I think I've been reading carbon nanotube hype for at least 15 years now, so are they actually embedded in any current technology changing our lives or is this like self-driving vehicles (that don't kill people) and fusion power where it's always "on the horizon" but never quite manifesting?

[...] The research team found that the treatment created a thin, nickel-based stabilizing bridge layer (NiSO₄–NiOx interfacial layer) [onto the carbon nanotubes] that improves the connection between components inside the solar cell.

Looks nice, especially with their 20% to 24% efficiency.