Applied Physics Letters最新文献_第6页

Temperature-dependent random telegraph signal in Co/CoO/Co point contact devices

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-27 DOI: 10.1063/5.0248880

Zhongyang Ren, Muchan Li, Jiaojiao Tian, Chenhao Xia, Liming Ren, Fei Liu, Yunyi Fu

引用次数: 0

Boosting low-pressure reversible barocaloric effect in plastic crystal KPF6 through controlled particle size

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-27 DOI: 10.1063/5.0247473

Ziqi Guan, Changjiang Bao, Jiaqi Liu, Zhao Zhang, Haoyu Wang, Kun Zhang, Yanxu Wang, Yunlong Tang, Bing Li

{"title":"Boosting low-pressure reversible barocaloric effect in plastic crystal KPF6 through controlled particle size","authors":"Ziqi Guan, Changjiang Bao, Jiaqi Liu, Zhao Zhang, Haoyu Wang, Kun Zhang, Yanxu Wang, Yunlong Tang, Bing Li","doi":"10.1063/5.0247473","DOIUrl":"https://doi.org/10.1063/5.0247473","url":null,"abstract":"Plastic crystals have large entropy change during first-order phase transitions due to strong molecular orientation disorder and volume changes. This feature has revived interest in plastic crystals, as they have great potential in solid-state refrigeration applications induced by external pressure. However, the reversible barocaloric effect in most plastic crystals does not compare favorably with their isothermal entropy change. Here, we demonstrate that controlling the particle size of the plastic crystal KPF6 can help achieve a compromise between the phase transition resistance at grain boundaries and the phase transition correlation within grains and induce a giant reversible barocaloric effect at low pressure. In particular, the 75–150 μm plastic crystal KPF6 displays the lowest thermal hysteresis, with a giant reversible barocaloric entropy change of 50.0 J · kg−1 · K−1 under a pressure change of 40 MPa. The reversible barocaloric effect can be more than doubled by simply optimizing the microstructures of the plastic crystal KPF6. Our work provides an effective way to enhance the reversible barocaloric effect in plastic crystal materials. We also give insight into the physical mechanism that enhances the reversible barocaloric effect through transmission electron microscopy analysis.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"40 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Thermodynamic coupling in micro-nanocavity graphene/paraffin phase change energy storage materials under impact loading

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-27 DOI: 10.1063/5.0249953

Yuhao Wang, Junhong Yu, Wentian Huang, Jun Di, Jinming Cai, Jianbo Hu

{"title":"Thermodynamic coupling in micro-nanocavity graphene/paraffin phase change energy storage materials under impact loading","authors":"Yuhao Wang, Junhong Yu, Wentian Huang, Jun Di, Jinming Cai, Jianbo Hu","doi":"10.1063/5.0249953","DOIUrl":"https://doi.org/10.1063/5.0249953","url":null,"abstract":"Micro-nanocavity graphene/paraffin nanocomposites (MNGPNs) are emerging as promising phase change materials for passive thermal management in electronics, utilizing the superior thermal conductivity of graphene in conjunction with the excellent heat storage capacity of paraffin. However, current assessments of MNGPNs thermal management performance are primarily conducted under laboratory static conditions, which do not fully represent the complex overload environments encountered in practical applications. In this study, we conducted strain freezing experiments using a split Hopkinson pressure bar and performed recovery analysis to investigate the influence of dynamic loading on thermal behavior through postmortem microstructural characterizations. Our findings reveal significant thermodynamic coupling effects in the in-plane direction, while coupling effects in the out-of-plane direction were less apparent. Specifically, the increase in internal thermal resistance under impact loading, due to the cracking, shedding, and directional changes in the graphene structure, diminishes the heat transfer capacity of MNGPNs in the in-plane direction. Alternations in interfacial thermal resistance caused by the layer compression and shedding affect the out-of-plane heat transfer capacity. Furthermore, the thermal behavior of MNGPNs was validated through heat dissipation experiments. This work provides valuable insights for the practical thermal management applications of MNGPNs, highlighting their performance from a dynamic perspective.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"238 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Polymer-integrated optical fiber Fabry–Pérot interferometer with Vernier effect for the detection of myoglobin

