Solar Panel Roof Mounting Systems
What are the characteristics and advantages of solar panel heterojunction cells?

HJT heterojunction cells subvert the traditional cell structure and have the advantages of high conversion efficiency, simple manufacturing process, thin silicon wafer application, low temperature coefficient, no light-induced attenuation and potential attenuation, and double-sided power generation. There is an advantage in conversion efficiency that significantly exceeds that of PERC. The output efficiency of PERC is 10% lower than that of heterojunction, which means that with the same power index, the heterojunction will generate 10% more electricity than PERC in the whole power generation cycle.

Features and Benefits of Heterojunction Cells (HJT Cells)

1. No PID phenomenon: Since the upper surface of the battery is TCO, the charge will not generate polarization on the TCO on the battery surface, and there is no PID phenomenon. At the same time, the experimental data also confirmed this. Technical Application and Prospect of Heterojunction Solar Cells

2. Low temperature manufacturing process: The processing temperature of all processes of HJT battery is lower than 250, which avoids the process of high temperature diffusion junction formation with low production efficiency and high cost, and the low temperature process makes the optical band gap, deposition rate, The absorption coefficient and hydrogen content are more precisely controlled, and adverse effects such as thermal stress caused by high temperature can also be avoided.

3. High efficiency: HJT batteries have been setting the world record for mass-produced battery conversion efficiency. The efficiency of HJT cells is 1-2% higher than that of P-type monocrystalline cells, and the difference is slowly increasing.

4. Technical application and prospect of heterojunction solar cells with high light stability: The Staebler-Wronski effect, which is common in amorphous silicon solar cells, does not appear in HJT solar cells. At the same time, the N-type silicon wafer used in the HJT cell, the dopant is phosphorus, and there is almost no light-induced attenuation phenomenon.

5. It can be developed towards thinning: the process temperature of HJT batteries is low, the upper and lower surface structures are symmetrical, and there is no mechanical stress, so thinning can be achieved smoothly; in addition, research has shown that for N-type batteries with high minority carrier lifetime (SRV<100cm/s) Silicon substrate, the thinner the wafer, the higher the open circuit voltage can be.

Although the technology of heterojunction solar cells is so good, it has not been widely used in the market.

The power of a photovoltaic module is equal to the product of the effective cell area, solar radiation intensity and cell efficiency in the module. Therefore, replacing PERC cells with heterojunction cells in the future will create higher-power modules, thereby bringing lower cost per watt and cost per kilowatt-hour for power investors.

The latest components of Bluesun are HJT products, including 700w shingled solar panel, 670w solar panel, 550w half-cell solar panel.

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