Nature Energy, Published online: 13 July 2026; doi:10.1038/s41560-026-02111-9

Elemental diffusion in Cu2ZnSnS4 induces secondary phases and defects, limiting the open-circuit voltage in associated solar cells. Wang et al. introduce two-stage copper incorporation to suppress copper out-diffusion, enabling 12.4% efficiency and an 874-mV open-circuit voltage in solar cells.

Nature, Published online: 10 June 2026; doi:10.1038/s41586-026-10623-3

Whole-brain, cellular-resolution imaging reveals a hierarchical thalamus–brainstem attractor network that encodes recent history and shapes behavioural bias in zebrafish.