30 October 2026

^{Glass-based perovskite photovoltaics under development by Panasonic Holdings Corporation is a type of building-integrated photovoltaics (BIPV) that generates electric power while enhancing architectural aesthetics (image: Panasonic)}

 

A warehouse roof catches abundant sunlight, yet often lacks the load-bearing capacity for conventional solar installations. For owners, this unused space represents a missed opportunity to generate electricity close to demand. Perovskite solar films potentially offer the breakthrough: these lightweight, thin-film photovoltaic devices can be deposited on flexible foils, easily contouring to curved surfaces and overcoming structural limitations. Related glass-based products target windows and façades, expanding power generation far beyond the roof.

Early commercialisation is officially underway. Japan’s Sekisui Chemical has launched its flexible solar film business, while Panasonic reports it began selling early glass-based products in September 2026. Large-scale deployment now rests on how reliably these integrated products generate electricity once built directly into structures.

 

How perovskite solar cells work

 

The name traces back to 1839, when German mineralogist Gustav Rose named a Ural Mountain mineral after Lev Perovski, a Russian nobleman and patron. This mineral, calcium titanate, lent its name to a family of synthetic materials sharing the same basic crystal structure.

Perovskite cells utilise metal-halide compounds, tailored specifically to optimise light absorption. Sunlight excites electrons within this absorber; neighbouring layers separate and collect the electrical charges, which electrodes route into an external circuit. This powerful absorption enables an active layer significantly thinner than standard crystalline-silicon wafers.

Manufacturing starts with precursor inks deposited onto a substrate, processing into a crystalline film. Completing a functional module requires charge-transport layers, electrodes, electrical cell connections, and protective packaging. These layers must seamlessly work together.

 

Perovskite solar films for roofs, windows and façades

 

Conventional silicon panels benefit from mature manufacturing and established installation practices. Flexible perovskite products target applications where their low weight and versatile shape offer a distinct advantage, including roofs with limited structural capacity and curved construction surfaces.

Sekisui’s SOLAFIL business initially targets metal roofs. On 27 March 2026, Sekisui Chemical and its subsidiary Sekisui Solar Film announced the start of commercialisation after establishing their manufacturing technology and preparing installation specifications. Initial supply targets include Japanese municipal and infrastructure projects.

An earlier installation demonstrates how these films serve specific electricity demands. At Expo 2025 in Osaka, Sekisui fitted them to a 250-metre bus shelter roof, storing the generated electricity in batteries for night-time lighting.

To expand beyond this initial supply, Sekisui is prioritising a production line with 100 megawatts of annual capacity in the financial year beginning April 2027, following limited production using existing equipment in the preceding year.

While Sekisui’s initial commercial focus rests on metal roofing, Panasonic is incorporating a perovskite layer directly into architectural glazing. Inkjet coating and laser processing allow precise customisation of dimensions, transparency and patterns, whilst glass sealing helps protect the device.

On 20 October, Panasonic announced that sales of early production products had begun the previous month. It also brought forward its planned full-scale production start at Nagahama, Japan, to April 2029.

 

Commercial deployment and manufacturing scale-up

 

Developing these applications also requires a robust manufacturing base. In Europe, Perovion Technologies is working on flexible solar foils using technology originating at Dutch research organisation TNO. Launched in March 2026, the company outlined plans for a roll-to-roll factory to be constructed in the Netherlands in 2030. On 23 October, Perovion, TNO and Japan’s Toyo Seikan Group Holdings announced a joint development roadmap covering materials, manufacturing and module technology.

A separate TNO–ASAT demonstrator shows how seamlessly these cells can conform to construction products. In April 2026, TNO reported 12.4% conversion efficiency after applying a flexible module to a curved composite roof tile. Its next development priorities include lifetime, reliability and scalability.

Alongside flexible-film development, manufacturers are investing in larger perovskite module plants. China’s GCL Optoelectronics announced the commissioning of a gigawatt-scale production base in Kunshan in June 2025. Its stated capacity describes manufacturing potential rather than the volume of modules already delivered to customers.

Another route combines perovskite with silicon in tandem cells, allowing the two absorbers to harvest different parts of the solar spectrum. British company Oxford PV first shipped commercial panels to a US customer in September 2024, using cells manufactured in Germany. The company currently advertises approximately 25% module efficiency and a 10-year product and performance warranty for its second-generation modules, with volume manufacturing expected from 2027.

Oxford PV’s rigid tandems seek more electricity from a given area, whereas flexible films expand the range of surfaces available for generation.

 

Perovskite solar cell durability and recycling

 

Both routes must address degradation caused by heat, moisture, light and electrical stresses. Flexible products present a particular packaging challenge: barriers and edge seals must protect sensitive layers whilst accommodating bending.

A study published in Nature Communications in August 2024 illustrates how processing affects performance. Researchers controlled substrate temperature to slow crystallisation and form more uniform films. An additional laser-scribing step allowed existing layers to create a barrier at cell interconnections, reducing damaging reactions between perovskite and metal electrodes.

The team achieved a certified quasi-steady-state efficiency of 22.73% in a mini-module with a 14.61 cm² aperture, the illuminated area used for the measurement. A module retained more than 90% of its initial efficiency after 1,050 hours under simulated sunlight in nitrogen at approximately 40°C. Outdoor operation exposes products to a broader combination of stresses over much longer periods.

Many high-performing formulations contain lead, making containment and end-of-life handling part of product design. Protective packaging helps prevent release, while collection and recycling processes must accommodate damaged or retired modules. Researchers have demonstrated the recovery of lead and other valuable components, providing potential routes for their reuse.

 

Installation costs and lifetime electricity output

 

Reliability also shapes the economics for building owners, whose calculation includes installation, lifetime electricity production, maintenance and eventual replacement. Orientation and shading affect the energy delivered, while access can make façade repairs expensive if scaffolding is required. Japan’s New Energy and Industrial Technology Development Organization, or NEDO, highlights these construction costs alongside module prices in assessing commercial viability.

Back at the warehouse, a lightweight film could make a roof unsuitable for conventional panels productive. Its ultimate value will depend on how securely it can be fitted, how long it generates electricity and whether that output justifies the cost of keeping it there.

 

 

 

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