What does hit battery mean?

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what does HIT battery mean? hit (hetero junction with intrinsic thin layer)

hit is a solar cell in Chinese and hetero junction with intrinsic thin layer in foreign languages, that is, a silicon solar cell with hit structure, with an open circuit voltage of 729mV.

silicon solar cells with HIT structure, the so-called HIT structure is to deposit a layer of undoped (intrinsic) hydrogenated amorphous silicon film and a layer of doped hydrogenated amorphous silicon film opposite to crystalline silicon. After taking this technological measure, the performance of PN junction is improved. Therefore, the conversion efficiency reaches 23%, the open circuit voltage reaches 729mV, and the whole process can be realized below 2℃.

expanding knowledge

HIT battery, commonly known as heterojunction battery, is called crystalline silicon heterojunction solar cell in Chinese. This technology is to deposit amorphous silicon thin film on crystalline silicon, which integrates the core competitiveness of crystalline silicon battery and thin film battery, and is one of the hot trends of silicon-based solar cells with high conversion efficiency.

compared with the traditional crystalline silicon technology, considering the construction of amorphous silicon thin film, the front and rear surfaces of crystalline silicon substrate of silicon heterojunction solar cells have been passivated well, so that the surface passivation treatment is becoming more and more perfect.

Advantages of heterojunction HIT battery

1. Wide application range: It is widely used in solar panels, urban public transportation, communication equipment, power installation engineering, national defense science and technology, or in different economic fields such as ocean navigation and domestic aviation, HIT battery has played an indispensable role.

2. High efficiency improvement potential: the N-type silicon wafer used in the HIT battery has a high minority carrier lifetime, and the corresponding structure passivated by amorphous silicon can also achieve a low surface recombination rate, so that the open circuit voltage of the silicon heterojunction solar cell is much higher than that of the traditional monocrystalline silicon solar cell, and its efficiency potential is as high as 2% compared with the current PERC battery using the P-type silicon wafer. 3. The cost is low and the production process is simple and uncomplicated: the HIT battery combines thin films. The HIT process flow is relatively simple, and all production processes can achieve < P > 4. High stability and high efficiency: HIT battery has good illumination stability, and the amorphous silicon film in heterojunction has not found Staebler－Wronski effect, which means that the conversion efficiency of the battery will not decline due to illumination.

5. Positive and negative batteries: HIT battery is a very good positive and negative battery, and there is basically no color difference between the front and back, and the double-sided rate (referring to the ratio of the back efficiency to the front efficiency of the battery) can reach more than 9%, and the extremely high can reach 98%, so the core competitiveness of back power generation is obvious.

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