Experts create cold photovoltaics for the first time in history — No sunlight required to produce this odd, inverted energy effect

You’ve always associated solar power with heat, bright sun, and hot panels. But what if some of the most exciting progress in photovoltaics isn’t about capturing more heat, but getting rid of it?

It may sound backwards, but researchers are now experimenting with systems that generate power by using cold instead of warmth.

Early results suggest solar technology may soon work in ways that would have seemed impossible to us just a decade ago.

Photovoltaic energy, as old as it’s necessary

Solar power isn’t new. It stretches back nearly two centuries to the discovery of the photovoltaic effect, the phenomenon that results in light becoming electricity. 

Since then, photovoltaic energy has evolved into one of the most important clean technologies at our disposal. What started as tiny experimental cells has grown into sprawling solar farms and rooftop arrays that are quite common.

Today, tens of thousands of solar installations across the U.S. generate hundreds of terawatt-hours of electricity each year, and that’s just the beginning.

Experts have run the numbers and the potential is staggering — if solar panels were widely deployed across America’s rooftops and open land, photovoltaics could someday supply a huge chunk of the nation’s electricity needs.

“Cold photovoltaics”, discovered for the first time in history

For ages, people thought photovoltaics needed only one thing: sunlight. That’s how solar tech has worked since the early experiments in the 1800s.

But scientists have been quietly turning that idea around.

In the last few years, researchers have figured out how to make “cold photovoltaics” — systems that tap into cold rather than sunlight to produce energy.

The trick lies in a natural process called radiative cooling, where surfaces facing the open sky can dump heat into outer space, creating a temperature difference that can drive electricity generation. Stanford University labs have already showcased devices that produce power at night by using this cooling effect instead of sunlight.

A global research team from countries including Nigeria, Pakistan, Malaysia, and beyond has taken that concept further, laying the groundwork for PV tech that could work by reversing sunlight — a true cold-powered photovoltaics breakthrough that once sounded impossible.

From hot to cold photovoltaics: Never seen since the discovery of solar power 

This is the point where solar energy gets flipped upside down by being cooled instead of heated.

For nearly two centuries, solar tech has chased the same enemy: heat. When photovoltaic cells get hot, they become less efficient. Researchers are working on a solution that doesn’t just manage heat, but cleverly sucks it away without any extra energy input.

That’s where the recent breakthrough from the comprehensive review comes in

Scientists want to use radiative cooling — a passive process where surfaces emit heat into the cold of outer space — together with next-generation PV systems to boost performance instead of just limiting loss. The study can be found on Science Direct.

There’s much more than solar panels

Radiative cooling materials, photonic structures, and advanced coatings can significantly reduce operating temperatures for PV modules by releasing thermal energy directly into space, even under the sun, improving efficiency and longevity.

What feels truly historic is that the review shows that radiative cooling could now be practically integrated into real photovoltaic systems, especially tandem and perovskite cells.

That means solar panels stay cool while they generate power — a reversal of the old paradigm where heat was always the enemy and a groundbreaking step toward “cold photovoltaics.”

For decades, solar meant chasing the sun while finding a balance fighting excess heat. Now, it may also mean using cold as an ally.

If radiative cooling can be scaled up, panels won’t just tolerate heat — they’ll actively shed it to improve performance. That’s a subtle shift with big implications for efficiency and lifespan.

You may still picture solar as hot and bright. But the next leap forward could come from what happens after the heat escapes, and become one of the recent innovations that changes the story of how sunlight becomes power.