NEW SOLAR CELL AND FABRICATION METHOD THEREFOR

• Main Authors: LU, Tao, ZHANG, Mingming, JIANG, Hongjie, XU, Mingyan, BAI, Yupan, FU, Shaojian, YU, Yinlong
• Format: Patent
• Language: Chinese; English; French
• Published: 04.04.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; SEMICONDUCTOR DEVICES

The present invention relates to the field of solar cell manufacturing, and particularly relates to a new solar cell and a fabrication method therefor. The method comprises: subjecting the front surface of n-type substrate silicon to boron doping to obtain a boron-doped layer; sequentially disposing a tunnel oxide layer and a polycrystalline silicon layer on the back surface of the n-type substrate silicon; subjecting the surface of the polycrystalline silicon layer to phosphorus diffusion to form a lowly doped n+ polycrystalline silicon layer; subjecting a metal region of the lowly doped n+ polycrystalline silicon layer to laser heavy doping to form an n++ polycrystalline silicon layer located in the metal region, so as to obtain a photovoltaic precursor; removing reaction by-products on the surface of the photovoltaic precursor by means of acid pickling and alkali washing; sequentially disposing an aluminum oxide layer and a front nitride passivation layer on the front surface of the photovoltaic precursor