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

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Abstract
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.
Funding Information
  • AGAUR Fund (2019 FI_B01102, 2021-SGR-00739)
  • Spanish Ministerio de Ciencia e Innovación (PDI2021-128342OB-I00)
  • Catalan Institution for Research and Advanced Studies (ICREA) through the ICREA Academia Award
  • Diptació de Tarragona (2021CM14)

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