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Perovskite has been pointed out as the technological leap that can break the silicon barrier in solar energy. Applied as a thin film and combined with silicon in tandem panels, it has already reached 29.51% efficiency in a certified module. GCL and LONGi lead the global race for industrial scale of this new generation of perovskite cells.
On June 2, 2025, GCL Optoelectronics, the Chinese division of the GCL group specializing in photovoltaic materials, announced it had achieved 29.51% efficiency in a 2,048 cm² perovskite and silicon tandem solar module, a result certified by the National Institute of Metrology of China and reported by specialized outlets such as PV Magazine International. About three weeks later, on June 26, 2025, the same company inaugurated in Kunshan, Jiangsu province, the world’s first gigawatt-scale factory exclusively for producing tandem modules with perovskite, with a total investment of 700 million dollars, an initial capacity of 1 GW, and a goal of reaching 2 GW per year of output.
The movement symbolizes the beginning of a new phase in the history of solar energy, where silicon, the base of the photovoltaic industry for more than 50 years, gains a partner capable of overcoming its physical limitations. Perovskite does not replace silicon but combines with it in panels called tandem, where two layers of cells absorb different ranges of the solar spectrum. Technical studies gathered by specialized literature indicate that the theoretical efficiency limit for this type of panel can be between 43% and 45%, much higher than the approximately 33.7% of single-junction silicon, opening a new window for the global expansion of photovoltaic solar energy.
What is perovskite and why it can revolutionize solar energy
Perovskite is the name given to a family of minerals and crystalline compounds with a specific chemical structure, originally identified in the 19th century from the mineral CaTiO3 discovered in the Ural Mountains. For use in solar cells, the material is replicated in the laboratory from metal halides such as lead iodide combined with organic or inorganic cations. The result is a compound that has an optical absorption coefficient up to ten times greater than silicon, which allows the use of an extremely thin layer, just a few micrometers thick, to capture enough sunlight to generate electricity.
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The first functional perovskite solar cell was developed in 2009 by Japanese professor Tsutomu Miyasaka from Toin University of Yokohama, with an efficiency of about 3.8%. In just over 15 years, commercial modules have reached levels above 19% efficiency in the laboratory, a leap that silicon took decades to achieve. In January 2024, MIT Technology Review listed perovskite cells among the ten revolutionary technologies of the year, second only to artificial intelligence. This data shows how much the technical community sees perovskite as the next natural step for the photovoltaic industry.
Why silicon is reaching its physical limit
Crystalline silicon, the basis of the vast majority of solar panels in operation worldwide, has a physical ceiling known as the Shockley-Queisser limit, calculated at around 33.7% for single-junction solar cells. In practice, current commercial modules deliver between 20% and 24% efficiency, and the main recent advances in the sector, such as PERC, TOPCon, HJT, and back contact technologies, have been gradually pushing this number closer to the theoretical limit, but with diminishing returns with each generation.
PERC added a reflective layer on the back of the cell and contributed a jump of about 4 percentage points in average efficiency. TOPCon brought more sophisticated engineering, with a tunnel oxide layer and doped silicon, adding another 4 points. In parallel, the transition from P-type to N-type cells reduced degradation over the years. Despite this, all these technologies remain silicon-based and face diminishing returns today. It is precisely because of this plateau that perovskite has gained so much space on the global research agenda.
How tandem solar panels with perovskite and silicon work
The tandem solar panel is a two-layer structure: the upper layer, made of perovskite, captures shorter wavelengths of sunlight, such as blue and violet. The lower layer, made of silicon, absorbs red and infrared light, which escapes from the first layer. Since each material works best in a specific range of the spectrum, the sum of the two cells generates much more electricity per square meter than any traditional panel based solely on silicon.
This combination is today the most promising front in solar energy research. In 2024, the Chinese company LONGi announced a record efficiency of 33% in a large-area tandem perovskite and silicon cell. In 2025, GCL reached 29.51% in a complete module of 2,048 cm², a result that already considers real losses of area and interconnection between cells. The theoretical limit of tandem cells with these two materials is estimated to be around 43% by technical literature, and some more optimistic projections, with additional layers, cite up to 45%. The jump compared to today’s silicon modules, in the range of 22% to 24%, is considerable and justifies the global interest in tandem technology.
