New Laser Tech Could Push Solar Panel Efficiency Past 26%

Solar panels are about to get a serious upgrade, thanks to a laser technique that fixes one of their biggest weaknesses.

Researchers from the University of New South Wales and Chinese solar specialist Laplace discovered that a process called laser-enhanced contact optimization (LECO) can dramatically boost the efficiency of TOPCon solar cells. These cells are already the workhorses of the solar industry, but they've hit a performance ceiling.

The problem has always been at the connection point where metal meets silicon inside the cell. This interface causes energy losses through something called recombination, where electricity essentially leaks away instead of flowing to your home.

LECO uses an intense laser pulse combined with electrical voltage to transform these weak connection points. The laser locally improves poorly formed contacts, creating better silver-to-silicon connections without needing extreme heat that can damage other parts of the cell.

The research team tested their approach on industrial TOPCon cells that started at 25.5% efficiency. By optimizing both the firing temperature during manufacturing and using LECO to fix contact issues, they pushed efficiency to 26.07%.

Here's what makes this exciting: the scientists reduced the fraction of metal directly touching the cell surface from 37% down to nearly 1%, without hurting the electrical connection. Less contact means less energy loss, and the laser fixes what would normally become a resistance problem.

Why This Inspires

This isn't just another incremental improvement in a lab somewhere. TOPCon cells are already being manufactured at massive scale worldwide, powering millions of homes and businesses.

The LECO process gives these mainstream solar panels a fighting chance against fancier, more expensive technologies like heterojunction and back-contact cells. That means the solar panels being installed today could get better without requiring entirely new manufacturing plants.

Lead researcher Bram Hoex emphasized that contact geometry is just as important as the materials themselves. His team provided practical guidance that manufacturers can actually use to balance different types of energy losses.

The research proves there's still room to squeeze more performance from today's technology while the next generation develops. Every percentage point of efficiency means more clean energy from the same amount of silicon, the same rooftop space, and the same sunlight.

Solar energy keeps getting better, and now we have a clear path to make it even more efficient.