BC new product, a new photovoltaic era has arrived?

LONGi Green Energy, the world's leading solar technology company, released a new record of crystalline silicon cell efficiency and a new generation of ultra-high-value module product Hi-MO in Madrid, Spain, on the afternoon of May 7th local time (early morning of May 8th, Beijing time). 9. Li Zhenguo, founder and president of LONGi Green Energy, She Haifeng, vice president of LONGi, Dr. Xu Xixiang, chief scientist of LONGi and deputy director of Academia Sinica, and more than 200 global customer representatives and media reporters witnessed this grand moment.

At the press conference, LONGi announced to the world the new BC technology efficiency record just set by its R&D team. Different from the two technologies of TOPCon and HJT, BC battery has all metal contacts on the back of the battery, so it is called "Back Contact". The effect of this technological innovation is to eliminate the front metal electrode structure, achieving higher photoelectric conversion efficiency and a better appearance experience.

Certified by the Institute of Solar Energy in Hamelin (ISFH), Germany, the photoelectric conversion efficiency of the back-contact crystalline silicon heterojunction solar cell (HBC) independently developed by LONGi reached 27.30%, once again breaking the world record for monocrystalline silicon photovoltaic cell conversion efficiency.

The difference between BC technology and TOPCon and HJT technology routes is that it is not a single technology, but a platform technology that can be combined with PERC, HJT, TOPCon and other technologies to form multiple technology routes such as HPBC, HBC and TBC. Longi Green Energy, which has entered the BC track, adopts HPBC technology, which is a new generation of high-efficiency battery technology with composite passivation back contact and no grid lines on the front of the battery. Huanghe Hydropower focuses on IBC batteries, which use cross-back contact to transfer all the electrode grid lines on the front of the battery to the back of the battery, thereby achieving higher conversion efficiency by reducing the blocking of sunlight by the front grid lines. The ABC technology independently developed by Aixu is a new battery structure technology developed on the BC battery structure based on N-type substrate silicon wafer technology.

Since N-type back contact technology is much more difficult than P-type back contact technology, the industry is not optimistic about the large-scale mass production of N-type BC technology.

Nowadays, with the remarkable results achieved in N-type BC mass production technology, BC technology will also become a hot technology route in the industry.

In the next few years, BC-type cells will be increasingly favored by the photovoltaic industry due to their high conversion efficiency and product value. More leading companies will quickly transition to BC-type cells, and BC-type cells will become crystalline silicon cells. absolutely mainstream.