Ankita Srivastava- Doctor of Philosophy
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, India
Ankita Srivastava
- Doctor of Philosophy
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, India
About
34
Publications
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240
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Introduction
Ankita Srivastava currently works at the Physics, Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, India. Ankita does research in Computational Physics, Materials Science and Condensed Matter Physics. Their current project is 'Synthesis and Investigation of some Se based Chalcogenide glasses'.
Current institution
Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, India
Publications
Publications (34)
The impedance spectroscopic (IS) and electrical equivalent circuit analysis of the popular combination indium tin oxide/n‐CdS/p‐Si heterojunction solar cell is being carried out for the very first time in this analytical study using solar cell capacitance simulator (SCAPS)‐1d and the IS module. In this analysis, it is aimed to uncover the device's...
In this analytical study, four‐layer MoS2‐based renewable energy photovoltaic cell has been first introduced using SCAPS‐1d. Proposed cell has FTO as window layer, ZnSe as electron transport layer (ETL), MoS2 as absorber layer, and an exclusive Zn3P2 hole transport layer (HTL) with least lattice mismatch of about 1.8%. To explore highest performanc...
In the renewable energy sector, the research community as well as the industrialists are mostly inclined towards silicon solar photovoltaic technology because of its eco-friendly character as well as abundance, low cost, and non-toxic nature.
A silicon heterojunction (SHJ) solar cell with the attractive and widely used atomic layer deposited (ALD)‐ZnO/n‐CdS/p‐Si configuration is examined in this work to learn more about its electrical properties. Using EIS and SCAPS‐1D, a comprehensive model of the device is created and then simulated. Theoretical aspects of the cell are examined throug...
The perovskite and organic solar cells are becoming the most cognizant of the photovoltaic communities. The Spiro-OMeTAD organic hole transport layer (HTL) shows a significant impact on the CH3NH3SnI3 perovskite solar cell (PSC) with TiO2 as the electron transport layer (ETL). So, we optimized the physical and electrical parameters of the organic H...
Differential Scanning Calorimetry (DSC) is one of the best ways to examine the thermal kinetics of non-equilibrium nature of synthesized non-crystalline materials. The exact thermal kinetics of glassy materials during the glass transition, involves crystallization and polymorphic transition. DSC, a characteristic technique of thermal phase transiti...
Full-potential (linearized) augmented plane-wave ((L)APW) + local orbitals (lo) method-based calculations have been done for SrNbO3 (SNO) or Strontium Niobate, which belongs to the transition-metal perovskites oxides family. It exhibits good electrical conductivity and as well optical transparency. The material is used in useful electronic devices,...
The thermodynamical characteristics of SrNbO3 (SNO) are calculated utilizing the Quasi-Harmonic model (QHM). The model utilizes total energy estimates based on the Generalized Gradient Approximation (GGA) within the Perdew-Burke-Ernzerhof (PBE) level scheme framework. The current research is conducted by utilizing the Gibbs2 codes in conjunction wi...
Herein, the role of bulk/interface defects and their impact on the performance of novel solar cell device structure p‐Si/n‐CdS/ALD‐ZnO (atomic layer deposited zinc oxide) heterojunction solar cells are shown. To calculate all important parameters and connect both types of defects with the performance of the solar cell, a theoretical model to simula...
Lead-based organic-inorganic perovskite (OIP) materials have shown great possibilities as absorber materials in photovoltaic devices. Despite its better power conversion efficiency (PCE), the toxicity of lead limits its application in photovoltaic organic solar cells. This limitation has encouraged researchers to find an alternative lead-free organ...
The propagation of H-polarized electromagnetic (EM) waves in polymeric (PEI)-chalcogenide (As 2 Se 3 ) photonic materials (PCCPM) has been theoretically optimized and investigated in the current work. We used the Transfer Matrix Technique (TMT) and Hankel Realism (HR) in columnar coordinates to show numerical findings for the unit columnar junction...
In this book, scientists present the latest trends and research in the broad field of photonics and photonic materials applications. The 14 chapters are categorized into tracks that give a snapshot of the field including basic sciences (photonics, plasmonics, advanced optics, nanophotonics) and applications (renewable energy, fiber-optics, lasers a...
Recently, the STSA samples of Se78-xTe20Sn2Agx (x = 0, 2, 4, 6) system were synthesized by the classical melt-quench route to get them in bulk form in our laboratory for electrical/thermal characterization. Now, we have prepared their thin films (TFs) using physical vapor deposition for their optical characterization. The optical properties of as-p...
The development of human society and economy, the rapid growth of the global population have significantly aggravated the energy crisis due to excess energy consumption. Even, this ecological destruction has become a serious threat to a sustainable society. Thus, the exploration of renewable energy along with ecological conservation is becoming the...
The aim of the present work is devoted towards the inspection of the incorporation of silver impurity on electric/dielectric properties in a novel third-generation glassy system at low temperatures. For electrical characterization, the temperature and frequency have been chosen in the range 170 K to 285 K and 800 Hz to 500 kHz, respectively. The in...
