Indian Journal of Physics最新文献_第9页

In-depth dielectric study of bulk nanocrystalline β-H2Pc with different biasing and photovoltaic performance of β-H2Pc/p-Si solar cell under varied illumination 不同偏压下块状纳米晶 β-H2Pc 的深度介电研究以及不同光照下 β-H2Pc/p-Si 太阳能电池的光伏性能

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-18 DOI: 10.1007/s12648-024-03267-4

A. A. El-Saady, A. A. M. Farag, N. Roushdy, Dalia M. Abdel Basset, M. M. El-Nahass

{"title":"In-depth dielectric study of bulk nanocrystalline β-H2Pc with different biasing and photovoltaic performance of β-H2Pc/p-Si solar cell under varied illumination","authors":"A. A. El-Saady, A. A. M. Farag, N. Roushdy, Dalia M. Abdel Basset, M. M. El-Nahass","doi":"10.1007/s12648-024-03267-4","DOIUrl":"10.1007/s12648-024-03267-4","url":null,"abstract":"<div>This study offers a comprehensive analysis of the thermal stability of β-metal-free phthalocyanine (β-H2Pc) powder, demonstrating its resilience at temperatures of approximately 470°C. The nanocrystalline nature of β-H2Pc was confirmed using scanning electron microscopy, particle size analysis, and atomic force microscopy. Furthermore, an extensive exploration of the dielectric properties of bulk β-H2Pc, in the form of compacted pellets, was undertaken over a wide frequency range (10 Hz–20 MHz) at different temperatures (303, 348, and 423 K), with consideration of the impact of DC-bias voltages (− 2 V to 2 V). Interestingly, the examined dielectric characteristics exhibited a substantial dependency on bias voltage, frequency, and temperature. The series resistance diminishes with increasing temperature, indicating enhanced device performance under elevated thermal conditions. In addition, this study delved into the photovoltaic characteristics of the β-H2Pc/p-Si diode under various illumination levels and was used to evaluate its potential for optoelectronic applications. The observed current density–voltage behavior demonstrates diode-like properties, with the generated current showing evidence of thermal activation. Furthermore, the Fill Factor decreased with increasing illumination intensity and power.<h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 1","pages":"129 - 143"},"PeriodicalIF":1.6,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738878","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}

引用次数: 0

Exploring electronic, structural, optical, and elastic properties of MgX2O6 (x = Ta, Nb) compounds for photovoltaic and optoelectronic applications: first study effort 探索用于光伏和光电应用的 MgX2O6（x = Ta、Nb）化合物的电子、结构、光学和弹性特性：首次研究工作

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-18 DOI: 10.1007/s12648-024-03147-x

Murat Aycibin, Mustafa Çelebi, Mehmet Erzen, Harun Akkuş

引用次数: 0

Synthesis and characterization of structural, electrical, magnetic and microwave properties of Ba0.5Sr0.5Fe12O19-polyaniline nanocomposites Ba0.5Sr0.5Fe12O19 聚苯胺纳米复合材料的结构、电学、磁学和微波特性的合成与表征

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-18 DOI: 10.1007/s12648-024-03336-8

Tavus Hosseinabad, Gholamreza Nabiyouni, Kambiz Hedayati

{"title":"Synthesis and characterization of structural, electrical, magnetic and microwave properties of Ba0.5Sr0.5Fe12O19-polyaniline nanocomposites","authors":"Tavus Hosseinabad, Gholamreza Nabiyouni, Kambiz Hedayati","doi":"10.1007/s12648-024-03336-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03336-8","url":null,"abstract":"In this article, barium strontium hexaferrite was synthesized using the surfactant-free ultrasonic method. Then Ba0.5Sr0.5Fe12O19/polyaniline nanocomposites were made in the form of thick layer, thin film and nanofibers. The bulk layer forges via the in-situ synthesis method, and the thin film is synthesized by electrodeposition in cyclovoltammetry mode. The nanofibers were manufactured using the electrospinning method. The products were investigated via X-ray diffractometer, field emission scanning electron microscope, transmission electron microscope, and vibration sample magnetometer. The band gap, exciton binding energy, and the Urbach energy of Ba0.5Sr0.5Fe12O19 nanoparticles were calculated by optical and electrical methods. The reflection loss of nanocomposites at frequencies between 2 and 18 GHz was measured by Vector Network Analyzer. The magnetic properties of nanoparticles were weakened by their presence in the polymer matrix. The DC conductivity of polyaniline decreased by adding ferrite nanoparticles to it and reached from 0.67 S.cm−1 in pure polyaniline to 2.5 × 10–5 S.cm−1 in composite nanofibers. The highest value of reflection loss (RLmin) − 16.99 dB at the frequency (fmin) of 11.2 GHz was obtained for the thick layer nanocomposite.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"30 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738879","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}

