
We’ve all seen those solar panels glittering on rooftops, but did you know today's versions produce 40% more energy than 2015 models while costing half as much? The International Energy Agency reports solar now accounts for 4.5% of global electricity – triple 2019 levels. Yet here's the rub: traditional silicon cells hit their practical efficiency ceiling at 29%, and we're already at 26% in commercial products. So where's the next leap coming from?