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Performance Study of Silicon-Based Multi-Junction Solar Cell

Computational Water, Energy, and Environmental Engineering 2019年第4期8卷 91-98页

作者： kamrunnahar kali Mohammad Ashraful Islam Must. Asma Yasmin Sangita Das Komol Kanta Sharker Department of Physics Comilla University Cumilla Bangladesh Department of Physics University of Chittagong Chattogram Bangladesh Department of Computer Science and Engineering Bangladesh Army University of Engineering and Technology Natore Bangladesh Department of General Educational Development Daffodil International University Dhaka Bangladesh

This paper presents a performance study of silicon-based multi-junction (MJ) solar cell which is produced by Spectrolab is the most efficient solar cell in the world, with a record efficiency of over 40%. The I-V characteristics of solar cells were investigated for different environmental conditions (both at indoor and outdoor). Photovoltaic (PV) parameters like short circuit current (ISC), open circuit voltage (VOC), fill factor (FF) and efficiency (?) were evaluated for the fabricated cell. The fabricated cell provides I-V characteristics curve which shows that the maximum efficiency of the cell is obtained when the cell temperature is lower. It was also observed that, efficiencies of the cells are about 17% to 24% at indoor and 7% to 20% at outdoor and fill factors are 0.40 to 0.71. From the result, it can also be found that fill factor is directly affected by the values of the cells series and shunt resistance.

关键词： Multijunction (MJ) Solar Cell Photovoltaic Performance Efficiency Enhancement

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Effect of Ti4+Doping on Structural, Electrical and Magnetic Properties of Ni0.4Cu0.2Zn0.4Fe2-xTixO4Ferrites

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Materials Sciences and Applications 2019年第12期10卷 733-745页

作者： Sajal Chandra Mazumdar Farhad Alam Umma Habiba Tanni kamrunnahar kali Bablu Chandra Das Mohammed Nazrul Islam Khan Department of Physics Comilla UniversityCumillaBangladesh Department of Physical Sciences School of Engineering and Computer ScienceIndependent UniversityDhakaBangladesh Departments of Physics Bangladesh University of Engineering and TechnologyDhakaBangladesh Materials Science Division Atomic Energy CentreDhakaBangladesh

Ti4+ doped Ni0.4Cu0.2Zn0.4Fe2-xTixO4 (x = 0.0, 0.02, 0.05, 0.07, 0.10) chemical compositions are prepared by conventional solid state reaction technique. The ferrite phase formation has been confirmed from the pattern of XRD. The theoretical density (ρth), bulk density (ρB), and porosity are calculated from the XRD data and using approximate formulas. Value of ρth is found to be greater than the value of ρB indicating the formation of pores inside the bulk specimens. The micro-structural investigation has been done using Field Emission Scanning Electron Microscope and it is found that the average grain size reduces with the increase of Ti content. Saturation magnetization (Ms) also reduces with the increase of Ti content, contrarily remanent magnetization (Mr) and coercivity (Hc) increases with the concentration of Ti in the composition due to the pinning effect. The real part of the initial permeability is found to be maximum for the x = 0.02 sample which could be due to the homogeneity and high density of the sample. For increasing frequency, the dielectric constant and dielectric loss are observed to decrease.

关键词： Ferrite X-Ray Diffraction VSM SEM Dielectric Properties Magnetization

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Performance Study of Silicon-Based Multi-Junction Solar Cell

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Computational Water, Energy, and Environmental Engineering（水能与环境工程） 2019年第4期

作者： kamrunnahar kali Mohammad Ashraful Islam Must. Asma Yasmin Sangita Das Komol Kanta Sharker

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