What is hjt battery?

　　1. In today's life, solar energy products can be seen everywhere. People use solar energy and solar water heaters to cook. Solar energy products are everywhere. Of course, the most important is solar power generation, but the current technology can not make full use of solar power generation. In recent years, the essence of rapid development of photovoltaic industry chain is technology driven cost reduction and efficiency improvement. At present, the trend of single crystal has been established. The progress of efficiency improvement of p-type battery is slowing down, and the potential of efficiency improvement of n-type battery is huge. Looking into the future, we believe that the most anticipated change in the photovoltaic industry is that the battery chain will change from p-type battery to n-type battery. Among them, heterojunction battery, with its high efficiency and huge cost reduction potential, has become the next wave of the photovoltaic industry. Core advantage: high efficiency! The fundamental reason lies in the large band gap of heterostructure.

　　2. The conversion efficiency of solar cells can be expressed as the product of open circuit voltage, short circuit current and filling factor. The open circuit voltage depends on the strength of the built-in electric field, and finally on the band gap of the battery material itself. The band gap of heterojunction battery is 1.7-1.9 ev, which is much higher than 1.12 eV of crystalline silicon homogeneous battery. Therefore, the heterojunction battery has high open circuit voltage and high battery efficiency. Process: The core process is completely different from perc. The four core processes of heterojunction battery are cleaning and flocking, amorphous silicon film deposition, conductive film deposition, printing electrode and sintering.

　　3. The difference with perc process is:

　　(1) In the amorphous silicon film deposition process, PECVD or RPD was used to deposit the intrinsic hydrogenated amorphous silicon layer and p-type n-type hydrogenated amorphous silicon layer;

　　(2) PVD is used to deposit TCO conductive film in the coating process;

　　(3) The printing electrode is made of low-temperature silver paste;

　　(4) Low temperature sintering should be controlled during sintering. Cost: Equipment and consumables have great potential to reduce costs in the future. At present, the cost of heterojunction battery mainly comes from silicon (47%), slurry (24%), depreciation (6%) and target (5%).

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