The performance study of various sensing parameters such as sensitivity, detection accuracy and quality parameter of liquid core Bragg fibre waveguide biosensor based on defect mode has been theoretically studied and compared with experimental findings of a similar structure without defect mode. The electromagnetic wave propagation in the present s...
In the present communication, the temperature-dependent molar volume fraction of various kinds of renewable biodiesel fuel resources in a pseudo-binary mixture is theoretically optimized through the Bragg fiber waveguide (BFW) sensor with a geometrical defect in periodic cylindrical Bragg reflectors. BFW structure is modelled using a transfer matri...
In present communication, doubly tuned Bragg fiber waveguide low power inline optical filter with voltage tunable single crystal PMMA defect cavity is theoretically modeled and discussed using Henkel formalism in a cylindrical coordinate system for multiwavelength LASER applications. The structure provides photonic band gap (PBG) with a resonant tr...
The phenomenon of resistive switching has drawn great attention in last one decade due to its promising applications in the memory technology. The analysis of resistive switching experiments on novel bulk Se–Te–Sn–Ag quaternary glass has been reported in this script. In the present work, we have observed that the pre-exponential factor (Vth)0 of th...
In this work, we have treated the glass transition or pre-crystallization phenomenon as glass/amorphous phase transition. Particularly, we have reported the thermal analysis of so-called glass/amorphous phase transition in recently prepared silver containing semiconducting glasses of third generation (i.e., quaternary system) in terms of glass tran...
Intense investigations are in progress globally towards the immobilization of radioactive and non-radioactive nuclear waste by their direct vitrification or by using novel glassy materials as an alternate shield. In fact, the entire technologies and economies of nuclear waste immobilization have been envisaged in the future on the basis of these ap...
In the current article, the influence of three different doses of gamma-rays on the thermally assisted crystal growth in a novel ternary chalcogenide glassy Se78Te20Sn2 semiconductor has been reported in terms of the re-crystallization. The iso-conversional kinetic approach is used in the present study. The variation of crystal growth rate with tem...
In the present work, we have synthesized novel Se78−xAgxTe20Sn2 (0 ≤ x ≤ 6) semiconducting glasses for improving thermally activated a.c. conduction in STS glass (x = 0). The results of the experimental analysis of thermally activated a.c. conduction have been reported in terms of frequency and temperature of Se78−xAgxTe20Sn2 (0 ≤ x ≤ 6) glasses. T...
The Transient Plane Source (TPS) technique is one of the most efficient methods for studying thermal transport
phenomenon. Current paper is based on the application of TPS technique for measuring the thermal transport
properties (effective thermal conductivity �e, effective thermal diffusivity �e, specific heat per unit volume �Cv�
and related para...
The crystallization kinetics of for ternary Se80−xTe20Inx (x = 0, 10, 15, 20) glasses is studied under non-isothermal
condition using differential scanning calorimetry (DSC). Non-isothermal measurements were performed at different heating rates (5 to 25 K/min). The variation of the activation energy was confirmed by the application
of the iso-conve...
Iso-conversional kinetic analysis is popular in scientific community for analyzing solid-state reactions (e.g., glass/amorphous and amorphous/crystal phase transformations, re-crystallization etc). It is a recognized significant tool to achieve useful outcomes for the solid state reaction under consideration. Present work is devoted to explore some...
Silver-containing chalcogenide glasses are well-known candidates for technical applications as well as for the fundamental studies. In the present report, we have studied the kinetics of glass/crystal phase transformation in novel synthesized glasses of STSA system. For this, purpose, differential scanning calorimetric technique has been employed a...
In present work, we have synthesized multi-component glasses of Se78–xTe20Sn2Agx (x = 0, 2, 4, 6) systems. We have determined some significant physical parameters such as number of constraints per atom (N con), heat of atomization (HS ), mean bond energy 〈E〉, cohesive energy (CE) and lone-pair electrons of chalcogenide Se78–xTe20Sn2Agx (x = 0, 2, 4...
The present work is based on the studies of some thermo-mechanical and dielectric properties in novel glassy Se78-xTe20Sn2Agx (x = 0, 2, 4, 6) system. For this, we have measured micro-hardness using micro-indentation method. The thermo-mechanical parameters such as micro-volume (Vh), formation energy (Eh) of micro-voids in the glassy network and mo...
The aspiration of the present work is to see the effect of Ag incorporation on the thermally activated high field conduction in glassy Ge 20 Se 80 alloy in terms of temperature and voltage dependence of d.c. conductivity. We have observed that the pre-factor o of d.c. conductivity varies with activation energy E according to Meyer-Neldel rule (MNR)...
Questions
Question (1)
Generally, we know that Chalcogenides belongs to SRO amorphous materials , no sharp peaks have been observed in XRD pattern. But during last decades research article, reported that its Medium range order. If in case of SeTeSn chalcogenie alloy show some peaks between (10-90 degree) from XRD and from DSC scan shows sharp glass transition and crystallization temperature. So, how can we explain this behavior and what is the reason behind this? Because still all properties shows amorphous nature.
