Throughout the development trajectory of the entire photovoltaic industry, there have been “technical route iterations” at different times. From the past polycrystalline BSF aluminum backfield cells, to the "previous" mainstream PERC cells, to the current TOPCon, HJT and BC technologies. Among them, the improvement of battery conversion efficiency plays a key role in the overall situation and has become the ultimate goal pursued by everyone.

The theoretical limit efficiency of monocrystalline silicon cells is 29.56%. Chen Gang, chairman of Aixu Co., Ltd., led his team to find among hundreds of thousands of technology combinations that the technology closest to the theoretical limit efficiency is n-type ABC technology.

"Choose, give up, choose again, give up again, through continuous experiments, find the best technical route, and develop n-type ABC technology based on the principle that once the ecological chain matures, the cost will be lower than other current technologies. This is not a bet It’s something that must be done,” Chen Gang said.

Take the initiative to open up the ABC technology ecological chain

First of all, at the equipment level, because ABC is an advanced new technology, traditional equipment cannot meet the manufacturing needs of BC technology batteries; secondly, at the silicon wafer level, ABC silicon wafer quality requirements are higher, and the traditional Czochralski method (RCZ) was originally used. , it has been difficult to keep up with the development of battery technology and to prepare ultra-high-efficiency crystalline silicon cells.

In order to better promote the implementation of ABC technology, Aixu cooperates with material and equipment suppliers to conduct new research and development or upgrades. According to reports, the new generation silicon wafer technology developed by Aixu, the lightly doped superconducting magnetron Czochralski method (LD-MCZ), has broken through the two major challenges of resistivity control and wire breakage control, and produced silicon wafers with the highest oxygen concentration. Below 10 ppma, the minority carrier lifetime is above 10,000 μs, which is nearly 10 times higher than that of RCZ.

This truly high-quality silicon wafer with high resistance and low oxygen has opened the way for crystalline silicon cells to break through to a mass production conversion efficiency of more than 27%, and also laid an important foundation for the advancement of cell and component technology.

Staying ahead of the curve, technological innovation and mass production

Leading "paranoid" and "lonely brave" all love innovation, and at Aixu, the management focuses on three aspects of innovation: product technology innovation, engineering manufacturing capability innovation and industrial chain ecological innovation.

"BC batteries have hundreds of positive and negative electrodes arranged on the back, which is extremely complex, and it also means that our technology can make disruptive innovations." The person in charge said that Aixu uses 0BB technology, which is thinner and more numerous. Multiple welding ribbons are directly connected to the fine grid, replacing the original main grid and directly collecting the fine grid current, which can better collect current, realize interconnection between cells, and effectively reduce power generation losses after cracks.

Disruptive innovation, photovoltaics will usher in the next prosperous technology era

First of all, from the perspective of global market demand, the global newly installed photovoltaic capacity will continue to grow in 2024, but the growth rate may slow down compared to 2023; from the perspective of production capacity supply, due to the rapid expansion of production and production in the past few years, With the continuous implementation of new production capacity, the industry is accelerating the clearance of backward production capacity, which will cause some companies to face survival pressure or go bankrupt.

"Use disruptive innovation in technology and engineering manufacturing capabilities to lead the industry into the next prosperous technological era." Chen Gang added, "In terms of product innovation, we must think with extreme thinking. In the future, we will make every square meter The sunlight on the land turns into energy, making each square meter of modules more powerful and each watt of power generated by the modules higher, driving the prosperity and development of the n-type extreme technology era and bringing surging power to the zero-carbon society. ”trina solar panels