High-performance perovskite/silicon tandem solar cells enabled by multifunctional titanium oxynitride recombination layers

IF 70.1 1区材料科学 Q1 ENERGY & FUELS

Nature Energy Pub Date : 2026-07-24 DOI:10.1038/s41560-026-02116-4

Fengxian Cao, Yao Li, Shibo Wang, Kin Long Wong, Cao Yu, Xinya Niu, Bo Gao, Wenhao Li, Jianwei Yu, Yue Zhang, Yiliang Wu, Jun Zhu, Wei Shi, Kun Gao, Liu Yang, Bowen Yang, Wenzhen An, Shifeng Deng, Lei Shi, Shaofei Yang, Xi Chen, Fei Wang, Hanlin Hu, Ruy Sebastian Bonilla, Jian Zhou, Jun Yin, Xiaohong Zhang, Xinbo Yang

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Abstract

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.

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高性能钙钛矿/硅串联太阳能电池由多功能氧化氮化钛复合层实现

单片钙钛矿/硅串联太阳能电池为超越单结光伏电池的效率限制提供了一条有希望的途径。然而，它们的性能、稳定性和可扩展性受到复合层的限制，复合层需要同时实现高效的电荷复合、高光学透明度和强大的界面化学。现有的含铟透明导电氧化物引起了对成本和可持续性的担忧，而硅基隧道结则存在寄生光损耗。在这里，我们表明氧化氮化钛（TiOxNy）可以作为一个多功能的，无铟的复合层，以协调这些竞争的要求。导电TiOxNy可以实现高效的垂直载流子重组，抑制横向泄漏，并通过三叉结合结构为自组装单层（sam）提供锚定位点。因此，我们在1.0 cm2器件上实现了33.3%的功率转换效率（pce），在工业尺寸（207.87 cm2）串联上实现了30.6%的功率转换效率（pce），并增强了运行稳定性。我们的研究结果确立了TiOxNy作为串联光伏可扩展和可持续的互连策略。

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来源期刊

Nature Energy Energy-Energy Engineering and Power Technology

CiteScore

75.10

自引率

1.10%

发文量

193

期刊介绍： Nature Energy is a monthly, online-only journal committed to showcasing the most impactful research on energy, covering everything from its generation and distribution to the societal implications of energy technologies and policies. With a focus on exploring all facets of the ongoing energy discourse, Nature Energy delves into topics such as energy generation, storage, distribution, management, and the societal impacts of energy technologies and policies. Emphasizing studies that push the boundaries of knowledge and contribute to the development of next-generation solutions, the journal serves as a platform for the exchange of ideas among stakeholders at the forefront of the energy sector. Maintaining the hallmark standards of the Nature brand, Nature Energy boasts a dedicated team of professional editors, a rigorous peer-review process, meticulous copy-editing and production, rapid publication times, and editorial independence. In addition to original research articles, Nature Energy also publishes a range of content types, including Comments, Perspectives, Reviews, News & Views, Features, and Correspondence, covering a diverse array of disciplines relevant to the field of energy.