What’s trending?Following the brief overview of HJT technology’s current status, Ding discussed multiple topics that are trending in the industry.The transition from using HJT wafers produced by the rechargeable CZ (RCZ) process to the continuous CZ (CCZ) process offers several advantages, particularly as polysilicon is fed during the ingot-pulling process. However, a drawback of CCZ technology is the slightly higher oxygen content within the wafer, which does not negatively affect the HJT cell due to the low-temperature fabrication process. Additionally, the use of CCZ technology with fluidized bed reactor (FBR)-produced granular polysilicon provides a more cost-effective wafer solution, although with a slightly lower purity level.Dark degradation refers to the degradation of HJT cells after being kept in the dark for a period, such as between cell production and module assembly. While this issue can be reversed through light soaking of the module, it incurs additional costs. The institute emphasized that some observations suggest that if one shifts from amorphous silicon to nano-crystallized silicon oxide, the dark degradation seems to be stronger, while some reports suggest that using N2O as an oxygen source for the nanocrystalline silicon growth instead of CO2 controls dark degradation issue quite well.The transition to 0BB metallization typically involves Meyer Berger's Smart Wire Connection Technology (SWCT), which utilizes wires coated with a low-temperature solder-coated alloy, embedded in adhesive polymer foil. The foil is aligned to the cell, and a subsequent low-temperature lamination process creates contact with the cell's fingers. However, some systems, such as MAXWELL and XN Automation, use integrated equipment (IFC) to lay down wires and adhesive foils directly onto the cells.The efficiency levels of HJT modules can be summarized as follows: up to 26.81% for the SHJ M6 cell, up to 27.30% for the HBC M6 cell, and 24.99% for the SHJ module, among others.