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-27 DOI: 10.1063/5.0251539

Zhuoyang Han, Xuanyi Chen, Yinping Miao, Yangyuan Zhang, Changping Xu

{"title":"Polymer-integrated optical fiber Fabry–Pérot interferometer with Vernier effect for the detection of myoglobin","authors":"Zhuoyang Han, Xuanyi Chen, Yinping Miao, Yangyuan Zhang, Changping Xu","doi":"10.1063/5.0251539","DOIUrl":"https://doi.org/10.1063/5.0251539","url":null,"abstract":"Acute myocardial infarction (AMI) is the most severe manifestation of coronary artery disease and one of the leading causes of morbidity and mortality worldwide. The concentration of myoglobin (Mb) in serum has been regarded as an essential indicator for the early diagnosis of AMI. Developing a rapid, sensitive, and accurate Mb detection method is very important for the early diagnosis of AMI. This study reports a fiber optic biosensor based on polymer and Vernier effect composite sensitization for real-time detection of serum Mb concentration. The sensor is made of a Fabry–Pérot interferometer cascade tapered microfiber filled with photothermal material polydimethylsiloxane. Two interference structures with similar but unequal free spectral range are combined, and the superposition spectrum produces periodic interference fringes, forming a fiber sensor with a Vernier effect. By detecting the photothermal signal generated by the absorption of light by Mb, marker-free, specific detection can be achieved. The sensing device attained a sensitivity of 5.235 nm/(mg/L) in the 0.0001–10 mg/L concentration range. The linearity reached 0.9978, with a limit of detection of 3.82 ng/ml, which meets the sensitivity requirements for detecting Mb concentration in serum, and the detection time was less than 40 s, which has potential in the early diagnosis of related diseases.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"32 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143518552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

One-step fabrication of sharp platinum/iridium tips via amplitude-modulated alternating-current electropolishing

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-26 DOI: 10.1063/5.0251481

Yuto Nishiwaki, Toru Utsunomiya, Shu Kurokawa, Takashi Ichii

{"title":"One-step fabrication of sharp platinum/iridium tips via amplitude-modulated alternating-current electropolishing","authors":"Yuto Nishiwaki, Toru Utsunomiya, Shu Kurokawa, Takashi Ichii","doi":"10.1063/5.0251481","DOIUrl":"https://doi.org/10.1063/5.0251481","url":null,"abstract":"The platinum/iridium (Pt/Ir) alloy tip for scanning probe microscopy was fabricated by amplitude-modulated alternating-current electropolishing. The clean tips with a radius of curvature less than 100 nm were reproducibly obtained by applying the sinusoidal voltage in the frequency (f0) of 900 Hz≤f0≤1500 Hz with amplitude modulation by the sinusoidal wave in the modulation frequency (fs) of fs=0.1f0 in CaCl2/H2O/acetone solution. The analyses by scanning electron microscopy with an energy-dispersive x-ray analyzer and atom probe tomography showed that a uniform Pt/Ir alloy was exposed on the tip surface as a clean surface without O or Cl contamination. The scanning tunneling microscopy (STM) imaging using the fabricated tip showed that it is more suitable for investigating rough surfaces than conventional as-cut tips and applicable for atomic-resolution imaging. Furthermore, we applied the fabricated tip to qPlus atomic force microscopy (AFM) analysis in liquid and showed that it has atomic resolution in both the horizontal and vertical directions. Therefore, it is concluded that the amplitude-modulated AC etching method reproducibly provides sharp STM/AFM tips capable of both atomic resolution and large-area analyses without complex etching setups.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"51 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Band structure modulation of chalcogenide perovskite with Eu as A-site cation

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-26 DOI: 10.1063/5.0256891

Yanbing Han, Jiao Fang, Xiaoyang Xing, Han Gao, Jibin Zhang, Yuewen Zhang, Yifang Yuan, Jie Yang, Shunfang Li, Zhifeng Shi