引用次数: 0

The radial scalar power potential and its application to quarkonium systems 径向标量幂势及其在夸克鎓系统中的应用

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-17 DOI: 10.1007/s12648-024-03335-9

Etido P. Inyang, N. Ali, R. Endut, N. Rusli, S. A. Aljunid

引用次数: 0

Micro-Raman spectroscopy of graphene defects and tracing the oxidation process caused by UV exposure 石墨烯缺陷的微拉曼光谱分析以及紫外线照射引起的氧化过程追踪

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-15 DOI: 10.1007/s12648-024-03338-6

Somayeh Gholipour, Maryam Bahreini, Mohamad Reza Jafarfard

{"title":"Micro-Raman spectroscopy of graphene defects and tracing the oxidation process caused by UV exposure","authors":"Somayeh Gholipour, Maryam Bahreini, Mohamad Reza Jafarfard","doi":"10.1007/s12648-024-03338-6","DOIUrl":"https://doi.org/10.1007/s12648-024-03338-6","url":null,"abstract":"Raman spectroscopy is a widely used method for the analysis of various samples, including carbon-based materials. This study aimed to identify the number of layers and defects in graphene using micro-Raman spectroscopy. More specifically, this study examined the oxidation process of graphene under UV exposure. An investigation of the effect of the power density of the Raman excitation laser revealed a linear dependence between the ratio of I2D/IG and the power density of the excitation laser. Additionally, the absence of peak D due to the increase in power density provides evidence for the nondestructive nature of micro-Raman spectroscopy. Given the value of I2D/IG, one of the parameters for determining the number of layers in graphene, which reaches 1.39 at the edge, the findings indicate the possibility of an edge fold of single-layer graphene. During the oxidation process, the intensity and position of the D peak increase as a function of exposure time. Alterations in the graphene Raman spectrum, comprising the disappearance of the 2D peak and the appearance of the D peak, trace and confirm the oxidation process of the sample.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"6 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141722355","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}

引用次数: 0

Equilibrium description of thermodynamics in f(R, T) gravity f(R, T) 引力下的热力学平衡描述

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-15 DOI: 10.1007/s12648-024-03132-4

Sudabeh Akbarpour, Akram S. Sefiedgar

{"title":"Equilibrium description of thermodynamics in f(R, T) gravity","authors":"Sudabeh Akbarpour, Akram S. Sefiedgar","doi":"10.1007/s12648-024-03132-4","DOIUrl":"10.1007/s12648-024-03132-4","url":null,"abstract":"<div>The f(R, T) gravity as a modified theory of gravity is considered to study the Friedmann–Robertson–Walker (FRW) universe. We consider the case (f(R,T)=f_1(R)+2f_2(T)), where (f_1(R)) is an arbitrary function of Ricci scalar and (f_2(T)) is an arbitrary function of the trace of the energy-momentum tensor. Using the usual field equations, the conservation equation does not hold. However, we can redefine the field equations to satisfy the conservation equation. In this paper, we show that the FRW universe, as a closed system, may have a conserved 4-momentum if we assume an interaction between matter and the dark energy component coming from (f_2(T)). The rate of the energy transfer between the ordinary matter and the dark energy component induced by (f_2(T)) is obtained. Then, we derive the first law of thermodynamics by using the field equations and the standard entropy-area law on the apparent horizon. It is shown that there is an equality between the Friedmann equation and the first law of thermodynamics. One can also find an equilibrium description of thermodynamics in f(R, T) gravity. In addition, we investigate the validity of the generalized second law of thermodynamics. It is shown that the generalized second law of thermodynamics is always satisfied in the FRW universe.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"98 12","pages":"4217 - 4223"},"PeriodicalIF":1.6,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141647010","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}

引用次数: 0

The study of perturbation in magnetized Schwarzschild anti-de Sitter spacetime and dark energy profile 磁化施瓦兹柴尔德反德西特时空的扰动和暗能量剖面研究

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-13 DOI: 10.1007/s12648-024-03286-1

