LAUSR

Abstract In this study, polyethylene oxide (PEO) is introduced into methylammonium lead iodide (MAPbI3) perovskite to replace the standard anti-solvent washing process of perovskite solar cells. By forming PEO-MAPbI3 composites, we achieved controllability of the perovskite surface morphology. Furthermore, the PEO addition improved the electronic properties of the composites by suppressing the trap density of the MAPbI3 perovskite. We observed a significant increase in the average power conversion efficiency (PCE) of the perovskite solar cells (PVSCs) from 0.24% to 7.25% using the proper PEO-perovskite composition ratio (1.5:1), based on their fabrication without any organic anti-solvent treatment. Moreover, the performance uniformity and outdoor stability were significantly enhanced by employing the composite. The proposed PEO-perovskite composite offers a promising pathway for the industrialization of PVSCs in terms of PCE, uniformity, stability, and feasibility—without involving current anti-solvent washing process.