A dual-functional surface passivator enables ETL-free perovskite solar cells to exhibit 23.71% efficiency.
ETL-free perovskite solar cells (PSCs) draw attention due to their simple structure and low cost, yet suffer from severe interfacial-defect-induced performance and stability degradation. Herein, 2-aminobenzimidazole (2-ABD) is employed as a bifunctional perovskite-surface passivator. It passivates lead defects via Pb-N...