The history of photovoltaic development is essentially the history of photovoltaic technology innovation and development. Combing through the history of photovoltaic technology innovation in China and even in the world, there is one company that shines particularly brightly, and that is “LONGi”.

When it comes to LONGi, more labels will be “monocrystalline silicon leader”, “photovoltaic first stock”, “photovoltaic Mao”, but the author prefers to use “seeker” to describe LONGi, this trait has left the industry behind It is a legend about innovation and leadership.


Adhering to the core demand of photovoltaics to reduce costs and increase efficiency, LONGi’s actions have played a pivotal role in the key photovoltaic technology iterations in the past ten years.

16 years ago, when polycrystalline was favored by the market due to its cost-effective advantage, LONGi, a newcomer to photovoltaics, firmly set foot on the monocrystalline line that was not optimistic at that time. This decision is not impulsive, but stems from the “first principle” of the photovoltaic industry deeply insightful by the LONGi management team: the lowest cost per kilowatt hour.

Behind the counterattack of single crystal is the persistent innovation and silent persistence of LONGi for many years, until the emergence of a “thin line”, which completely allows single crystal to lead the industry pattern. Back in 2012, LONGi introduced the expensive and immature diamond wire slicing technology at that time, setting off a great technological innovation in the history of the photovoltaic industry – the diamond wire revolution. The data shows that after using diamond wire cutting technology, the cutting speed of single crystal silicon wafers is increased by 2-3 times, and with the reduction of loss, the wafer yield is increased by 15%. The adoption of diamond wire and other technologies has reduced the cost of single crystal slicing by 79% in 2019 compared with 2011, and the cost performance advantage of single crystal products has begun to become prominent.

Of course this is just the beginning. In order to accelerate the promotion and application of single crystal technology, in 2014, LONGi entered the downstream cell and module sectors, and took the lead in using PERC cell technology to push the single crystal efficiency to a high point.

The following story is well known. Driven by the national leader base, the value advantage of mono-Si PERC products has begun to emerge, and the proportion of products has risen steadily. PERC technology has become the best choice for production line upgrades in the photovoltaic manufacturing industry.

At that time, the issue of initial light decay was still plaguing the industry. In order to bring greater value to end users, LONGi chose to cooperate with partners to conduct in-depth research on the mechanism of light attenuation, and finally successfully solved the problem of light attenuation with LIR low attenuation technology, and made this technology public to the whole industry. In this step, LONGi has spearheaded the overall acceleration of monocrystalline technology, PERC+ double-sided, PERC+SE, PERC+ half-chip, and the PERC efficiency curve jumped up. According to public data, in 2019, the front-side conversion efficiency of LONGi monocrystalline bifacial PERC cells reached 24.06%, close to the efficiency limit of 24.5%. By the end of 2019, the market share of monocrystalline products had soared to over 65%, completing the counterattack against polycrystalline products.

Efficiency improvement is the lore weapon for the photovoltaic industry to reduce costs and increase efficiency, and reliable and standardized module size is also of great significance to the industry chain and customer value.

During this process, the figure explored by “Seeer” Longji was never absent. In 2019, LONGi launched Hi-MO4 products with 166mm silicon wafer size. It is estimated that compared with the 380Wp module using traditional M2 (156.75) silicon wafer, the 440Wp module using 166mm silicon wafer can save at least 5 points/W of BOS cost. Until 2021, the market share of 166 silicon wafers will still be nearly half.

In order to further meet the application demands of downstream customers for ultra-high power modules, LONGi has selected more than 100 locations around the world in 2020, conducted BOS cost estimation and reliability tests for modules of various specifications and sizes, and finally launched 182mm silicon tablet product. In LONGi’s view, the 182 size is the limit balance point between various constraints such as matching, return, risk, logistics, labor and so on. In 2021, 7 module companies with 182 capacity, including LONGi, will ship a total of about 39GW of 182 modules, accounting for one-fifth of global module shipments, and 182 products have jumped into the mainstream of the industry.


In the past 20 years, LONGi has created innovation legends in each industry with “persistence”. The efficiency record of Mercedes-Benz has continued to lead the rapid development of the industry, and the photovoltaic “leader” deserves its name.

As far as mainstream PERC technology is concerned, from 22.71% in 2017 to 23.6% in 2018, and then to 24.06% in 2019, LONGi continues to challenge the conversion efficiency limit of monocrystalline PREC cells. In 2020, LONGi announced that it can expect the mass production level of monocrystalline PERC cells to be close to 24% conversion efficiency.

Seeer LONGi Creating a Legend of Innovation with Perseverance

Be a stalwart and a breakthrough.

At the beginning of June 2021, when the market was arguing about the next-generation leading technology, LONGi announced that the N-type TOPCon battery, P-type TOPCon battery and HJT battery developed by LONGi set new world records in terms of efficiency. Shake the industry.

“LONGi has reserves and research on two new technologies, HJT and TOPCon. They are both monocrystalline silicon cells, and LONGi can still take advantage of monocrystalline silicon wafers. LONGi’s new product development is based on cost-effectiveness and customer value. Consideration.” According to the relevant person of LONGi, this is LONGi’s “persistence” in monocrystalline technology, and it is also LONGi’s breakthrough in monocrystalline technology based on customer value.

In fact, in 2021 alone, LONGi has broken the world record for photovoltaic cell conversion efficiency seven times, creating an innovative “miracle” that makes people admire. This continuous “phenomenal” innovation revolution also pushes the limits of human commercial application of solar energy to new heights. At present, LONGi has boosted the conversion efficiency of N-type TOPCon, P-type TOPCon and HJT cells to 25.21%, 25.19% and 26.30%, respectively, which also indicates that LONGi has achieved overall leadership in new high-efficiency battery technology.

Foreseeers are clear, forerunners are powerful. In the surging wave of photovoltaic innovation, LONGi’s new generation of battery technology is already gaining momentum. As the “wind vane” of photovoltaic technology development, what will be the next generation technology choices of LONGi? 2022 makes us look forward to it!