On November 2, 2023, the 19th China Solar Grade Silicon and Photovoltaic Power Generation Symposium (19th CSPV) was held in Xi 'an, Winhitech R & D Technology Department representatives were invited to attend, and shared the advanced efficient packaging material solutions of  (HJT&BC&TOPCON) cells in the branch venue of new technology theme. The keynote speeches "Research on Factors Affecting the reliability of HJT module Packaging" and "Industrialization Progress of silicon-based heterojunction solar cells" were published.

Dong Liang, the representative of Winhitech, used a large amount of research data to show the advantages of HJT products. "Research on Factors affecting the reliability of HJT module Packaging" shared the verification test of HJT package reliability problems that we are concerned about.

Test one: UV tolerance

Screening of qualified stable phototransfer film and high cut-off film

Test two: Resistance to water vapor penetration.

The quality of the film is improved( stability of the interlayer structure), laminating process according to film characteristics targeted optimization or butyl adhesive overlay protection

Test three: Adhesive force of the film

Adjusting the formulation of adhesive film, the improved adhesive force is good between layers

Through the joint efforts of colleagues in the industry, the long-term reliability of HJT modules (3 times IEC standards) is currently excellent.

In the keynote speech "Progress in the Industrialization of Silicon-Based Heterostructure Solar Cells", Lian Weifei, representative of Winhitech, shared that Winhitech's HJT technology adopted a number of industry-leading technologies, including the use of 210 half-cut silicon wafers with a thickness of 100μm, microcrystal technology and low silver slurry, etc. With continuous efforts, the mass production efficiency of HJT cells has exceeded 25.8%, the module power has exceeded 730W, and the LCOE of its module has decreased by 10% compared with the PERC modules under the support of high power generation. This will bring lower electricity costs to customers, improve customer installed income to a higher level, and improve performance in various usage scenarios. 

At last, the author introduced the basic situation of Winhitech and its achievements in technological innovation, R&D investment and honors. Invitations were issued to the expert representatives attending the meeting to actively work with colleagues in the industry to improve technology, reduce costs,etc, and then actively strengthen exchanges and cooperation with industry colleagues in heterojunction technology improvement.