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HJT Solar Cells are the most efficient and durable commercial solar technology. Efficiency can exceed 23% and useful lifespan reaches 30 years

CUTTING EDGE: HJT Solar Cell

HJT SOLAR CELL MANUFACTURING COMING TO THE USA 

Heterojunction solar technology (HJT) is a type of solar cell technology that combines the advantages of both traditional crystalline silicon solar cells and thin-film solar cells. HJT solar cells use a thin layer of amorphous silicon on top of a crystalline silicon wafer to create a heterojunction, which helps to reduce the energy loss caused by the recombination of charge carriers at the interface between different materials. technology has a high-efficiency rate, reaching 26%, and can produce more energy with less material than traditional solar cell technologies.

In comparison to other solar technologies, HJT has several advantages. For example, it has higher conversion efficiency than traditional crystalline silicon solar cells, which means that it can produce more power per unit area. HJT also has a lower temperature coefficient than traditional solar cells, which means that it can maintain higher efficiency at higher temperatures. Additionally, HJT solar cells have a longer lifespan and are more resistant to degradation than other thin-film solar cell technologies.

 

However, HJT technology is currently more expensive to produce than traditional crystalline silicon solar cells, and the manufacturing process is more complex. HJT solar cells also require more precise manufacturing techniques, which can make them more difficult to produce at scale. Despite these challenges, HJT solar technology is expected to become more cost-competitive as production processes become more streamlined and economies of scale are achieved

CONTINUOUS IMPROVEMENT OF HJT TECHNOLOGY

REVKOR's brand, REVSUN™, actively promotes the efficiency improvement and cost reduction of heterojunction technology through research and development. We are actively researching and developing HJT-specific wafers, cells, and modules using single-sided micro-crystalline, double-sided microcrystalline, HBC, copper electroplating, and heterojunction-perovskite tandem cells. While continuously lifting cell efficiency, REVSUN has taken various measures to reduce HJT cost, such as thinning wafers, reducing silver paste consumption, increasing screen lifetime, optimizing the cleaning process, improving target utilization, and a range of other beneficial features. Some examples include:

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  • REVSUN will introduce a 130mm wafer into mass production in the Phase ll factory and is planning to achieve a wafer thickness of 125mm in Q4 2023. The wafer thickness is expected to drop to 100mm in the next couple of years.

  • REVSUN will adopt silver-coated copper on the sub-grid on the cells backslide in 2023 Q4. Combined with metal screen technology, the silver consumption of a single chip is estimated to drop to 100mg.

  • REVSUN is planning to fully apply silver-coated copper paste combined with busbar-free technology in 2023 so that the silver consumption of a single piece can be reduced to 70 mg.

  • In 2024, REVSUNthrough the application of copper plating technology, the silver-containing paste will be completely replaced, and the silver consumption per watt will be reduced to 0mg.

  • REVSUN aims to achieve 800W module power output and 29.6 cell efficiency by 2025 through the superposition of heterojunction and perovskite.

MODULE ELEVATION

HJT SOLAR CELLS achieves Irradiance uniformity on the backside of the module not only does it affect the irradiance on the backside, but the module height also affects the reflected light uniformity. If the module height is low, the amount of irradiance on the backside is different on certain parts of the module due to its own shadow.

 

The cells near the top edge of the module absorb more light than the cells on the rest of the module. When the module elevation is at 5cm, the range of irradiance exposed to the backside of the module is rather larger; the highest measurement is 5 times higher than the lowest value recorded. As module elevation increases, the irradiance values are more uniform throughout the module. This is important because irradiance uniformity results in mismatch loss from the module and array, which ultimately leads to energy loss. 

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