Thus, low-damage cell cutting in combination with high-throughput Al 2 O 3 layer deposition for edge passivation is a very promising approach to maintain high efficiency for industrial TOPCon solar cells in shingled modules. Edge passivation by passivated edge technology (PET) boosts efficiency of cutted solar cells. 1. Introduction
As for thermal stress cleaving, different solar cells have different requirements. For the mc-Si solar cells, the thermal stress cleaving needs scribing throughout the separation path on the cell back surface, and the scribing depth needs to be more than 40% of the cell thickness, which is the same as that for the mechanical cleaving.
The laser scribing process In the laser scribing process, reducing the laser ablation damage to the solar cells is the main concern, especially for heterojunction technology (HJT) solar cells made at a low temperature (≤300 °C) .
It is proved that combining this new scribing method with the thermal stress cleaving is an economical separation solution with less laser scribing loss and better compatibility for different cells. Our results would shed some light on future separating and module design efforts of solar cells. 1. Introduction
The investigated TOPCon shingle solar cells feature a cell size of 26.46 mm × 158.75 mm. They are separated from industrial full-square TOPCon host cells either by conventional laser scribing and mechanical cleaving (LSMC) from the emitter-free rear side or by thermal laser separation (TLS) from the front side.
However, in mass production, there is still lack of a low scribing loss and broad compatible cell separation method. In this work, a systematic investigation was conducted on the crystalline silicon solar cell separation processes, including the laser scribing and the cleaving process.