Development and Analysis of Polyvinyl Alcohol‐Based Polymer Electrolytes for Improved Ionic Conductivity and Photostability in Perovskite Solar Cells

The solid polymer electrolytes (SPEs) based on a mixture of iodine (I 2 ), potassium iodide (KI), polyvinyl alcohol (PVA), and polymer F‐127 were investigated. The compositions 0.54 PVA, 0.060 F‐127, 0.40 KI, and 0.04 I 2 had the maximum room temperature conductivity (8.2891 × 10 −4 mS cm −1 ) (for 0.5 g total weight). The electrolyte's ideal mobile ion density is responsible for this increased conductivity. The Vogel–Tamman–Fulcher (VTF) relationship governs the change in conductivity with temperature. These PVA‐based SPEs were employed as electrolytes in perovskite‐sensitized solar cells, including 10–60 weight percent KI and I 2 . The short‐circuit current density ( J sc ) improved with increasing KI content, boosting power conversion efficiency ( η ), which peaked at 40 weight percent KI at 4.74%. Characterization of I–V parameters, scanning electron micrographs (SEMs), and X‐ray diffraction (XRD) analysis, along with the measurement of the photostability of the prepared solar cells constitutes part of the investigation. These findings determine the performance of PVA‐based SPEs in the field of energy conversion and perovskite solar cells.