Enhanced Performance of Perovskite Solar Cells Through the Application of Pure Natural Centella asiatica Extract Additives

Abstract

This study initially employs Cs₀.₀₅FA₀.₈₁MA₀.₁₄PbI₂.₈₆Cl₀.₁₄ as the active layer for perovskite solar cells and explores the impact of using different concentrations of natural Centella asiatica (CICA) extracts mixed with chlorobenzene (CB) as anti-solvent in the one-step method of perovskite film preparation. Centella asiatica is rich in natural antioxidants and asiatic acid. It contains many hydroxyl ions, which are capable of capturing uncoordinated heavy metal Pb atoms. We found that devices made with 15% Centella asiatica extract mixed with CB achieved the highest power conversion efficiency (PCE), increasing from 14.3% to 18.5%. Moreover, the devices maintained 85% of their initial efficiency after being stored in a glove box for 25 days.