测试,输出/吸收3 A负载电流时,输出稳定在1.25 v。

关键词：线性稳压器输出过冲大电流

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Terahertz Photoconductive Antenna Based on Tai-Chi Totem and Plasmonic Structure for Cancer Detection

Terahertz Photoconductive Antenna Based on Tai-Chi Totem and...

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International Conference on Wireless Networks and Mobile Communications (WINCOM)

作者： Ruobin Han Abdoalbaset Abohmra Tomas Pires vaithinathan Karthikeyan Farooq A. Tahir Joao Ponciano Muhammad Imran Qammer Abbasi James Watt School of Engineering Glasgow University Glasgow UK School of Science and Technology Hong Kong Metropolitan University Ho Man Tin Hong Kong Artificial Intelligence Research Centre Ajman University Ajman UAE

ISBN: (数字)9798350377866

ISBN: (纸本)9798350377873

The asymptomatic nature of cancer in its early stages has been a major problem in medical research. Terahertz (THz) radiation has great potential in cancer detection due to its outstanding properties of non-ionization, non-invasion, and accuracy. As an auspicious THz radiation source, the photoconductive antenna (PCA) is now becoming adopted in investigating and analyzing THz applications. In this paper, a fabricable novel structure of THz PCA working on THz band is proposed. The design of plasmonic contact fingers is applied to the antenna gap in order to improve the efficiency by enhancing the absorption of surface current, leading to a larger THz radiation. The proposed design is analysed and compared to the conventional design, indicating that the directivity and E-field magnitude of the proposed work are significantly improved in range of 0.3 to 0.6 THz, up to 7.33 dBi and 20.33 v/m. The E-field distribution inside the structure and at the electrodes-substrate interface is provided to show the superior optical absorption by the plasmonic contact fingers. The proposed PCA fulfils the requirements of cancer detection and other medical biosensing scenarios.

关键词： Fingers Terahertz radiation Bandwidth Mobile antennas Plasmons Cancer detection Biosensors

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Condition monitoring of current media using a differential refractometer 8

Condition monitoring of current media using a differential r...

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8th International School and Conference "Saint Petersburg OPEN 2021" on Optoelectronics, Photonics, engineering and Nanostructures, SPbOPEN 2021

作者： Svyatkina, v.I. Davydov, v.v. Rud, v.Y. Peter the Great Saint-Petersburg Polytechnic University Saint Petersburg195251 Russia All-Russian Research Institute of Phytopathology Moscow Region 143050 Russia A.F. Ioffe Physicotechnical Institute St. Petersburg195152 Russia

A new design of a differential flow refractometer has been developed to monitor the condition of flowing media in a pipeline. A new method of refractive index measurement has been implemented, taking into account the specifics of flowing and closed cuvette arrangement, as well as the angles of incidence of laser radiation on their walls. The effect of changes in the optical density in the flowing liquid on the refractive index measurement result is determined. The results of experimental investigations of different media are presented. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Refractometers

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Suppressing non-radiative generation and recombination in LEDs, Pvs, and photodiode detectors via inhomogeneous doping around the depletion region co-located with a heterojunction 3

Suppressing non-radiative generation and recombination in LE...

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Photonic Heat Engines: Science and Applications III 2021

作者： Santhanam, Parthiban Fan, Shanhui Ginzton Laboratory Department of Electrical Engineering Stanford University StanfordCA94305 United States

ISBN: (数字)9781510642409

ISBN: (纸本)9781510642393

We present a design principle for photonically-active double-heterojunction (DHJ) diodes that utilizes spatial control over the distribution of dopant impurities in the growth direction to suppress non-radiative Shockley-Read-Hall (SRH) carrier generation and recombination processes. These non-radiative processes constitute major parasitics in numerous devices, including light-emitting diodes (LEDs), photovoltaics (Pvs), and photo-diode detectors (PDs). The design principle is general to all diodes with carrier-confining heterojunctions and is agnostic to material system. As a result, devices based on semiconductors in Group Iv (e.g. SiGe), III-v (e.g. GaN, AlGaAs, GaInAsP, GaInAsSb), II-vI (e.g. MgZnCdTe, ZnCdSeS), and others can theoretically benefit from it. To illustrate the principle, here we will model LEDs, Pvs, and PDs in the InP-lattice-matched GaInAsP material system. We show that LEDs' Internal Quantum Efficiency (IQE) is raised, with a major impact at low forward bias voltages. The modeling presented here shows that, because thermophotonic refrigerator LEDs operate at these voltages, the design principle could prove to be a major step toward realizing the Kelvinscale and larger temperature reductions that have remained experimentally elusive to date. Next, we show that redesigned Pvs exhibit higher open-circuit voltage and efficiency, with significant improvement in cells with the high defect densities typical of lattice mismatched III-v cells grown on inexpensive Silicon substrates. Finally, we show that PDs exhibit improvements in dark current during reverse bias operation and shunt resistance during photovoltaic operation, quantities that can impact the noise floor of receivers in optical communication systems and thus the overall power consumption of photonic links. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Heterojunctions

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