How tandems split the solar spectrum

Perovskite solar has long promised step-change efficiency, yet manufacturing hurdles kept it in the lab. Scott Graybeal and his team at Caelux are changing that. By adding a thin perovskite “active glass” layer to conventional silicon modules, the company unlocks 30–40% more power output while cutting overall project costs, without rebuilding the solar industry from scratch.

In this episode of Hardware to Save a Planet, host Dylan Garrett speaks with Scott Graybeal, CEO of Caelux, about why perovskites represent a structural shift in solar economics. Scott explains how tandem cell architectures split the light spectrum to dramatically increase energy harvest, and why adding just a few cents per watt can transform 25-year project cash flows and lower the levelised cost of energy. 

He also outlines Caelux’s manufacturing roadmap toward high-volume production, applying Wright’s Law through disciplined process optimisation rather than one-off breakthroughs. The conversation also explores the company’s partnership strategy with incumbent module manufacturers, the changing geography of solar production, and why the next decade could determine whether solar becomes truly ubiquitous infrastructure.

Scott Graybeal is the CEO of Caelux, a clean energy company specializing in perovskite-based solar technology. With over 15 years of experience in the solar and energy industries, including seven years leading the energy solutions segment at Flex, a major global manufacturer, Scott brings deep expertise in advanced manufacturing and clean energy innovation. He joined Caelux in 2021 to commercialize perovskite tandem solar cells, a breakthrough technology promising 30% more power generation in the same space and 20% lower project costs.

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