Buried Interface Regulation with TbCl3 for Highly-Efficient All-Inorganic Perovskite/Silicon Tandem Solar Cells

• TbCl3 doping improves the buried interface between Me-4PACz and CsPbI3, enhancing crystallinity and passivating defects. • Inverted CsPbI3 PSCs achieve a remarkable efficiency of 18.68% with enhanced ambient stability. • Efficiencies of 29.40% (4T) and 25.44% (2T) are achieved in all-inorganic perovskite/silicon tandem devices, among the highest reported. • This work provides a novel metal halide doping strategy for high-performance and stable inverted all-inorganic PSCs and tandem solar cells.