phys.org:Solar power advances possible with new 'double-glazing' device
cleantechnica.com:Scientists Channel Tesla & Einstein To Invent New Double-Glazed Solar Panel
Two sources so you can compare the reporting. I like both but generally prefer phys.org; they're usually out front. In this case 2 days earlier and include a journal reference in addition to U of Warwick.
Anywho, this is Steampunk Stuff.

Two transparent surfaces, one electrically conductive and one with a sputtered coating of [diamond] with the cavity filled with argon.
This is low-rent high-tech.