Application of Picosecond Laser in Solar Cell Glass Coding
Release time:2023.06.19
QR codes are widely used in industrial manufacturing due to their ability to store larger amounts of data, as well as in the production process of solar modules. By using laser marking, unique QR codes with specific coding rules are implanted during the production process, ensuring that each process and raw material usage is traceable, thus achieving effective supervision and tracking of quality control. Moreover, the use of laser marking can avoid the pain points of traditional labeling, coding, and other methods, solving the problem of low efficiency in traditional marking methods. Moreover, the marking material of laser marking is permanent, and for solar cells that have been exposed to wind, rain and sun for a long time, it does not fall off or fade, achieving accurate data collection at any time.

But marking glass substrates is not easy, the main reason is the hard brittleness of glass and its high light transmittance. Industrial picosecond lasers with high stability and critical cold working features can be used for multi-channel laser marking applications in solar cells.

There is no doubt that the high stability of lasers is important, especially for 7 * 24 operations on the assembly line, which require mechanical continuity and stable output to ensure consistency in label size and resolution, and to help improve production capacity.
For the features of hard brittleness, the pulse width of picosecond lasers is very narrow, only about 10ps. Such a narrow pulse width makes it impossible for the laser energy to accumulate a pulse on the material surface before it ends. As a result, the heat affected zone of the processing is very small. With an ultra narrow pulse width and an output power higher than 30W, it is easy to obtain very high peak power. When applied to the glass surface, laser photons directly damage the bonds of the target material, which is relatively a "cold" processing process. The entire process is very clean, conducive to dust control, and without mechanical stress, further improving the quality of product labeling.

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