On March 28, LONGi officially released Tairui wafer products to the public, and announced that it had completed a large number of research and development and system patent layout, and was ready for full production.

▲ LONGi Tairui silicon wafer was officially released

LONGi Tairui silicon wafer products are the result of three years of dedicated research and development by hundreds of LONGi technical engineers. They have achieved breakthroughs without substantial innovation in silicon wafers in the past ten years and have become the vane of technological development in the silicon wafer field.

Over the past ten years, major breakthroughs have been made in the technology and cost of photovoltaic power generation. Photovoltaic power generation has become the fastest growing renewable energy source in the world, and global photovoltaic has entered the "Taiwa era." Li Zhenguo, founder and president of LONGi Green Energy, said that the rapid development of the photovoltaic industry lies essentially in the continuous reduction of electricity costs. Reducing costs and improving power generation efficiency are the "first principles" of the photovoltaic industry.

Thanks to the rapid development of the photovoltaic industry, the development of photovoltaic silicon wafers is also relatively rapid. Silicon wafer is an indispensable substrate in battery development. Its quality directly determines the yield of downstream battery cells and also directly determines the conversion efficiency of battery cells. However, in recent years, with the continuous improvement of silicon wafer production technology, the performance improvement of silicon wafers has become slower and slower, and the homogenization of silicon wafer products has become more and more obvious.

However, LONGi still insists on continuous research and development to further improve the performance of silicon wafers, meet today's demand for high-quality silicon wafers for high-efficiency batteries, and help customers create maximum value.

According to Wang Yichun, product research and development director of the R & D center of LONGi Wafer Business Department, LONGi Tairui Wafer has three major significant advantages:Full platform support, high resistance concentration and good gettering effect. In addition, as a new type of silicon wafer, LONGi Tairui silicon wafer products have more potential advantages waiting to be verified.

▲ LONGi Tairui silicon wafer

As a series of products, LONGi Tairui silicon wafers cover a variety of product segments and can support a variety of battery routes, covering the current mainstream high-efficiency batteries in the market-HBC, TBC, HJT, TOPCon, etc., and can simultaneously provide multiple market needs. The mainstream size specifications can also meet customers 'different thickness needs.

The longer the conventional silicon rod, the greater the difference in the resistivity between the head and tail. The long-term ideal pursued in the single crystal field is to have longer silicon rods and more concentrated resistance distribution. LONGi Tairui silicon wafers can achieve consistent axial resistance distribution without shortening the rod length that RCZ (repeated feeding Czochralski single crystal) should have been prepared. The head and tail resistance ratio of the produced crystal rods can be reduced from 3 times to less than 1.5 times, achieving a relatively more concentrated distribution of battery efficiency, more high-efficiency batteries, more high-quality products, and improving the difference between light and dark sheets at the component ends.

In addition, metal impurities in LONGi Tairui silicon wafers are easier to be absorbed, which has greater room for efficiency improvement compared with conventional products. With the optimization of the gettering process, the greater the potential for gettering gain and the greater the potential for improving battery efficiency.

In addition to the above-mentioned electrical performance advantages, LONGi Tairui silicon wafers also have stronger mechanical properties. Tests have verified that the bending strength of LONGi Tairui silicon wafer can be increased by 16% compared with conventional products, and its fracture resistance is stronger. This will help thin slices and is expected to reduce the fragmentation rate in the manufacturing process.

▲ LONGi Tairui silicon wafer

Single crystal silicon wafers have always been LONGi's traditional advantageous product, ranking first in the world in shipments for nine consecutive years. In recent years, the silicon wafer chain has undergone upgrades in single crystal, large size and thin slices, and LONGi has participated in every technological change.

All along, LONGi Wafer Business Department has always insisted on putting customers first, insisting on leading standards, reliable quality, and excellent product and service experience, winning the trust of customers. According to Hao Kai, president of LONGi wafer business unit, LONGi wafer customers have a saying:"There are two types of silicon wafers in the photovoltaic industry, one is LONGi silicon wafers, and the other is other silicon wafers."

However, LONGi is not satisfied with customers 'praise for "LONGi silicon wafers", but insists on pursuing excellence in product performance and striving for excellence. Li Zhenguo said:"We will continue to adhere to technology-led and innovation-driven, pool resources, continue to deepen our efforts in the photovoltaic field, and continue to launch more efficient and reliable products to help create new photovoltaic productivity."