The advancement of industrial manufacturing: GCL’s 2 GW factory in China
The big turning point for perovskite happened in the transition from laboratories to industrial lines. In June 2025, GCL Optoelectronics inaugurated in Kunshan what is considered the world’s first gigawatt-scale factory for tandem modules with perovskite. The total investment was 700 million dollars, with an initial capacity of 1 GW and a goal to reach 2 GW of annual production, manufacturing large-size modules, each with an area of 2.76 square meters.
In October 2025, according to GCL Tech itself, the first full-size perovskite module, with dimensions of 2,400 millimeters by 1,150 millimeters, came off the company’s gigawatt production line, marking what the company called the formal entry of the technology into a new era of global mass commercial production. GCL stated, in a release, that its strategy combines large-scale production with demonstrations in different climatic scenarios, in pilot projects distributed across various countries. The projected cost is about 0.075 dollars per watt, approximately half of the current 0.15 dollars per watt of conventional crystalline silicon modules.
The challenge of durability and international certification
For years, the main question about perovskite was durability. The first prototypes made in the laboratory degraded quickly when exposed to humidity, oxygen, and ultraviolet radiation. The solar sector is demanding: commercial modules usually have a warranty of 25 to 30 years of operation, and any technology that cannot survive this interval hardly finds a large-scale market. This was, for years, the major obstacle to the commercialization of perovskite cells.
This scenario began to change. GCL reports that its perovskite research lines have been advancing for more than 12 years and that the patented chemical formula in 2023 brought significant gains in stability. The technology now has international certifications, such as IEC 61215, aimed at performance, and IEC 61730, focused on electrical safety, in addition to tests three times more rigorous than IEC 61215 conducted by TÜV Rheinland. These certificates are considered the minimum threshold for any module intending to be installed in commercial or residential projects around the world, and they pave the way for the acceptance of perovskite technology in the regular market.
The role of artificial intelligence in the mass production of perovskite
Another decisive component for enabling the industrial scale of perovskite is artificial intelligence. GCL itself announced, back in 2025, what it classifies as the world’s first AI-controlled perovskite cell production system. The line uses 52 precision sensors and a decision engine based on machine learning algorithms, producing about 300 cells per day and analyzing 1,800 high-precision data sets in the same period.
According to the company, this system reduces the time to transfer laboratory findings to the factory by up to 90%, a historically slow step in the photovoltaic industry. The performance variation between batches was below 0.75%, a relevant indicator for production stability and standardization of the final product. The combination of AI with chemical deposition processes transforms perovskite into something akin to a functional paint, applied on surfaces by methods reminiscent of industrial printing, and paves the way for applications previously closed to silicon, such as modules on building facades, glass, curved roofs, and portable devices.
The impact of the new generation of solar panels for the consumer
For the end consumer, the arrival of tandem panels promises important practical impacts. Panels with 30% or more efficiency can produce the same energy in a significantly smaller area, reducing the need for large roofs and opening space for applications in smaller homes, commercial buildings, and even vehicles. On an industrial scale and in solar plants, this means less land occupied per gigawatt installed, with a direct effect on environmental licensing and the total cost of projects.
Another relevant gain is the weight. Modules based on thin-film perovskite are naturally lighter and more flexible than traditional silicon panels, which can exceed 25 kilograms each. On roofs with low structural capacity, such as old warehouses and popular residences, this changes the viability equation. There is also potential to reduce the use of silver, an expensive material present in the electrical contacts of current modules, helping to lower the final cost of solar photovoltaic energy on a large scale across all continents.
Perovskite does not come to dethrone silicon, but rather to add to it. Tandem panels that combine the two materials are expected to be the main bet of the solar industry for the next decade, with Chinese manufacturers like GCL and LONGi leading the way from research to mass production. The first commercial units are already coming out of gigawatt factories and should reach international markets throughout 2026, in a movement that promises to redesign the size, weight, and cost of photovoltaic systems in Brazil and around the world.
Have you considered installing panels with perovskite technology at home or in your business? Do you believe that this new generation of tandem cells can really lower the cost of solar energy in Brazil? Leave your comment, tell us if you already have panels installed and what your experience is, and share the article with those who follow technology, clean energy, and global energy transition.
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