Balancing carrier transport in interconnection layer for efficient perovskite/organic tandem solar cells

An, Y., Zhang, N., Liu, Q. et al. Balancing carrier transport in interconnection layer for efficient perovskite/organic tandem solar cells. Nat Commun 16, 2759 (2025). https://doi.org/10.1038/s41467-025-58047-3

The goal of this study was to improve carrier balance and reduce non-radiative recombination losses in perovskite/organic tandem solar cells (TSCs) by optimizing the interconnection layer (ICL) using a self-assembled monolayer (SAM)-anchored MoO₃ structure.

Key findings revealed that anchoring SAM layers on both sides of the MoO₃ (creating a SAM/MoO₃/SAM sandwich) significantly improved hole extraction, suppressed non-radiative recombination, and enhanced energy level alignment. This led to a record power conversion efficiency (PCE) of 26.05% (certified at 24.53%) with excellent operational stability (T80 > 650 hours). The modified ICL achieved lower dark current densities and longer carrier lifetimes, confirming improved junction quality and balanced carrier transport.

Fluxim’s Paios system was used for transient photocurrent (TPC) and transient photovoltage (TPV) measurements. These precise time-resolved studies helped quantify charge extraction dynamics and recombination processes, validating the performance improvements attributed to the SAM/MoO₃/SAM configuration. Paios’ ability to deliver reliable, reproducible data across multiple timescales was critical for correlating material modifications to device behavior.

This study is important for the scientific community because it offers a scalable, effective strategy to enhance the efficiency and stability of perovskite/organic TSCs, moving closer to commercially viable tandem photovoltaics.