left out the actual science part of this interesting part: > According to Yablonovitch, this finding builds on work that he and students published in 2011, whi

left out the actual science part of this interesting part: > According to Yablonovitch, this finding builds on work that he and students published in 2011, which found that the key to boosting solar cell efficiency was not by absorbing more photons (light) but emitting them. By adding a highly reflective mirror on the back of a photovoltaic cell, they broke efficiency records at the time and have continued to do so with subsequent research.