LONGi Sets a New World Record of 27.09% for the Efficiency of Silicon Heterojunction Back-Contact (HBC) Solar Cells


LONGi, the world-leading solar technology company, has set a new world record of 27.09% for the efficiency of crystalline silicon Heterojunction Back Contact (HBC) solar cells, certified by the Institute for Solar Energy Research Hamelin (ISFH) in Germany. The HBC cell was developed independently by LONGi using an all-laser patterning process. This is a new world record for monocrystalline silicon solar cells breaking LONGi’s own 26.81% efficiency record from November 2022.

All-Laser Patterning Process Solves High Patterning Cost Problem 

To reduce the problem of high patterning costs for back-contact cells, LONGi’s R&D team has abandoned the costly photolithography process, and successfully developed an all-laser patterning process. This was used for the new record cell with an efficiency of 27.09%.

Further Cost Reduction Through Reduced Indium Usage 

Another advantage of HBC cells over bifacial heterojunction solar cells is the reduced usage of indium tin oxide layers (ITO). Through continuous technological improvements, LONGi has developed an ultra-thin transparent conductive oxide (TCO) layer with reduced indium usage. The indium usage of the record cell is only 1/5 of that of traditional bifacial heterojunction solar cells, resulting in further cost savings.

“Innovation is the core competitiveness of enterprises and LONGi is committed to 'making the best of solar energy to build a green world'. We at LONGi believe that photovoltaics will play a crucial role in the worldwide energy transition,” said Zhenguo Li, Founder and President of LONGi. Li highlighted the company's continuous pursuit of high-quality products and high-efficiency solar cell technology. 


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