Longi Solar: new efficiency for Topcon solar cell and introduction of a bifacial n-type Topcon solar modul

In addition to Jinko and other well- known manufacturers for photovoltaic products, the Chinese manufacturer Longi Solar also achieves a new efficiency for its Topcon solar cell and also places a new product on the market.  

In this article, we will take a closer look at Longi’s innovations.    

0.12 percent efficiency improvement for tunnel oxide passivation contact technology (Topcon) solar cell sets new record   

Longi announced it has achieved a 0.12 percentage point increase in just one month. At the beginning of May, the efficiency was 25.09 percent. Now, however, it stands at a new record of 25.21 percent. Back in May, the Chinese photovoltaic manufacturer mentioned that a solar  cell  based on such  technology  had surpassed  the  25  percent  mark  for  the  first  time. However, the technical background necessary to achieve this goal was not mentioned. Li Hua,  head  of  cell  research and development, explained that in order to achieve the respective targets, Longi always  tries to stay close to the essence of the technology. The  best  possible  technical  path  is  selected to maximize the performance potential of each product. In  addition,  necessary  changes  are always initiated immediately in order to be able to achieve the maximum of its own technical change. This  approach  currently  makes  Longi  the  world’s  largest  solar  manufacturer  in  terms  of market value and sales.  

Bifacial n-type  Topcon  solar  module  with an efficiency of 22.3percent storms the market

In addition to increasing the efficiency of the tunnel oxide topcon solar cell, Longi introduced a newproduct in June this year. This is a bifacial n type  topcon  solar  module  with  a  calculated  efficiency of 22.3 percent overall. This 144-half-cell  module  is  to  be  available  in  six  versions  with outputs between 545 and 570 watts and with an efficiency between 21.3 and 22.3 percent.   

Within the following table you can find a summary of the most important data: 

 HiKu7 CS7N-MS 
Dimension 2256mm x 1133mm x 35mm 
Weight 32,3 kg 
Efficiency between 21,3 an 22,3 percent 
Open circuit voltage between 50,85 and 51,60 volts 
Short circuit current ranges from 13,46 to 13,81 amps 
Maximum system voltage 1500 volts 
Mono-crystalline half cell count   144 
Protection class IP68 
Operating temperatures Use at between -40 and +85 degrees Celsius 
Operating temperature coefficient 0.31 percent per degree Celsius 
Performance guarantee 30 years 
Product warranty 12 years 
Power loss after 30 years not less than 87.40 percent of nominal output powe 
Other specifications features two-millimeter thick  coated  tempered glass and anodized aluminum alloyframe 
Productfeatures HiKu7 CS7N-MS 

Longi has hereby produced a module based on the company’s proprietary high-performance  computing technology. The Chinese PV  manufacturer  promises  us  here  to  have produced  a  module which has,  

  • a better temperature coefficient,  
  • better performance at low irradiance,  
  • a lower operating temperature and  
  • better performance in light-induced degradation (LID) and potential-induced  degradation  (PID). 

Accordingly, we can assume that the energy yield is two to three percent higher than conventional bifacial n-type modules. 

Conclusion  

The solar industry is growing steadily, and  as  we  have  seen,  the  world’s  largest  PV  manufacturer, Longi Solar, is also playing a major role in this industry. Along with products from other numerous photovoltaic manufacturers, the new module and also  the  increased  efficiency  can definitely keep up. We are curious to see what new innovations and improvements in the field  of photovoltaics will come our way in the following months. 

References 

Emiliano Bellini ? PV-Magazin; Longi stellt bifaziales n-type-Topcon-Solarmodul mit 22,3 Prozent Wirkungsgrad vor; 04.06.2021; Longi stellt bifaziales n-type-Topcon-Solarmodul mit 22,3 Prozent Wirkungsgrad vor ? pv magazine Deutschland (pv-magazine.de) 

Emiliano Bellini ? PV-Magazin; Longi erreicht 25,21 Prozent Wirkungsgrad für Topcon-Solarzelle; 02.06.2021; Longi erreicht 25,21 Prozent Wirkungsgrad für Topcon-Solarzelle ? pv magazine Deutschland (pv-magazine.de) 

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