Current Applied Physics最新文献

{"title":"Composition dependence of the orbital torque in CoxFe1−x and NixFe1−x alloys: Spin-orbit correlation analysis","authors":"Hojun Lee,&nbsp;Hyun-Woo Lee","doi":"10.1016/j.cap.2024.07.014","DOIUrl":"10.1016/j.cap.2024.07.014","url":null,"abstract":"<div><p>The spin-orbit correlation in ferromagnet (FM) is an important factor that affects the orbital torque efficiency in the FM. We investigate the spin-orbit correlation in FM alloys, <span><math><msub><mrow><mtext>Co</mtext></mrow><mrow><mi>x</mi></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span> and <span><math><msub><mrow><mtext>Ni</mtext></mrow><mrow><mi>x</mi></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>1</mn><mo>−</mo><mi>x</mi></mrow></msub></math></span>, with varying their composition. We find spots where the spin-orbit correlation is significantly strong near the Fermi surface in <span><math><msub><mrow><mtext>Co</mtext></mrow><mrow><mn>0.125</mn></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>0.875</mn></mrow></msub></math></span>, <span><math><msub><mrow><mtext>Co</mtext></mrow><mrow><mn>0.25</mn></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>0.75</mn></mrow></msub></math></span>, <span><math><msub><mrow><mtext>Co</mtext></mrow><mrow><mn>0.875</mn></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>0.125</mn></mrow></msub></math></span>, and <span><math><msub><mrow><mtext>Ni</mtext></mrow><mrow><mn>0.5</mn></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>0.5</mn></mrow></msub></math></span>, while no such spot appears in <span><math><msub><mrow><mtext>Co</mtext></mrow><mrow><mn>0.5</mn></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>0.5</mn></mrow></msub></math></span>, and <span><math><msub><mrow><mtext>Ni</mtext></mrow><mrow><mn>0.75</mn></mrow></msub><msub><mrow><mtext>Fe</mtext></mrow><mrow><mn>0.25</mn></mrow></msub></math></span>. These results imply that in the former structures, the orbital polarized current injected into these spots can provide a strong torque to the magnetization of the FM through the orbital torque mechanism. These results also show that even in the same alloy system, the difference in alloy composition can lead to different orbital torque efficiency.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"67 ","pages":"Pages 60-68"},"PeriodicalIF":2.4,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141845901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Linearizing AFM raster scans acquired using dual-stage lateral scanners","authors":"Oyoo Michael Juma ,&nbsp;Luke Oduor Otieno ,&nbsp;Thi Thu Nguyen,&nbsp;Thi Ngoc Nguyen,&nbsp;Yong Joong Lee","doi":"10.1016/j.cap.2024.07.015","DOIUrl":"10.1016/j.cap.2024.07.015","url":null,"abstract":"<div><p>Dual-stage scanners can successfully increase the range of atomic force microscope (AFM) scanners in space and/or frequency by designing and constructing two nanopositioners with significant differences in static and dynamic characteristics. In such cases, the positioning signal has to be split to meet the displacement and frequency limitations of each stage. Without closed-loop displacement measurement sensors, linearizing images acquired using signals split in time and frequency can be challenging. A common method, often cumbersome and time consuming, uses inverse model-based feedforward compensation. In this work, we show that image-based linearization can be used to achieve acceptable results for raster scans acquired using dual-stage scanners. In particular, we apply the feedforward and image-based methods to our homemade dual-stage lateral scanner and high-speed AFM (HS-AFM) system. The acquired scans compare well for the two methods, indicating that image-based raster scan linearization can be used in place of inverse model-based feedforward approaches.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"67 ","pages":"Pages 46-53"},"PeriodicalIF":2.4,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141838736","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Web-based applications for automated generation of functionalized graphene and carbon nanotube for molecular dynamics simulations and automated three-dimensional analysis of ion flow through nanopores","authors":"Gyeongpil Jo ,&nbsp;Minsoo Kim ,&nbsp;Jinmin Lee ,&nbsp;Sang Hak Lee ,&nbsp;Jejoong Yoo","doi":"10.1016/j.cap.2024.07.011","DOIUrl":"10.1016/j.cap.2024.07.011","url":null,"abstract":"<div><p>Functionalized graphene and carbon nanotubes (CNTs) are widely recognized for their exceptional physical properties, which make them highly