{"title":"Band structure modulation of chalcogenide perovskite with Eu as A-site cation","authors":"Yanbing Han, Jiao Fang, Xiaoyang Xing, Han Gao, Jibin Zhang, Yuewen Zhang, Yifang Yuan, Jie Yang, Shunfang Li, Zhifeng Shi","doi":"10.1063/5.0256891","DOIUrl":"https://doi.org/10.1063/5.0256891","url":null,"abstract":"Chalcogenide perovskites with distorted structures, such as BaZrS3 and SrZrS3, are promising photovoltaic materials due to their high stability, strong absorption, and excellent electrical transport properties. Researchers have explored BaZr1-xTixS3 and BaZrS3-xSex alloys to reduce their band gaps, allowing them to absorb lower-energy photons. However, the hexagonal structures of BaTiS3 and BaZrSe3, along with the incompatibility of Ti or Se atoms in BaZrS3, lead to phase separation in these alloys. In this work, using EuZrS3 and Sr0.7Eu0.3ZrS3 alloys as examples, we demonstrate that the band structure of chalcogenide perovskites can be tuned by using Eu as the A-site cation. In EuZrS3, the Eu 4f orbitals contribute to the valence band maximum, thereby raising the valence band and resulting in a narrow bandgap of 0.54 eV. Furthermore, due to the structural and atomic compatibility of Eu with SrZrS3, the Sr1-xEuxZrS3 alloy is designed to fine-tune the band structures of both SrZrS3 and EuZrS3. EuZrS3 also exhibits typical semiconducting characteristics, making it promising for potential optoelectronic devices.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"26 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

A coplanar electrode operating mode for piezoelectric energy harvesting and self-powered sensing

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-26 DOI: 10.1063/5.0252426

Jian Hao, Ping Liu, Guanglong Gao, Qingguo Gao, Jianjun Yang, Liming Liu

{"title":"A coplanar electrode operating mode for piezoelectric energy harvesting and self-powered sensing","authors":"Jian Hao, Ping Liu, Guanglong Gao, Qingguo Gao, Jianjun Yang, Liming Liu","doi":"10.1063/5.0252426","DOIUrl":"https://doi.org/10.1063/5.0252426","url":null,"abstract":"Piezoelectric semiconductors have emerged as a prominent area of research in recent years due to their unique combination of piezoelectric and semiconductor properties. In this Letter, we propose a piezoelectric device structure featuring coplanar electrodes positioned above the piezoelectric layer. We have conducted a detailed theoretical analysis of the piezoelectric properties of this piezoelectric device. By utilizing a coplanar electrode piezoelectric mode, pressure applied to one electrode generates a potential difference between the two electrodes. Notably, the piezoelectric performance of the device can be adjusted by modifying its structure. Numerical simulations and experimental results indicate that the piezoelectric performance reaches an optimal value when the distance between the electrodes is equal to one-half of the electrode length. Additionally, we have developed a method to enhance the piezoelectric voltage output capability of the device under low load resistance conditions. Specifically, by introducing charge carriers into the piezoelectric layer from the doped silicon substrate, the device's resistance is reduced due to the Schottky contact. The piezoelectric operating mode proposed in this paper facilitates energy harvesting and self-powered sensing, distinguishing it from the d31 and d33 operational modes associated with traditional sandwich device structures, thereby allowing for more versatile device configurations.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"66 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143506939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Signal-noise analysis of miniaturized delta-E effect magnetic field sensors

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-26 DOI: 10.1063/5.0238427

Fatih Ilgaz, Elizaveta Spetzler, Patrick Wiegand, Franz Faupel, Robert Rieger, Jeffrey McCord, Benjamin Spetzler

