Situation
Fingers and bus bars that later conduct electricity are applied to solar cells during the metallization process. Checking the quality of the metal grid on a solar cell identifies more than just defective solar cells. The grid’s condition provides information about the cause of defect. GP PRINT-Q .Cam carefully checks print quality in solar cells. The GP PRINT-Q FS .Cam system for checking the solar cell’s front face ensures solid process monitoring, while one
GP PRINT-Q RS .Cam for each printing step does the same for the cell's back face.
Principle
- Optical inspection system
- Stop measurement
Advantages
- Immediate feedback in case of process changes
- Central recipe management and “copy-exact” process
- Simple and fast calibration option
- Constant calibration control
Technical Data
Topic |
Description |
Samples to be measured |
- Mono- and multicrystalline solar cells - Square or pseudo square - Textured or untextured |
Wafer size |
100 … 156 mm |
Measured features |
Print positions, print defects, finger widths, edge lengths, rectangularity, diagonals, phase lengths and angle, chipping, V-breaks, intrusion length and depth, surface defects |
Minimum cycle time |
1 s |
Machine interface (automation) |
- Parallel I/O - Parallel I/O (combined with RS232 for WaferID info) - Profibus |
Data interface (to factory |
XML via TCP/IP |
GP PRINT-Q FS .Cam |
Front side print inspection |
Camera model |
4M / Matrix |
Minimum defect size |
80 µm / 60 µm / 40 µm |
Stand Still time |
180 ms / 180 ms / 180 ms |
GP PRINT-Q RS .Cam |
Back side print inspection |
Camera model |
1M / Matrix |
Minimum defect size |
160 µm / 80 µm |
Stand Still time |
25 ms / 25 ms |
Note: All technical details are subject to change without prior notice. Only technical specifications contained in an offer are binding.
User Interface
GP PRINT-Q .Cam checks print quality on the front and back sides of solar cells. A flexible classification option with the copy exact function also makes it possible to ensure a global quality standard independent of individual production facilities. Furthermore, the automated calibration control (ACC) option monitors the calibration status of the measuring system in every measurement cycle.