suitable for various applications. Although molecular dynamics (MD) simulations are essential for investigating the atomic-level interactions and transport phenomena in functionalized graphene and CNT systems, setting up these simulations remains complex and time-consuming. To streamline this process, we have developed a novel web application that automates the generation of MD simulation setups of functionalized graphene and CNT systems compatible with AMBER force fields and the Gromacs software. Key features include the creation of nanopores, functionalization with hydrogen, hydroxyl, and/or carboxylate groups, and the application of periodic boundary conditions to effectively simulate infinite structures. To facilitate the MD analysis of transport phenomena through nanopores, our web application offers an automated analysis tool that generates and visualizes three-dimensional local flux fields from MD trajectories. Overall, our web applications significantly enhance the accessibility and efficiency of MD simulations of functionalized graphene systems, particularly for nanopore applications. Our web applications are freely available at <span><span>https://yoo.skku.edu/apps</span><svg><path></path></svg></span>.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"67 ","pages":"Pages 30-37"},"PeriodicalIF":2.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Components and defect density optimization of FAxMA1-xPbI3 based on simulation for high performance perovskite solar cells","authors":"Jie Su ,&nbsp;Suxia Liang ,&nbsp;Zhiguo Zhao ,&nbsp;Tianyu Yu ,&nbsp;Sheng Zou ,&nbsp;Yunlei Jiang ,&nbsp;Cang Liang ,&nbsp;Mi Zhang ,&nbsp;Wangfan Chen ,&nbsp;Lei Shi ,&nbsp;Yukun Guo ,&nbsp;YongGang Yu ,&nbsp;Yuan Dong","doi":"10.1016/j.cap.2024.07.013","DOIUrl":"10.1016/j.cap.2024.07.013","url":null,"abstract":"<div><p>Choosing FA⁺/MA⁺ mixed-ion perovskite material as the active layer of the perovskite solar cells hold out the prospect of high efficiency and high stability. In this paper, the FA⁺/MA ⁺ ratio is modified to optimize the performance of FA_xMA_1-xPbI₃-based perovskite solar cells utilizing SCAPS-1D. The results indicate that the PCE of the devices reached a minimum of 21 % when x is greater than or equal to 0.6 in FA_xMA_1-xPbI₃(FTO/NiO_x/FA_xMA_1-xPbI₃/C₆₀/BCP/Al). When x = 0.6, the impact of the bottom interface defects on the solar cell performance is dominant and the thickness of the active layer should be controlled within a range of 0.4 μm–0.8 μm, while the defect density of the layer is expected to be between 10¹³ 1/cm³ and 10¹⁴ 1/cm³. By optimizing the perovskite layer thickness, defect density and changing the type of back electrode material, the efficiency is reaching 25.74 % based on the device(FTO/NiO_x/FA₆MA₄PbI₃/C₆₀/BCP/Au). This study provides theoretical guidance for experimental research on interface modification, defect passivation and manufacturing of high-efficiency FA_xMA_1-xPbI₃-based perovskite solar cells.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"67 ","pages":"Pages 38-45"},"PeriodicalIF":2.4,"publicationDate":"2024-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interlinking the Fe doping concentration, optoelectronic properties, and photocatalytic performance of ZnO nanostructures","authors":"Amugul Esbergenova ,&nbsp;Mirabbos Hojamberdiev ,&nbsp;Zukhra C. Kadirova ,&nbsp;Yuichi Sugai ,&nbsp;Shavkat Mamatkulov ,&nbsp;Rivojiddin Jalolov ,&nbsp;Debin Kong ,&nbsp;Xin Qin ,&nbsp;Shahlo S. Daminova ,&nbsp;Olim Ruzimuradov ,&nbsp;Ulugbek Shaislamov","doi":"10.1016/j.cap.2024.07.009","DOIUrl":"10.1016/j.cap.2024.07.009","url":null,"abstract":"<div><p>Doping is one of the effective strategies to modulate the optoelectronic properties and photocatalytic activity of photocatalysts. In this study, the effect of Fe doping (0–10 %) on morphology, optical and electronic properties, and photocatalytic activity of ZnO nanostructures is studied. The X-ray diffraction analysis shows that &gt;5 % Fe doping, ZnFe₂O₄ is segregated as a secondary phase. The crystalline size decreases from 50.8 nm to 21.4 nm and the micro-strain increases with increasing the Fe concentration. The Fe doping-induced electronic restructuring facilitates visible light absorption through the O 2p → Fe 3d transition and the suppression of charge recombination by efficiently trapping conduction band electrons. Density functional theory (DFT) calculations are employed to unravel the underlying electronic changes induced by Fe doping in ZnO. The formation of shallow donor levels below the conduction band originates from the Fe 3d