Muhammad Saad Ghafar, Farhad Ali, Saqib Hussain, Nahid Fatima, Maryam Alghafli

{"title":"The study of perturbation in magnetized Schwarzschild anti-de Sitter spacetime and dark energy profile","authors":"Muhammad Saad Ghafar, Farhad Ali, Saqib Hussain, Nahid Fatima, Maryam Alghafli","doi":"10.1007/s12648-024-03286-1","DOIUrl":"10.1007/s12648-024-03286-1","url":null,"abstract":"<div>We are going to investigate the geodesic motion of charged particles in the vicinity of Schwarzschild anti-de-Sitter (S-AdS) spacetime with topological defects that admit temporal perturbation. We used the approximate Noether symmetry equation to insert the time conformal factor in the black hole without losing its symmetry structure. This type of insertion is necessary because the black hole radiates its energy and momentum in the form of gravitational waves and Hawking radiation. Along with the temporal perturbation, the S-AdS black hole (BH) is immersed in an external magnetic field. We conduct an in-depth examination of the dynamics of charged particles near a weakly magnetized and time conformal S-AdS BH. Our analysis involves calculating the shift in the position of the innermost circular orbit (ISCO) caused by both temporal perturbation and the presence of a magnetic field. Furthermore, we explore the influence of dark energy (DE) and angular momentum on the stability of these orbits. Additionally, we determine the effective force and escape velocity for a charged particle orbiting around the perturbed magnetized S-AdS BH. The application of time-dependent perturbation theory can extend our understanding to investigate the quasinormal modes (QNMs) of BH mergers.\u0000</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 2","pages":"337 - 346"},"PeriodicalIF":1.6,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12648-024-03286-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Relativistic minisuperspaces in Finslerian background 芬斯勒背景下的相对论超小空间

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-13 DOI: 10.1007/s12648-024-03318-w

S. S. De, Farook Rahaman, Antara Mapdar

引用次数: 0

A Study on the influence of different HTL and ETL layers on the performance of a P3HTI(C_{60})BA bulk heterojunction organic solar cell 不同 HTL 层和 ETL 层对 P3HTI $$C_{60}$ BA 体异质结有机太阳能电池性能影响的研究

IF 1.6 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-13 DOI: 10.1007/s12648-024-03278-1

C. D. Ramabadran, K. S. Sudheer

{"title":"A Study on the influence of different HTL and ETL layers on the performance of a P3HTI(C_{60})BA bulk heterojunction organic solar cell","authors":"C. D. Ramabadran, K. S. Sudheer","doi":"10.1007/s12648-024-03278-1","DOIUrl":"10.1007/s12648-024-03278-1","url":null,"abstract":"<div>In photovoltaic research, bulk heterojunction organic solar cells have garnered significant interest as light harvesters. This increased attention underscores the importance of advance research in organic solar cell development. The present study considers an organic bulk heterojunction solar cell with P3HT:IC(_{60})BA as the active layer. Simulation studies are conducted using SCAPS 1D software. Initially, the software is standardized by comparing the experimental data of the solar cell structure, ITO/PEDOT:PSS/P3HT:IC(_{60})BA/ZnONPS/Al with the simulated characteristics of the solar cell. Subsequently simulation research is done to evaluate the impact of different hole transport layers (HTL) and electron transport layers (ETL) on device performance.The HTL materials considered in this study include PEDOT:PSS, CuI, and Cu(_{2}O) while the ETL materials include ZnO NPs, Sn(O_{2}), Ti(O_{2}), IGZO and PCBM. According to the results, the cell structure employing Cu(_{2}O) as the HTL and IGZO as the ETL performed better than all other combinations. The cell structure is further optimized to analyze the impact of material parameters on device performance.</div>","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"99 1","pages":"273 - 282"},"PeriodicalIF":1.6,"publicationDate":"2024-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141614430","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}

引用次数: 0

Analysis of ground and space geoelectric field during geomagnetic storms over Fresno, CA USA: wavelet coherence approach 美国加利福尼亚州弗雷斯诺上空地磁风暴期间的地面和空间地球电场分析：小波相干方法

IF 2 4区物理与天体物理

Indian Journal of Physics Pub Date : 2024-07-12 DOI: 10.1007/s12648-024-03328-8

A. Giri, B. Adhikari, C. Idosa, D. Pandit

{"title":"Analysis of ground and space geoelectric field during geomagnetic storms over Fresno, CA USA: wavelet coherence approach","authors":"A. Giri, B. Adhikari, C. Idosa, D. Pandit","doi":"10.1007/s12648-024-03328-8","DOIUrl":"https://doi.org/10.1007/s12648-024-03328-8","url":null,"abstract":"The solar wind interacts with the earth magnetosphere and ionosphere, causing disturbances that create geoelectric fields in the Earth’s surface. These geoelectric fields link magnetospheric and ionospheric events, affecting the near-Earth environment. In the present study, we analyzed the ground- and space-based geoelectric field over Fresno, California, USA during three geomagnetic storms of different intensities, 19th February 2014 (moderate event), 17th March 2015 (intense event), and 17th March 2016 (weak event). We employed time series analysis and wavelet coherence analysis (WTC) to analyze fluctuations and investigate the strength of association and phase relationship between time series data of geomagnetic storms and geoelectric fields. We observed that ground-based magnetic and electric field fluctuations exhibited a distinct trend compared to space-based observations. WTC indicates that Ey (Space based Electric field) exhibits comparatively more enhanced power regions with solar parameters than EYt (Ground based elecrtic field). This is attributed to the impact of solar winds, which affect the ground electric field but have a less significant effect on the electric field in space.","PeriodicalId":584,"journal":{"name":"Indian Journal of Physics","volume":"38 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141609476","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}

引用次数: 0