چكيده به لاتين
Abstract
Perovskite solar cells with power conversion efficiency higher than 25.5% and a fast and cheap manufacturing process are one of the most promising technologies in this field to replace silicon solar cells. However, the presence of some limiting factors, such as different types of charge carrier recombination mechanisms, has led to the lack of reproducibility in the fabrication of perovskite solar cells with high efficiency. One of the best ways to better understand the recombination mechanisms and their effect on the performance of solar cells is to investigate the changes in the performance parameters of solar cells under different light intensities.
For this purpose, in this work, a light intensity changer setup was designed and built so that the behaviour of solar cells can be investigated by examining the effects of changing the intensity of light irradiated to a sample. In addition, to investigate the effect of perovskite ink concentration, four samples of perovskite ink with concentrations of 1.45, 1.3, 1.15 and 1 M were used to fabricate solar cells so that we can reach an optimal value for ink concentration. PL and UV-Vis optical analysis, current density-voltage (J-V) characterization, external quantum efficiency, and the effect of changing light intensity on the functional parameters of solar cells have used to characterize the implanted layers and the resulting solar cells. In this research, perovskite solar cells made with a concentration of 1.3 M with a maximum efficiency of 13.43% compared to solar cells with a maximum efficiency of 12.04%, 10.41% and 8.02% for concentrations of 1.45, 1.15 and 1 M were obtained, which indicates the better quality of active layers for layers with 1.3 M concentration. Also, the results of investigating the effects of light intensity on functional parameters showed that active layers with a concentration of 1.3 M show a lower amount of recombination compared to other layers.
Keywords: Perovskite Solar Cell, Radiant Light-Intensity, Bimolecular Recombination, Trap-assisted Recombination
