Japan once again proves its leadership role in innovation, by testing technology, which can change the way, by which we think about photovoltaics. While traditional solar panels are heavy and fragile, the company's new developments PXP Corporation bet on chalcopyrite – mineral, which allows the creation of ultra-thin, lightweight and flexible solar modules.
Why chalcopyrite is the solar industry's 'hidden weapon'?
Chalcopyrite (compound of copper, indium and selenium, often denoted as $CuInSe_2$) is a cheap and widespread mineral. Its physical properties make it ideal for thin film photovoltaic systems. Unlike standard silicon panels, those of chalcopyrite:
- They don't need glass: This makes them extremely impact resistant and lightweight.
- Flexibility: They can be installed on curved surfaces - columns, arches and even vehicles.
- High efficiency in low light: They are also suitable for external installation, as well as for closed spaces.
Pilot projects: From the airport to the showroom
Two key demonstration projects are currently underway in Japan, that test the durability and effectiveness of this technology in real-world conditions.
1. Fukuoka Airport: Energy from the roof
The subsidiary of Kyushu Electric Power Company and the startup PXP installed glassless flexible modules on the roof of the Fukuoka International Airport terminal. The test site covers an area of $2 \times 6$ meters with a total power of 1,2 kW. The project aims to prove, that airport infrastructure can generate clean energy, without straining the structure of the buildings.
2. Nissan Yokohama: Solar aesthetics in architecture
The second project is in partnership with Nissan Motor Corporation. In a showroom in Yokohama, the panels are installed in two strategic locations:
- In the window area (to catch light indoors).
- On the curved surface of a supporting column at the entrance.
The energy generated powers vending machines, smartphone chargers and information displays, demonstrating how technology can be embedded directly into the urban environment.
Getty Images
Technical parameters: Unparalleled lightness
One of the most impressive advantages of PXP modules is their physical profile. In the table below, we see why they are revolutionary for the industry:
| Characteristic | Parameters of PXP chalcopyrite modules |
| Thickness | barely 0,6 mm |
| Weight | 0,7 kg/m² |
| Material | Chalcopyrite ($CuInSe_2$) and Perovskite |
| Application | Curved surfaces, windows, mobile structures |
Investments and the future of technology
The project enjoys strong government support through subsidies for next-generation solar cells. Last year, the Japanese giant Softbank Corp. led an investment round, providing 10 million dollars for the development of PXP.
Tests in Yokohama will continue until February 2026 G., with the objective being to evaluate how these thin film systems perform in different climates and locations. If the experiment proves successful, soon every surface around us – from the roof of the car to the facade of the block – can become a source of green energy.
"The aim is to raise awareness of the advanced nature of flexible solar cells and showcase the industry's environmental efforts", says Hiroki Sugimoto, CTO of PXP.
Follow along Geotopia for more news from the world of sustainable technology and innovation, that change the planet!
