Laser tweaks could push solar cells past 26% efficiency

UNSW researchers didn’t invent a new solar cell—they found a way to fix the ones we already make. Their laser-enhanced contact optimization (LECO) process targets the Achilles’ heel of TOPCon cells: the contact layer where electrons leak and resistance builds. By zapping these interfaces with precision lasers and pairing it with optimized firing conditions, the team claims they can recover losses that typically cap efficiency at ~25.5%.

The trick isn’t just higher numbers—it’s how they’re achieved. Unlike heterojunction (HJT) or PERC cells, which require entirely new production tools, LECO works within existing TOPCon lines. That’s critical for manufacturers already betting on TOPCon as the next mainstream standard but watching its efficiency lag behind rivals. Early data suggests the method could push outputs past 26%, a threshold that would let TOPCon compete directly with premium technologies without the premium price tag.

Still, the real test isn’t the lab—it’s the factory floor. The study frames LECO as a ‘repair’ step, implying it could slot into current workflows with minimal disruption. But adding any process, even a laser pass, means recalibrating cost-per-watt calculations. The solar industry’s tolerance for extra steps is famously low unless the payoff is immediate and measurable.

For solar farm operators and panel buyers, the math is simple: if LECO delivers even a 0.5% absolute efficiency gain at scale, it translates to more kilowatt-hours per square meter—no extra land or mounting hardware required. That’s a direct hit to the levelized cost of energy (LCOE), the metric that actually moves procurement decisions. The catch? TOPCon’s current edge is its balance of performance and manufacturability; if LECO adds complexity, it risks undermining the very advantage it’s trying to amplify.

The broader solar ecosystem is watching closely. PV Magazine’s coverage notes that LECO could either accelerate TOPCon’s dominance or expose its limitations if scaling proves finicky. Competitors like Longi Solar and JinkoSolar, which have hedged bets across TOPCon, HJT, and PERC, may now face pressure to pick a lane. Meanwhile, equipment makers like Meyer Burger—already selling TOPCon production lines—could see LECO as a value-added upgrade or a threat to their margins if it requires new machinery.

What’s missing from the hype is the timeline. Lab-to-fab transitions in solar often take years, and TOPCon’s current ~25% average efficiency suggests LECO’s gains might arrive just as HJT costs drop further. The real bottleneck may not be the technology, but whether manufacturers are willing to tweak a working formula for incremental gains—or wait for the next big leap.