Breaking max efficiency of solar cells by activating 2 electrons with 1 photon
<a href="https://cen.acs.org/energy/solar-power/Supercharging-silicon-solar-cell/97/web/2019/07" rel="nofollow">https://cen.acs.org/energy/solar-power/Supercharging-silicon...</a> has some good takes from people in the field