ArticleNature communications2026
Non-contact laser polishing and reconstruction towards high-efficiency all-perovskite tandem solar cells.
Article in Nature communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The performance of all-perovskite tandem solar cells is critically hindered by the defective and high-roughness surfaces of lead-tin narrow-bandgap subcells, which induce non-radiative recombination and impede carrier extraction. Herein, we report a robust and multifunctional strategy to convert the above narrow-bandgap perovskite surface into an efficient and smooth one by a picosecond ultraviolet pulsed laser polishing technology combined with surface reconstruction. The polished surface is decoded as [PbI₆]⁴⁻/[SnI₆]⁴⁻ octahedral frameworks with metastable A-site vacancies. By screening guanidinium bromide as an A-site passivator, the polished surface is reconstructed into a guanidinium-cesium-based perovskite phase, substantially enhancing carrier extraction and suppressing ion migration. The resulting single-junction lead-tin and tandem solar cells, fabricated via an antisolvent-free method, achieve efficiencies of 23.47% (certified) and 29.80%, respectively, alongside exceptional operational stability. This versatile interface engineering paradigm surmounts a pivotal barrier in the advancement of next-generation photovoltaic technologies.
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