Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells

Constructing heterojunctions by surface sulfidation for efficient inverted perovskite solar cells A stable perovskite heterojunction was constructed for inverted solar cells through surface sulfidation of lead (Pb)-rich perovskite films. The formed lead-sulfur (Pb-S) bonds upshifted the Fermi level at the perovskite interface and induced an extra back-surface field for electron extraction. The resulting inverted devices exhibited a power conversion efficiency (PCE) >24% with a high open-circuit...