{"title":"Signal-noise analysis of miniaturized delta-E effect magnetic field sensors","authors":"Fatih Ilgaz, Elizaveta Spetzler, Patrick Wiegand, Franz Faupel, Robert Rieger, Jeffrey McCord, Benjamin Spetzler","doi":"10.1063/5.0238427","DOIUrl":"https://doi.org/10.1063/5.0238427","url":null,"abstract":"Delta-E effect sensors developed for detecting small amplitude and low-frequency magnetic fields have shown potential for miniaturization. However, a comprehensive signal-and-noise analysis of such miniaturized sensors is lacking. Here, we present an in-depth study of the key performance characteristics of sub-millimeter-sized delta-E effect sensors with a double-wing resonator geometry. Several resonance modes are evaluated for their sensitivity, noise, and limit of detection (LoD) as functions of the excitation voltage amplitude and magnetic bias flux density. We identify and discuss the optimal conditions for sensor operation and compare the performance to that of the reported macroscopic devices. While all investigated resonance modes behave qualitatively similar, quantitative differences in signal and noise lead to an almost sevenfold difference in LoD s. The performance is limited by magnetic noise at large excitation amplitudes and, unlike reported macroscopic delta-E effect sensors, by noise from the excitation signal and charge amplifier at low excitation amplitudes. The best performance is achieved in the third resonance mode excited at 683 kHz with a LoD≤7.4±3 nT/Hz between 10 and 1000 Hz and a minimum of 2.8 nT/Hz at 195 Hz. This demonstrates an improvement over previously reported values for miniaturized delta-E effect sensors in this frequency range. Moreover, the sensors show a −3 dB bandwidth of ≈440 Hz, which is significantly wider compared to macroscopic delta-E effect sensors. Reducing electronic noise and employing advanced magnetic multilayers can further improve the LoD, making these miniaturized sensors promising candidates for compact arrays.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"17 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Electric field-induced depolarization of direct current and alternating current poled PMN-PT single crystals

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-26 DOI: 10.1063/5.0250172

Jeong-Woo Sun, Zhengze Xu, Sang-Goo Lee, Wook Jo, Xiaoning Jiang, Jong Eun Ryu

引用次数: 0

Enhancing CZTSSe solar cell efficiency to 11.07% with NaClO-induced Mo texturing for improved light management and carrier collection

IF 4 2区物理与天体物理

Applied Physics Letters Pub Date : 2025-02-26 DOI: 10.1063/5.0252478

Yunjie Bai, Yu He, Yuhao Zhang, Chu Liu, Jingqi Qiao, Hongmei Luan, Yanchun Yang, Bin Yao, Yanping Song, Ruijian Liu, Chengjun Zhu

{"title":"Enhancing CZTSSe solar cell efficiency to 11.07% with NaClO-induced Mo texturing for improved light management and carrier collection","authors":"Yunjie Bai, Yu He, Yuhao Zhang, Chu Liu, Jingqi Qiao, Hongmei Luan, Yanchun Yang, Bin Yao, Yanping Song, Ruijian Liu, Chengjun Zhu","doi":"10.1063/5.0252478","DOIUrl":"https://doi.org/10.1063/5.0252478","url":null,"abstract":"This study systematically investigates the optimization mechanism of NaClO solution treatment on Mo substrates for enhancing the optoelectronic performance of CZTSSe thin film solar cells. Experimental results demonstrate that a 10 s NaClO soaking forms a “spike-like” texture on the Mo surface, increasing the average surface roughness difference from 34.52 to 77.75 nm. This significantly enhances light scattering, particularly for photons reaching the back Mo electrode, thereby extending the optical path and promoting photon reabsorption. Additionally, the roughened Mo surface improves the wettability of the precursor solution (contact angle decreases from 19.3° to 12.7°), facilitating the formation of larger CZTSSe grains. Electrical characterization reveals that the NaClO-treated Mo substrate significantly reduces the density of negative charge traps at CZTSSe grain boundaries (contact potential difference increases from −1.1 V to −263 mV), suppressing hole recombination and optimizing carrier collection efficiency. The spike-like structure of the Mo surface also shortens the transport path of hole carriers generated by short-wavelength light, further enhancing collection efficiency. Ultimately, the PCE of CZTSSe devices based on the Mo-10 substrate increases from 9.34% to 11.07%, attributed to the reduction in Rs and J0. This study highlights the critical role of a back electrode interface microstructure design in synergistically optimizing light absorption and carrier transport.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"35 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143507014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0