1results about How to "Reduce laser power" patented technology

The application relates to the technical field of solar cells, and particularly discloses a solar cell and a preparation method thereof. The solar cell comprises a silicon substrate, the silicon substrate comprises a front surface and a back surface, the front surface comprises a first laser contact area, a second laser contact area and a third laser contact area, the first laser contact area and the third laser contact area are alternately and spacedly arranged on the front surface of the silicon substrate; the second laser contact area and the first laser contact area are overlapped in a vertical direction, the width of the second laser contact area is smaller than that of the first laser contact area, the front surface further comprises a front surface metal electrode, the front surface metal electrode is in contact with the second laser contact area, and the crystallization rate of the second laser contact area is higher than that of a non-overlapping area in the first laser contact area. The solar cell has the advantages that the contact resistance of the metal grid line is reduced through gradient crystallization treatment, filling gain is brought, and the photoelectric conversion efficiency of the solar cell is further improved.