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High-performance perovskite/silicon tandem solar cells enabled by multifunctional titanium oxynitride recombination layers
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DOI：10.1038/s41560-026-02116-4.png)
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Abstract
En 中文
Monolithic perovskite/silicon tandem solar cells offer a promising pathway to surpass the efficiency limits of single-junction photovoltaics. However, their performance, stability and scalability are constrained by the recombination layer, which needs to simultaneously enable efficient charge recombination, high optical transparency and robust interfacial chemistry. Existing indium-containing transparent conductive oxides raise concerns regarding cost and sustainability, whereas silicon-based tunnel junctions suffer from parasitic optical losses. Here we show that titanium oxynitride (TiOxNy) can serve as a multifunctional, indium-free recombination layer that reconciles these competing requirements. Conductive TiOxNy enables efficient vertical carrier recombination, suppresses lateral leakage and provides anchoring sites for self-assembled monolayers (SAMs) via a tridentate binding configuration. As a result, we achieve power conversion efficiencies (PCEs) of 33.3% for 1.0-cm2 devices and 30.6% for industrial-size (207.87 cm2) tandems, with enhanced operational stability. Our results establish TiOxNy as a scalable and sustainable interconnection strategy for tandem photovoltaics. The interconnected recombination layer is key to advance perovskite/silicon tandem solar cells. Cao et al. show that titanium oxynitride reconciles the requirements for recombination layers, improving the efficiency and stability for tandem solar cells and modules.
Journal
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60.1
Papers:
981
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5.6W
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