Beijing time, Longji Green Energy officially announced at Intersolar Europe 2023 that, certified by the European Solar Energy Testing Agency ESTI, Longji Green Energy has achieved 33.5% conversion efficiency of crystalline silicon-perovskite tandem cells on commercial-grade textured CZ silicon wafers.
Earlier, on May 24, Longji Green Energy just announced that it had achieved 31.8% conversion efficiency of crystalline silicon-perovskite tandem cells on commercial-grade textured CZ silicon wafers. This means that in less than a month, Longji has once again increased the absolute value of the efficiency by 1.7 percentage points.
It is understood that 33.5% is the highest efficiency of crystalline silicon-perovskite tandem cells based on commercial CZ silicon wafers, which once again demonstrates the significant efficiency advantages of crystalline silicon-perovskite tandem cells as a new battery technology. The theoretical efficiency limit of
crystalline silicon solar cells is 29.4% , and tandem solar cells are recognized by the industry as the main technical way to break through the efficiency limit of crystalline silicon. Previously, the international authoritative certification efficiency of stacked batteries developed by Longji Green Energy exceeded 25.7% and 29.55% in 2021 and 2022, respectively, and was selected as the "China's Highest Efficiency Table of Solar Cells" issued by the Photovoltaic Professional Committee of the China Renewable Energy Society in that year, representing the highest efficiency level of the battery technology in China. According to the team that broke through the efficiency of stacked batteries, from December 31, 2022 to June 14, 2023, the team increased the efficiency from 29.55% to 33.5%, achieving an absolute increase of 3.95% in nearly half a year.
Since April 2021, Longji Green Energy has refreshed the world record of solar cell efficiency 14 times, and is the founder of the world record of silicon solar cell conversion efficiency. Previously, the conversion efficiency of silicon heterojunction cells independently developed by Longji Green Energy reached 26.81%, breaking the world record of dust-laden silicon cell efficiency for five years.
Solar cell efficiency is the beacon of photovoltaic technology innovation, and every breakthrough of 0.01 is full of challenges. Longji Green Energy Team is one of the earliest teams in China to carry out research on laminated batteries. For industrial development, Longji Green Energy Team has broken through key technologies such as crystal growth of perovskite thin film on textured silicon substrate, high-efficiency bulk phase passivation and optical management, and achieved rapid improvement in the efficiency of silicon-based tandem cells.
" Since the development of the photovoltaic industry , no matter how the external environment changes, there are still two core indicators that remain unchanged, that is, reducing costs and increasing efficiency is still the eternal theme of the photovoltaic industry ." Technological innovation is still the core driving force for the cost reduction of photovoltaic power. Li Zhenguo, founder and president of Longji Green Energy, said, "Sunshine is fair to everyone, and photovoltaic power generation is born of light.". As a global inclusive energy, photovoltaic is bringing light and well-being to all countries and regions around the world. Over the past decade, photovoltaic has become the most economical type of energy in most countries in the world because the cost of electricity has dropped by more than 90%.
"The same area, absorbing the same light, of course, the more electricity it can emit, the better." Li Zhenguo said that taking the battery as an example, on the basis of 20% conversion efficiency, it is estimated that every percentage point increase in conversion efficiency can save more than 5% of the cost for downstream power plants. Therefore, even a 0.01 percentage point increase in battery conversion efficiency is significant.
For this reason, in the past 23 years, Longji Green Energy has adhered to the main line of scientific and technological innovation, insisted on the rapid transformation of advanced technology into advanced production capacity, and made continuous technological innovation "possible and feasible". In this regard, since its listing in 2012, Longji Green Energy has invested 19.5 billion yuan in R & D and obtained 2132 patents.
At Intersolar Europe 2023, the silicon heterojunction conversion efficiency 26.81% world record concept product independently developed by Longji Green Energy in November 2022 was also displayed on the exhibition stand.
This concept product, named 2681, weighs 31.8 kg, has a product size of 2278 mm × 1134 mm, and generates more than 600 W.
It is reported that from laboratory data to conceptual products, Longji Green Energy Team only spent half a year. The landing of the concept product also means that the product is closer to mass production.
It can be seen that every technological breakthrough of Longji Green Energy is not based on the data advancement of the laboratory, but guided by industrialization, which rapidly introduces the advanced frontier technology into mass production worldwide, so as to promote the technological upgrading of the whole industry.
"It is the mission of Longji Green Energy and the greatest goodwill in the management philosophy of Longji Green Energy to make the achievements of photovoltaic science and technology benefit mankind." Li Zhenguo said.
With "carbon neutrality" becoming a global consensus, photovoltaic has come to the center of the stage of global energy transformation and transformation, and is expected to become the main force of global "carbon neutrality". In the next 30 years, the global average annual photovoltaic installed capacity is expected to reach more than 1000 GW, and photovoltaic officially ushered in the "terawatt era".
Therefore, photovoltaic enterprises or industries should try their best to protect themselves from the outside world, return to the main track of improving battery efficiency, strengthen investment in research and development of new battery materials and technologies, do a good job in technological innovation, devote themselves to reducing costs and increasing efficiency, enhance the competitiveness of photovoltaic industry, and promote large-scale application of clean energy. This is the top priority of the current and future development of China's photovoltaic industry.
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