Triple-junction tandem solar cells: structural and spectral optimization for improved current matching and efficiency

Abstract

In this work, a triple-junction tandem solar cell (TSC) has been designed in order to increase the photovoltaic (PV) perfor mance through utilizing maximum light photons. To create three junctions in this work three subcells have been designed and optimized at its best PV performance. The optimization of all the three subcells have been done through the various variations in the absorber layer like thickness and bulk defect density (BDD). It has been seen that best PV parameters in the top middle and bottom cell are maximum at high thickness and low BDD. For the designing of triple junction tandem configuration, two filtered spectrums (FS1 and FS2) have been calculated for the proper current matching in the three sub cells. The optimized triple-junction TSC demonstrates significantly enhanced PV parameters, including high open-circuit voltage (VOC- 2.750), short-circuit current density (JSC- 16.45 mA/cm2), fill factor (FF- 83.40%), and power conversion efficiency (PCE- 37.74%). The strategy of using filtered spectrums and exact design optimization provides a potential road to the next generation of high-efficiency tandem solar cells, furthering the field of renewable energy solutions.