Investigating the Role of PM6:Y7 Layer Thickness on Optimizing Non-fullerene Organic Solar Cells Performance through Impedance Spectroscopy Analysis

Identificador:  imarina:9325781

Handle: https://hdl.handle.net/20.500.11797/imarina9325781

Autors:  Moustafa, Enas; Pallares, Josep; Marsal, Lluis F; Marsal, Lluis F

Resum:
Recently, there has been significant improvement in the power conversion efficiency of non-fullerene organic solar cells, exceeding 19%. In this article, we have fabricated conventional sandwich structure of ITO/PEDOT:PSS/PM6:Y7/PDINO/Ag reaching efficiency up to 17.3% along with high generated current density of 30.60 mA/cm2 for the optimized devices. The thickness of PM6:Y7 layer has been varied to investigate the impact on the overall device behavior. The obtained results showed that the PCE has been enhanced by 15% upon reducing its thickness from 150 nm to 100 nm. Accordingly, current-voltage measurements and impedance spectroscopy analysis through capacitance-voltage, Mott-Schottky analysis and capacitance frequency under different illumination intensities were conducted to evaluate the behaviour of the charge recombination due to thickness variation of the PM6:Y7 photoactive layer.