Nature Energy, Published online: 05 August 2026; doi:10.1038/s41560-026-02125-3

The performance of perovskite/Cu(In,Ga)Se2 tandem solar cells is limited by optical and electronic losses at the interfaces between layers. By engineering two of these interfaces, Zeng, Wang, Tang et al. achieve a certified efficiency of 30.57% and improved device stability.

Nature Energy, Published online: 04 August 2026; doi:10.1038/s41560-026-02121-7

Including the costs of charging infrastructure in a European energy system model reveals that unidirectional smart charging delivers up to 4.5% in annual system cost savings, whereas bidirectional charging technology generates substantial market revenues in solar-dominated systems. Thus, charging infrastructure targets should account for differences across diverse national energy systems.