Abstract:
Thin-film solar cells (TFSCs) have the potential to reach cost effective photovoltaic generated electricity. Cadmium Sulfide (CdS), Indium Sulfide (In2S3) and Zinc Sulfide (ZnS) buffer layer based Copper Indium Gallium Selenide (CIGS) solar cell offers higher efficiency with low manufacturing cost. Therefore, this thesis presents a comparative study among CdS, In2S3 or ZnS buffer layer based CIGS solar cell. The numerical study has been performed using a Solar Cell Capacitance Simulator named SCAPS-1D. The performance of CIGS solar cell is observed by adjusting the buffer layer thickness of each CdS, In2S3 and ZnS. The efficiency of CdS/CIGS solar cell is found 23.74% that is higher than the efficiency of In2S3/CIGS (23.39%) solar cell for 50 nm buffer layer thickness. This efficiency was increased further by using ZnS/CIGS structure that corresponding to an efficiency of 25.51%. It is also found that, the increase in buffer layer thickness from the optimum level degrades the performance of CdS/CIGS and ZnS/CIGS solar cells as compared to In2S3/CIGS solar cell. Therefore, In2S3 or ZnS based CIGS cell could be an ideal candidate as a substitute of toxic CdS buffer layer based CIGS solar cell.
Description:
We would like to express our sincere gratitude to our advisor Associate Professor Dr. Md. Kawsar Alam for entrusting this project to us. We would like to thank him for many insightful conversations and for his patience in teaching us, without which we would never have finished our thesis successfully. He is actively involved in the work of all his students. We would also like to thank our department, EECE dept. MIST, for giving us opportunity to work with such a great mind of our country and giving us support in every aspects. We would like to thank our family and friends who have been instrumental in our thesis.
