During the cell production process, the thermal diffusion process often affects many factors in the performance of TOPCon solar cells, resulting in changes in cell performance. In order to scientifically evaluate the impact of the thermal diffusion process on the performance of TOPCon solar cells and understand whether the sheet resistance/resistivity after diffusion meets industrial standards, scientific testing must be carried out with sophisticated testing instruments. Millennial Solar has produced the Built-in Four-Point Probe Tester, which can be placed in the production line in conjunction with production, and can achieve scientific measurement and zero fragmentation rate during the battery testing process, thus helping photovoltaic cell manufacturers produce high-quality quality TOPCon solar cells!

Thermal Diffusion and Its Impact on TOPCon Performance Factors

Thermal diffusion process is an important step in the preparation process of TOPCon solar cells. It is mainly used to form a doped area on the surface of the silicon wafer to achieve the formation of P-N junction and selective collection of carriers. There are two main types of thermal diffusion processes: substitutional diffusion and interstitial diffusion. Substitutional diffusion means that impurity atoms replace the positions of silicon atoms to form a doped region; interstitial diffusion means that impurity atoms fill the gaps in the silicon lattice to form a doped region.

After performing the thermal diffusion process on TOPCon solar cells, photovoltaic cell manufacturers usually use testing equipment to scientifically test the TOPCon solar cells to understand the resistivity/sheet resistance and other performance parameters of the cells after thermal diffusion. For this purpose, Millennial Solar produces Built-in Four-Point Probe Tester. This equipment can be perfectly connected to the industrial production process, and can ensure zero fragmentation rate