Pushing the Interconnection Limit in Perovskite-Organic Tandem Solar Cells Through Recombination Channels Delocalization.

Ultrathin metallic interconnections in perovskite-organic tandem solar cells (PO-TSCs) are commonly driven toward highest possible coverage to achieve efficient low-loss carrier recombination, inevitably causing severe plasmonic absorption and optical reflection. Here, we demonstrate that efficient tandem interconnection can be achieved at an Au coverage of only ∼77.4% by regulating conductive recombination pathways. A ZnS interlayer-regulated Au growth strategy transforms isolated Au clusters into laterally extended planarized domains, substantially increasing the fraction of low-loss recombination pathways while concurrently mitigating optical dissipation by suppressing localized surface plasmon resonance. As a result, the optimized PO-TSCs achieve an efficiency of 27.1% with an extrapolated T80 lifetime exceeding 1400 h. This work pushes the limit of metallic interconnections close to the theoretical values and deepens the understanding of conductive recombination pathway regulation in tandem devices.