Longi Claims Another Efficiency Record

Longi Claims Another Efficiency Record

LONGi Solar has once again made headlines with its latest achievement in solar cell efficiency. Just weeks after setting a record for crystalline silicon-perovskite tandem cells, LONGi has now claimed another record with its crystalline silicon heterojunction back-contact (HBC) solar cells.

The certification for this new record came from the prestigious Institute for Solar Energy Research Hamelin (ISFH) in Germany. According to the certification, LONGi’s HBC solar cells achieved an impressive efficiency of 27.09%. This means that the cells are highly efficient at converting sunlight into electricity. Next to a lower efficiency solar cell, LONGI’s solar cell will convert more sunlight into electricity.

What are crystalline silicon heterojunction back-contact solar cells?

The term “heterojunction” refers to the junction where two different materials meet. In the case of solar cells, it involves a layer of amorphous silicon placed on top of crystalline silicon. This heterojunction allows for a far more efficient panel.

Moreover, the design of back-contact solar cells is another key factor in their high efficiency. Unlike traditional solar cells, which have metal electrical contacts on the front surface, back-contact cells have all their contacts on the backside. This design eliminates shading caused by metal contacts, allowing the entire front surface to capture sunlight and maximise energy conversion.


In its media release, LONGi explained that the 27.09% efficiency was achieved through an innovative all-laser patterning process. This process overcomes the high cost associated with patterning back-contact cells. Patterning is used to create distinct areas for positive and negative contacts on the backside of the HBC cell. Previously, this patterning process relied on expensive photolithography. However, LONGi’s all-laser approach reduces manufacturing costs while maintaining high efficiency.

Additionally, LONGi highlighted another advantage of its HBC cells: reduced use of indium. By minimising the use of transparent conductive oxide layers, the company claims to use only 20% of the element indium compared to traditional bifacial heterojunction cells. This reduction in indium usage not only helps lower manufacturing costs but also makes the cells more sustainable.

LONGi’s continuous breakthroughs in solar cell efficiency demonstrate the company’s commitment to pushing the boundaries of solar technology. By achieving higher efficiency levels while reducing manufacturing costs, LONGi is making solar energy more accessible and economically viable. These advancements bring us closer to a future where renewable energy plays a central role in meeting our global energy needs.


Q: What are heterojunction solar panels?

A: Heterojunction solar panels, also known as HJT solar panels, are a type of solar panel technology that combines the advantages of both crystalline silicon and thin-film solar cells. They consist of a thin layer of amorphous silicon placed between two layers of crystalline silicon. This design allows for higher efficiency and better performance in low-light conditions compared to traditional solar panels.

Q: What is solar panel efficiency?

A: Solar panel efficiency refers to the ability of a solar panel to convert sunlight into usable electricity. It is measured as a percentage and represents the amount of sunlight that a solar panel can convert into electricity. Higher efficiency means that a solar panel can generate more electricity from the same amount of sunlight.

Q: How is solar panel efficiency calculated?

A: Solar panel efficiency is calculated by dividing the power output of the solar panel by the amount of sunlight it receives. The power output is measured in watts (W), and the sunlight input is measured in watts per square meter (W/m²). The efficiency is then expressed as a percentage.

Q: What is the size to power ratio in solar panel efficiency?

A: The size to power ratio in solar panel efficiency refers to the relationship between the physical size of a solar panel and the amount of power it can generate. A higher size to power ratio means that a solar panel can produce more power for its size, indicating higher efficiency. This is an important factor to consider when choosing solar panels, as it determines the amount of space required for installation and the potential power output.

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