Double-faced solar cell and preparation method thereof

Abstract

The invention discloses a double-faced solar cell. The double-faced solar cell comprises a P-type substrate layer, a first doping layer, a first passivation layer, a first electrode, a second doping layer, a second doping layer, a second passivation layer and a second electrode, wherein the first doping layer is positioned on the first surface of the P-type substrate layer; the first doping layercomprises a first heavily doped region and a first lightly doped region surrounding the outer edge of the first heavily doped region; the first passivation layer is positioned on the upper surface ofthe first doping layer; the first electrode is positioned on the upper surface of the first passivation layer, and the first electrode is in contact with the first heavily doped region; the second doping layer is positioned on the second surface of the P-type substrate layer, and the second doping layer comprises a second heavily doped region and a second lightly doped region; the second passivation layer is positioned on the lower surface of the second doping layer; the second electrode is positioned on the lower surface of the second passivation layer; and the first surface is opposite to the second surface. According to the double-faced solar cell disclosed by the invention, the first surface and the second surface of the cell adopt selective emitting electrode technology respectively,so that the photovoltaic conversion efficiency is further promoted. Moreover, the invention provides a preparation method with the advantages.

Description

technical field [0001] The present application relates to the technical field of solar cells, in particular to a double-sided solar cell and a preparation method thereof. Background technique [0002] With the development of society, energy consumption has increased sharply, and the energy crisis has become the focus of attention of all countries in the world. In order to alleviate the energy crisis, making full use of renewable energy is an effective measure. Solar energy is a green and environmentally friendly renewable energy with unlimited reserves and no waste water, waste residue and other pollutants. Therefore, the photovoltaic industry has developed rapidly in recent years. [0003] Improving the photoelectric conversion efficiency of solar cells has always been the goal pursued by the photovoltaic industry. In recent years, by improving the quality of silicon wafers and the performance of paste, the photoelectric conversion efficiency of solar cells has been great...

AI Technical Summary

Problems solved by technology

[0004] PERT battery (Passivated Emitter and Rear Totally-diffused cell, Passivated Emitter and Rear Totally-diffused cell), is a typical double-sided solar cell, by using selective emitter technology on the back of the cell to make the photoelectric conversion of the cell Efficiency is improved, but the degree of improvement in photoelectric conversion efficiency is limited

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