state. Photoluminescence spectra of pristine and Fe-doped ZnO nanostructures show characteristic emission peaks at approximately 384 nm and 570 nm, indicating the recombination of free excitons and oxygen interstitial defects, respectively. The results of the photocatalytic activity tests confirm that the 1 % Fe-doped ZnO nanostructures can exhibit the highest efficiency compared to the heavily doped ZnO nanostructures. The high efficiency in photocatalytic activity of 1 % Fe-doped ZnO nanostructures is ascribed to the modulated electronic structure and defect density. The adsorption affinity of methylene blue and water molecules to the surfaces of pristine and Fe-doped ZnO is simulated using the Monte-Carlo method. This study emphasizes the importance of controlling the dopant concentration to enhance the photocatalytic activity of various photocatalysts.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"67 ","pages":"Pages 18-29"},"PeriodicalIF":2.4,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141776778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sampling rare events using nanostructures for universal Pt neural network potential","authors":"Joonhee Kang ,&nbsp;Byung-Hyun Kim ,&nbsp;Min Ho Seo ,&nbsp;Jehyun Lee","doi":"10.1016/j.cap.2024.07.005","DOIUrl":"https://doi.org/10.1016/j.cap.2024.07.005","url":null,"abstract":"<div><p>The density functional theory (DFT) data-driven approach to generating potential energy surfaces using machine learning has been proven to quickly and accurately predict the molecular and crystal structures of various elements. However, training databases consisting of hundreds of well-known symmetric structures have shown fatal weaknesses in calculating amorphous or nano-scale structures. Ab-initio molecular dynamics (AIMD) simulations create a training set that compensates for these shortcomings, but there are still many rare event structures. Here we introduce a new method to easily enlarge the data diversity and dramatically reduce data points based on the highly defected nano structures for universal machine learned potential. Our potential applies to bulk and nano systems and has been shown to high accuracy and computational efficiency while requiring minimal DFT training data. The developed potential is expected to help observation of structural changes in the Pt-based nano-catalysts that have been difficult to simulate at the DFT-level.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"66 ","pages":"Pages 110-114"},"PeriodicalIF":2.4,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Next-generation DNA-enhanced electrochemical energy storage: Recent advances and perspectives","authors":"Xiong Cheng,&nbsp;Joonho Bae","doi":"10.1016/j.cap.2024.07.007","DOIUrl":"10.1016/j.cap.2024.07.007","url":null,"abstract":"<div><p>In recent years, electrochemical energy storage devices, including lithium batteries, supercapacitors, and fuel cells, have surged in development. They play indispensable roles across various domains and significantly enhance the quality of life. Electrochemical energy storage is vital to power systems, managing supply and demand dynamics, mitigating challenges such as intermittent energy fluctuations, and fostering the sustainable advancement of clean energy solutions. Among burgeoning research avenues, DNA is a green biological macromolecule with biodegradability and a unique double-helix structure, attracting attention across diverse fields. This review discusses the myriad applications of DNA in electrochemical energy storage devices and offers insights into novel approaches to leveraging DNA for electrochemical applications. Exploring these potential applications of DNA may unlock innovative pathways to enhancing the efficiency, sustainability, and versatility of electrochemical energy storage technologies. As these efforts continue, DNA promises to transform the ongoing quest for robust and eco-friendly energy solutions.