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Bifacial tunnel oxide passivating contacts for silicon and perovskite/silicon tandem solar cells with improved efficiency
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DOI：10.1038/s41560-026-02007-8.png)
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Abstract
En 中文
The power conversion efficiency (PCE) of conventional tunnel oxide passivating contact (TOPCon) solar cells is fundamentally constrained by front-side recombination losses in both contact and non-contact regions. Here we demonstrate full-size bifacial TOPCon solar cells incorporating patterned front n-type TOPCon fingers and a full-area rear p-type TOPCon emitter, achieving a certified PCE of 26.34%. The devices exhibit excellent damp-heat stability and negligible light-induced degradation and light-and-elevated-temperature-induced degradation. These advances arise from the engineering of the front n-type TOPCon and rear bilayer p-type TOPCon contacts, enabled through controlled polycrystalline silicon crystallinity, dopant concentration, tunnel oxide properties and optimized silver paste formulation. Integrating this high-performance bifacial TOPCon bottom cell with a wide-bandgap perovskite top cell yields monolithic perovskite/TOPCon tandems with a certified PCE of 32.73% and an open-circuit voltage of 1.961 V. This work provides a scalable and industry-compatible pathway to higher-efficiency TOPCon and perovskite/TOPCon tandem photovoltaics. Interfacial charge recombination losses limit solar cell efficiency. Gao et al. mitigate these losses through front and rear-contact engineering, achieving efficiencies of 26.34% and 32.73% in tunnel oxide passivating contact single-junction and tandem solar cells.
Keywords:
Materials for energy and catalysis
Solar cells
Energy
general
Energy Policy
Economics and Management
Energy Systems
Energy Storage
Renewable and Green Energy
Journal
IF:
60.1
Papers:
981
Citations:
5.6W
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