For decades, the familiar blue or black silicon solar panels have been the symbol of clean energy, the engine of the energy transition. In recent years, though, the established technology has started to show its cracks: beyond a certain efficiency threshold, silicon simply cannot go any further.

That ceiling has pushed researchers to look for an alternative in perovskite (calcium titanate), a mineral first identified in 1839 in the Ural Mountains by German mineralogist Gustav Rose. It is a crystalline material capable of absorbing light with unprecedented effectiveness, and it is remarkably easy to print onto flexible surfaces at low cost.

How a solar cell works, and why perovskite beats silicon

A photovoltaic cell is a stack of ultra-thin layers, each with a precise job. When solar radiation reaches the central material, it generates electrical charges (electrons); these then have to cross the electron transport layer (ETL) to be channeled outward and converted into the electricity that feeds our grids.

When that central core is made of perovskite rather than silicon, the jump in performance is stark. The mineral absorbs light better and is far more versatile to manufacture. Silicon taps only a limited portion of the solar spectrum and requires rigid wafers processed at extremely high temperatures; perovskite, by contrast, captures a much wider range of wavelengths, including diffuse or weak light.

On top of that, the mineral can be dissolved into a fluid and printed like an ink onto thin, bendable films, making it possible to produce ultralight modules that can be integrated into glazing at a fraction of the manufacturing energy cost. The catch: when exposed for long periods to constant heat, humidity, and strong light, the perovskite structure tends to degrade quickly. That is why, despite its superior performance, the material was for years not seriously considered for large-scale solar manufacturing.

The weak spot of next-generation solar: the C60 obstacle

Until now, to build the ETL inside perovskite cells, the industry has relied on a standard carbon-based molecule known as C60 (a fullerene). While this delivers high efficiency in controlled laboratory tests, things change radically once you move to mass production.

Research by the National Renewable Energy Laboratory (NREL) and Arizona State University has pinpointed the interface between the perovskite and the C60 as a primary cause of voltage loss. C60 also has low fracture energy and, under thermal swings and outdoor wear, ends up causing the layers to separate, a process known as delamination.

The Sofab Inks breakthrough

The company that changed the game is US startup Sofab Inks, based in Louisville, Kentucky, which recently announced a $6 million seed funding round. The deal was led by Cloudberry Ventures, a venture capital firm founded by former Google executive Mahir Sahin.

The company has patented a way to replace C60, using a technological ink made of metal-oxide nanoparticles called Tinfab. As CEO Blake Martin explained, Tinfab’s nanoparticles bind to the cell structure six to ten times more firmly than the fullerene, delivering stability without sacrificing efficiency.

The Tinfab-based modules were put through accelerated aging tests, exposed for 1,300 hours to 1,000-lux illumination, 85% relative humidity, and a temperature of 65°C (149°F). The result was impressive: the technology maintained normalized efficiency close to 100%. Applied to single-junction modules measuring 30 centimeters (about 12 inches), the new layer recorded a conversion efficiency of 22.3%.

With the fresh $6 million, Sofab Inks now aims to triple its engineering team and scale production up to a hundredfold, adapting the Tinfab material to standard commercial panels (1 by 2 meters, roughly 3 by 6.5 feet). The startup says it is already in talks or collaborating with about 90% of the industry’s players, backed by strategic partners for industrial printing and the production of its first modules, an effort to turn perovskite into a genuine commercial reality.

Editor’s note

This article was originally published in Italian on money.it by Emanuela Ceccarelli on August 08, 2026 as «Perovskite, il materiale che vuole sostituire i pannelli solari tradizionali». It has been translated and adapted for an international audience by the Money.it International desk.