《科学》（20220128出版）一周论文导读
A stable perovskite heterojunction was constructed for inverted solar cells through surface sulfidation of lead –rich perovskite films. The formed lead-sulfur 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 >24% with a high open-circuit voltage of 1.19 volts， corresponding to a low voltage loss of 0.36 volts. The strong Pb-S bonds could stabilize perovskite heterojunctions and strengthen underlying perovskite structures that have a similar crystal lattice. Devices with surface sulfidation retained more than 90% of the initial PCE after aging at 85°C for 2200 hours or operating at the maximum power point under continuous illumination for 1000 hours at 55° ± 5°C.
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