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"67 ","pages":"Pages 1-17"},"PeriodicalIF":2.4,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141637997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transparent CdSe/ZnS quantum-dot light-emitting diodes with WOx/Ag/WOx transparent electrodes achieving higher efficiency than opaque quantum-dot light-emitting diodes","authors":"Jimyoung Kim,&nbsp;Honyeon Lee","doi":"10.1016/j.cap.2024.07.006","DOIUrl":"10.1016/j.cap.2024.07.006","url":null,"abstract":"<div><p>High-performance transparent quantum-dot light-emitting diodes (TQLEDs) are achieved through fine-tuning the top dielectric/metal/dielectric (DMD) anode structure. The transparent DMD electrodes are utilized as both the bottom cathode and top anode of TQLEDs. Employing WO_x/Ag/WO_x DMD anodes serves a dual purpose of transparency and hole injection, thereby streamlining the TQLED design. Investigation into the effects of the thicknesses of WO_x and Ag layers on the device characteristics reveals an optimal configuration of 10-nm WO_x/27-nm Ag/40-nm WO_x for the DMD anode. The resulting TQLED exhibits a remarkable device light transmittance of 47 % at 530 nm. With maximum bottom and top emission current efficiencies of 34.0 and 9.42 cd/A, respectively, the total emission obtained by summing the bottom and top emissions reaches the maximum current efficiency of 41.8 cd/A, surpassing that of conventional opaque quantum-dot light-emitting diodes. This advancement underscores the successful fabrication of TQLEDs boasting higher efficiency alongside substantial light transmittance.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"66 ","pages":"Pages 122-130"},"PeriodicalIF":2.4,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141630537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cohesively improved conductivity, transparency, and stability of Ag NW flexible transparent conductive thin films by covering Al2O3 layer","authors":"Mengqing Hu ,&nbsp;Zheng Sun ,&nbsp;Zhengjun Qiu ,&nbsp;Le Zhao ,&nbsp;Lijun Song ,&nbsp;Qingchen Dong ,&nbsp;Shihui Yu","doi":"10.1016/j.cap.2024.07.003","DOIUrl":"10.1016/j.cap.2024.07.003","url":null,"abstract":"<div><p>Developing feasible Ag nanowire (NW) transparent conductive thin films (TCFs) with good conductivity, transparency, mechanical durability, strong adhesion, and high stability is a great challenge. Herein, novel TCFs composed of Ag NWs/Al₂O₃ on polyethylene terephthalate (PET) substrates with synchronously improved conductivity, transparency, mechanical durability, adhesion, and stability, are prepared. The corresponding values (before coating Al₂O₃: 13.0 Ω/sq. at 86.1 %, after coating Al₂O₃: 11.7 Ω/sq. at 87.7 %) indicate that the deposition of Al₂O₃ enhances the transparency and conductivity of Ag NW networks. Moreover, the resistance does not change significantly after 50 taping cycles and 2000 bending cycles with a bending radius of 5.0 mm, indicating the strong adhesion and good mechanical flexibility of Al₂O₃/Ag NWs composites. In addition, Al₂O₃/Ag NWs composites possess excellent stability to resist strong oxidizing, hot and humid environments. As a proof of concept, the flexible transparent heater prepared by Al₂O₃/Ag NWs composites is successfully demonstrated, verifying the practicability.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"66 ","pages":"Pages 115-121"},"PeriodicalIF":2.4,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141630536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two-step preparation of methylammonium lead triiodide perovskite film via electrospray deposition of methylammonium iodide solution for solar cell applications","authors":"Nahyun Kim,&nbsp;Jaewon Ahn,&nbsp;Moonseok Ko,&nbsp;Seungsun Choi,&nbsp;Wonsik Kim,&nbsp;Woojin Shin,&nbsp;Sehyun Jung,&nbsp;Hyesung Oh,&nbsp;Muntae Hwang,&nbsp;Mee-Yi Ryu,&nbsp;Hyunbok Lee","doi":"10.1016/j.cap.2024.07.004","DOIUrl":"https://doi.org/10.1016/j.cap.2024.07.004","url":null,"abstract":"<div><p>Solution-processable perovskite solar cells (PSCs) have the potential to revolutionize solar cell technology by enabling low power generation costs via low-cost device fabrication. However, most existing research regarding PSCs relies on the spin-coating method, which is not conducive to large-area film deposition. Therefore, the development of an alternative deposition method for perovskite films has become increasingly important for commercialization, for which electrospray deposition is a promising technique. This study investigates the two-step preparation of methylammonium lead triiodide (MAPbI₃) perovskite films via the electrospray deposition of a methylammonium iodide (MAI) solution on a spin-coated PbI₂ film. The gradual conversion of PbI₂ to MAPbI₃ with increasing MAI deposition time was revealed, accompanied by an increase in the size of the perovskite crystals. In addition, PSCs were successfully fabricated by electrospraying MAI, achieving a considerable power conversion efficiency of 7.86 % at the optimal MAI deposition time.</p></div>","PeriodicalId":11037,"journal":{"name":"Current Applied Physics","volume":"66 ","pages":"Pages 88-94"},"PeriodicalIF":2.4,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}