What is HJT battery?

HJT battery is a heterojunction battery. It is a special PN junction. It is formed of amorphous silicon and crystalline silicon materials. It deposits an amorphous silicon film on crystalline silicon and is a type of N-type battery. Heterojunction cell is a high-efficiency crystalline silicon solar cell structure, a hybrid solar cell made of crystalline silicon substrate and amorphous silicon film, that is, P-type hydrogenated amorphous silicon and N-type hydrogenated amorphous silicon and N A layer of undoped hydrogenated amorphous silicon film is added between the silicon substrates.

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What is an HJT battery?

HJT battery is also called a heterojunction battery. It is a special PN junction formed from amorphous silicon and crystalline silicon materials. An amorphous silicon film deposited on crystalline silicon is a type of N-type battery.

Heterojunction cell is a high-efficiency crystalline silicon solar cell structure, a hybrid solar cell made of crystalline silicon substrate and amorphous silicon film, that is, P-type hydrogenated amorphous silicon and N A layer of non-doped (intrinsic) hydrogenated amorphous silicon film is added between the type hydrogenated amorphous silicon and the N-type silicon substrate.

The full name of heterojunction battery is intrinsic thin film heterojunction battery. It is a new type of battery based on the photovoltaic effect. Due to its unique double-sided symmetrical structure and the excellent passivation effect of the amorphous silicon layer, It has the advantages of high conversion efficiency, high bifacial ratio, almost no light-induced attenuation, good temperature characteristics, the ability to use thin silicon wafers, and the ability to stack perovskite. At the same time, its manufacturing process is short, and it will be more popular in the future.

After the application of heterojunction cell technology in the photovoltaic field, the conversion efficiency of photovoltaic cells has increased from 22.3% to 24%. That is, the annual power generation of a power station with the same floor area has increased by approximately 7.6%. %. At the same time, heterojunction technology not only has excellent conversion efficiency, but also has relatively simple production process steps.

HJT batteries and HIT batteries are the same, both are called "photovoltaic heterojunction cells".

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HIT (Heterojunction with Intrinsic Thinfilm) battery was first successfully developed by Japan's Sanyo Company in 1990. Since HIT has been registered as a trademark by Sanyo, it is also Known as HJT, HDT, or SHJ.

#The laboratory efficiency of HIT batteries reaches more than 26%, and the average mass production efficiency of existing mainstream manufacturers reaches 23%. In terms of efficiency, it is indeed a step higher than PERC batteries. HJT battery process flow is simple. Currently, PERC, the mainstream battery technology on the market, requires 8-10 processes, while HJT technology has only four processes, namely cleaning and texturing, amorphous silicon film deposition, TCO film preparation and screen printing. Among them, cleaning, texturing and screen printing are both traditional silicon crystal battery processes. HJT's unique process is based on amorphous silicon film deposition and TCO film deposition.

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