AI Summary
5 min readIn 1954, Bell Labs invented the first silicon solar cell, achieving roughly 5-6% efficiency. More than seven decades later, commercial silicon cells have pushed toward 26% efficiency, but they are now bumping into a fundamental thermodynamic limit of about 30% for any single material. The solar industry has a clear ceiling, and the technology that most experts believe can break through it is a class of crystals called perovskites. Joel Jean, CEO and co-founder of Swift Solar, explains that perovskites are the first material since silicon that can both exceed its efficiency and be cheaper to manufacture. The catch: nobody has yet proven a perovskite solar cell can survive 30 years outdoors. That is the race the US, China, and Europe are in right now.
How China came to dominate solar
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What you'll learn
- 1 (00:00) **Solar’s Woe and Hope** – Introduction to the episode’s central tension: U.S. has fallen behind China in solar manufacturing, but a new technology (perovskites) could create a competitive opening.
- 2 (02:56) **The Big Picture: U.S. Invented It, China Scaled It** – Joel confirms the listener’s impression of solar history and adds nuance.
- 3 (08:11) **Solar Cell vs. Panel Explained** – A clear breakdown of the core components of solar technology.
- 4 (10:44) **How Solar Efficiency Improves and Why It’s Hitting Limits** – Joel explains the mechanisms for boosting efficiency and the fundamental physical ceiling.
- 5 (14:41) **Efficiency Isn’t the Goal—Cost Per Kilowatt-Hour Is** – Joel reframes the metric that actually matters for solar adoption.
- 6 (17:22) **Why the U.S. Lost Its Lead in Solar** – A historical look at U.S. policy, oil company involvement, and China’s consistent strategy.
- 7 (20:04) **Did China Intentionally Destroy the Competition?** – Joel considers whether China’s strategy was master-planned or emergent.
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Show Notes
In this episode, Ashlee sits down with Joel Jean, CEO of Swift Solar, a San Carlos-based startup trying to create new solar technology using perovskite. We previously published a story about Swift, if you’re wondering what the f*ck perovskite is! In short, it’s a synthetic crystal that turns sunlight into electricity better and cheaper than the silicon currently used in solar panels. This stuff is finicky though, and experts have doubts, as they always do — but Jean explains how Swift is closing in on a solution.
“Everyone and their mom can make a perovskite that’s decently efficient,” Jean says, but no one seems capable of making it as durable as silicon. The material degrades under heat, light and its own moving ions. This is obviously not the ideal situation for an energy grid.
So why not stick with silicon? Well, the laws of physics haven’t quite blessed it. A silicon panel can turn, at most, about 30 percent of the sunlight it gets into electricity, and today’s panels usually churn out about 25 percent. If they’re able to successfully layer perovskite on top, that pushes the ceiling to 45 percent.
These are fabulous gains in the solar nerd world, and we could really use some innovation here because we are one very, very energy-hungry species. And of course, this is Core Memory, so you know where this is headed: China and AI.
China makes 90 percent of the world’s solar cells and wafers, installs more panels than the rest of the planet combined, and builds the machines that nearly every U.S. solar factory runs on. (Except for Swift, apparently!). That dependency is, as always, a risk.
Meanwhile, AI data centers need more power than God, and the folks making models are happy to welcome any new gains in that department. Some are even putting their money on it; renowned AI researcher Jeff Dean has invested Swift.
Charge your crystals, folks. We’re perovskite-maxxing.
IN THIS EPISODE
This Is The U.S.’s Last Chance At Solar — Core Memory
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