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

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.