http://dspace.ewubd.edu:8080/handle/123456789/1021 2026-04-04T12:55:35Z http://dspace.ewubd.edu:8080/handle/123456789/2529 Design and Simulation of Efficient Perovskite Solar Cells Sayeed, Md Abu; Salem, Issam The demand of electricity is increasing day by day. Today this demand is mostly meet by burning coal, oil and natural gas. After depletion of this sources renewable energy will become the main source of electricity for the next generation. Among all the renewable energy sources, solar photovoltaic will be the potential source of energy. Solar cell can convert sunlight directly into electricity. Thin film solar cell becomes more popular because of its low material cost. Perovskite solar cell is recently invented in recent years due to its advantageous features including high absorption, low cost, ease of fabrication and rapidly improving efficiencies. Using organometallic halide Perovskite as absorber layer the efficiency have already increased above 20% in recent years. A Perovskite solar cell is made of three main layers where a Perovskite layer is sandwiched between the n type and p type material. The standard design for a Perovskite solar cell is: Back contact/ Hole transporting material (HTM)/ Perovskite as absorber layer/ Electron transport material (ETM)/ transparent electrode. By increasing the conductivity of the hole transport materials by doping and optimizing charge collection by adjusting the absorber thickness and band gap the efficiency can be improved. Electron transporting materials are also an important component in perovskite based solar cells. Several PV parameters such as thickness of the absorber, Hole transporting material (HTM) and Electron transport material (ETM) respectively can be optimized by simulation methods and subsequently implemented by experimentalist. In this work, we designed a Perovskite solar cell using ZnO as n-type and Cu2O as p-type material, CH3NH3PbI3 (Perovskite) as intrinsic layer material. Considering 300K as room temperature we found the maximum efficiency of 25.29%, with Voc= 0.8082 V, Jsc =36.92 mA/cm2 and FF of 84.74% when absorber layer (CH3NH3PbI3) thickness was 15 μm. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Applied Physics and Electronics of East West University, Dhaka, Bangladesh 0008-01-01T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/1521 Spectrum Sensing of Cognitive Radio Network Under Linear Combination of Gaussian Random Variables D’ Costa, John; Nazimuzzaman, Muhammad In this project work we studied the Spectrum Sensing techniques for Cognitive Radio (CR) and derived Probability of Detection (PD) and Probability of False Alarm (PF) of a Cognitive Radio Network (CRN). Here we considered the test statistics as the weighted sum of the Gaussian random variables where the weighting factor depends on the eigenvalues of covariance matrix of Multiple-Input-Multiple-Output (MIMO) channel with Additive White Gaussian Noise (AWGN). We calculated PD and PF by changing channel parameters like number of sample values to find the threshold Signal-to-Noise Ratio (SNR) within condition PD above 80% and PF less than 8%. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Applied Physics and Electronics of East West University, Dhaka, Bangladesh 0009-01-01T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/1307 Design & Developing of a Microcontroller Based Smart Home Appliance Control System Paul, Hiranmoy; Majumder, Ajit Chandra The price of electricity is gradually increasing all over the world. In Bangladesh the price is also increasing day by day. In these circumstances, the users will try to minimize the wastage of electricity. In this project, a smart control system for home appliances has been developed to minimize the electricity wastage. The systems will automatically shutdown the electrical loads when the last person leaves the room. When the first person enters the room the loads will get power and can be run by their switches. If a person enters the room the system will increase its count by one and when a person leaves the room it will decrement its count. When the value of count is zero the power will be cut off. To count the number of persons in the room optical sensors have been used. An Arduino Uno board has been used to count the persons and control the power to the load. A program has been developed using Arduino software. The system has been constructed and tested. It is found that the system works properly. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Applied Physics and Electronics of East West University, Dhaka, Bangladesh 0012-01-01T00:00:00Z http://dspace.ewubd.edu:8080/handle/123456789/1304 Research Project on Spectrum Sensing of Cognitive Radio Network under Linear Combination of Gaussian Random Variables D’ Costa, John In this project work we studied the Spectrum Sensing techniques for Cognitive Radio (CR) and derived Probability of Detection (PD) and Probability of False Alarm (PF) of a Cognitive Radio Network (CRN). Here we considered the test statistics as the weighted sum of the Gaussian random variables where the weighting factor depends on the eigenvalues of covariance matrix of Multiple-Input-Multiple-Output (MIMO) channel with Additive White Gaussian Noise (AWGN). We calculated PD and PF by changing channel parameters like number of sample values to find the threshold Signal-to-Noise Ratio (SNR) within condition PD above 80% and PF less than 8%. This thesis submitted in partial fulfillment of the requirements for the degree of Masters of Science in Applied Physics and Electronics of East West University, Dhaka, Bangladesh. 0012-01-01T00:00:00Z