Forum on Solar Cell Paste and Metallization -Lithium - Ion Battery Equipment

Forum on Solar Cell Paste and Metallization Technology -Lithium - Ion Battery Equipment

Metallization is a key step in the production of crystalline silicon solar cells. Metallized electrodes are prepared on the front and back of silicon wafers by means of screen printing and sintering of conductive paste, so as to lead photogenerated carriers out of the cells. Slurry is the key material of metallization process, accounting for 50-60% of the non silicon cost of battery chips. The paste consists of conductive phase, adhesive and organic carrier, including silver paste on the front, silver paste on the back and aluminum paste on the back, which has an important impact on the photoelectric conversion efficiency and cost of the battery.

In 2018, the new installed capacity of global photovoltaic exceeded 100GW, bringing a huge market of 10 billion for conductive paste industry. At the same time, due to the continuous demand for efficiency improvement and the pressure of cost reduction, the technology of crystalline silicon solar cells and modules is rapidly updated and iterated, which constantly puts forward higher requirements for the metallization process and conductive paste. The improvement of the localization rate of positive silver is conducive to reducing the cost of paste for battery enterprises. Chinese enterprises are constantly introducing new conductive paste for high-efficiency solar cells.(Lithium - Ion Battery Equipment)

PERC battery requires that the slurry has a wide sintering process window and can match the laser SE process; The back silver of PERC shall not burn through the back passivation layer and have good tensile performance, and shall be well matched with the aluminum paste of PERC. The double-sided PERC battery requires to increase the height width ratio of aluminum grid and reduce the resistance while reducing the amount of aluminum paste. The burn through aluminum paste technology can eliminate the laser drilling step of the back passivation film and reduce the battery cost.

In 2018, Tongwei, Aikang, Rainbow and other enterprises will build new capacity of heterojunction batteries. Heterojunction batteries need low temperature silver paste, which should be in good contact with TCO layer, quickly solidified to shorten the process time, improve the tension to meet the needs of MBB, and can be stored at room temperature. In addition to silver paste metallization, Meyerberg introduced SmartWire smart grid connection technology for heterojunction batteries, which uses copper wire metallization; Meco also introduced electroplating metallization technology that can improve battery efficiency.

N-type double-sided battery urgently needs to reduce silver paste consumption to control cost. Passivation contact technology can greatly improve the conversion efficiency of N-type battery, which is an important development direction of N-type battery. The metallization process and conductive paste suitable for N-type passivation contact battery are attracting attention in the industry. Black silicon technology is becoming the standard configuration of polycrystalline batteries. The special nanostructures on the surface of black silicon batteries require positive silver with high tension and can balance the contact resistance and open circuit voltage.

The fifth solar cell slurry and metallization technology forum will be held in Changzhou on March 21, 2019. The conference will discuss the prospects of the global and Chinese photovoltaic industry and the slurry market, the new high efficiency solar cell technology and the corresponding metallization process and conductive paste, the research on the conductive mechanism and contact mechanism of sintered silver paste and low-temperature silver paste, the localization and cost reduction path of positive silver paste, the technological progress and investment opportunities of silver paste and aluminum paste, and the production, supply and demand of key raw materials of photovoltaic paste.



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