Solar cell back field laser pn isolation process
A solar cell and back field technology, applied in circuits, electrical components, sustainable manufacturing/processing, etc., can solve problems such as loss of power generation area, reduction of photoelectric conversion efficiency of solar cells, surface pollution of solar cells, etc., and achieve reduction of minority carrier recombination centers , Improve photoelectric conversion efficiency and product qualification rate, reduce the effect of blue-black point aberration film
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the following description is only for explaining the present invention and not limiting its content.
[0022] Such as image 3 As shown, the present invention is a solar cell back field laser PN isolation process, including steps: pre-cleaning texturing, diffusion, PN isolation, post-cleaning, plasma enhanced chemical vapor deposition (PECVD) deposition of silicon nitride, silk screen Printing and sintering, test sorting; the PN isolation adopts laser etching, the specific method is: on the back of the solar cell, use a fiber laser to perform edge grooves around the back surface of the silicon wafer at a rate of 100mm / s. The distance between the groove and the edge of the silicon wafer is 0.5 mm, and the depth of the groove is 10-15 μm, so as to realize PN isolation. The fiber laser has a wavelength of 1064nm and a frequency of 10...
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