Perovskite-silicon tandems show geography-dependent economics, not efficiency alone

⚡ AI Executive Summary

Researchers from Chinese institutions fabricated two-terminal perovskite-silicon tandem solar cells and tested their performance under varying spectral conditions using tunable simulators and real-world outdoor data from multiple climate zones. The study reveals that while these tandems achieve high laboratory efficiencies, their commercial viability depends significantly on geographic location and local spectral patterns rather than efficiency improvements alone. The findings reshape expectations for tandem solar deployment, suggesting that site-specific spectral assessment must guide technology rollout decisions. For utilities and grid planners evaluating distributed solar resources, this work implies that tandem economics will vary materially by region, potentially affecting investment returns and levelized costs. The research underscores that deploying high-efficiency PV technologies requires climate-aware engineering to avoid performance surprises in real-world installations.