Potential of low-cost inorganic CaFeO3 as transporting material for efficient perovskite solar cells

Perovskite solar cells with inorganic and organic transporting layers offer a new venue for their commercialization due to their low cost and high-power conversion efficiency. This manuscript focuses on using inorganic calcium ferrite (CaFeO3) as a hole electron layer (HEL) and offers superior stability and efficiency compared to organic HEL. Time-resolved photoluminescence spectroscopy (TRPL) demonstrated better charge extraction and less recombination at the HEL/perovskite and EEL/perovskite interface. A theoretical investigation has been carried out to compare the experimental findings and to find the mechanism behind the observed high-power conversion efficiency. Theoretical analysis validates the experimental results with a power conversion efficiency of ∼16%. The role of HEL, EEL, and perovskite absorbing layers along with the influence of their thickness on power conversion parameters viz. short-circuit current (Jsc), open-circuit voltage (Voc), fill factor (FF), and power conversion efficacy (PCE), have been investigated. The possible mechanism behind the observed result has been discussed.