Overcoming optical losses in thin metal-based recombination layers for efficient n-i-p perovskite-organic tandem solar cells

Tian, J., Liu, C., Forberich, K. et al. Overcoming optical losses in thin metal-based recombination layers for efficient n-i-p perovskite-organic tandem solar cells. Nat Commun 16, 154 (2025). https://doi.org/10.1038/s41467-024-55376-7

This paper introduces an innovative approach to enhance perovskite-organic tandem solar cell (P-O-TSC) efficiency by optimising the interconnection layer (ICL). Replacing the traditional molybdenum oxide (MoOx) with a solution-processed PEDOT:F layer leads to the formation of smaller, more uniform gold nanoparticles (Au NPs). This significantly reduces parasitic light absorption and improves light transmittance, especially in the near-infrared region. The altered Au NP morphology, due to the low surface energy of PEDOT:F, results in a substantial current gain and a record efficiency of 25.34%. SETFOS was used for drift-diffusion simulations, aiding in understanding charge transport within the device. The PEDOT:F-based ICLs also exhibit enhanced long-term stability.