There are definitely researchers out there working to improve efficiency at the margins -- which could have a big impact on total electricity generation, given the scale of the solar buildout in the works globally.

I think the most interesting innovation right now is happening with batteries technologies -- improvements in lithium-ion but also development of novel forms of long-duration energy storage, such as iron-air, vanadium flow or underground compressed air storage, which I wrote about last month: https://www.latimes.com/environment/newsletter/2023-01-12/this-giant-underground-battery-is-a-1-billion-clean-energy-solution-boiling-point

These stories technologies have huge potential to allow for more solar and wind generation, by balancing out intermittency issues (ie. storing power for when the sun doesn't shine and the wind doesn't blow).

Hope that's helpful. Thank you for the question!