Solar cell, preparation method thereof and photovoltaic module

Abstract

The invention provides a solar cell and a preparation method thereof, and a photovoltaic module, and the method comprises the following steps: carrying out the doping of the front surface of a textured N-type semiconductor substrate, so as to form a P-type emitter; forming a tunneling layer on the rear surface of the semiconductor substrate; depositing and forming a first polycrystalline silicon layer, an N-type doped amorphous silicon layer and a second polycrystalline silicon layer on the surface of the tunneling layer; carrying out annealing treatment , so that doping elements in the N-type doped amorphous silicon layer are diffused to the first polycrystalline silicon layer and the second polycrystalline silicon layer, and a composite N-type doped polycrystalline silicon layer is formed; forming a first passivation layer on the surface of the P-type emitter; and forming a second passivation layer on the surface of the composite N-type doped polycrystalline silicon layer. According to the solar cell provided by the invention, the loss of parasitic optical absorption and free carrier absorption on the rear surface of the solar cell can be reduced, and the passivation performance is improved.

Description

technical field [0001] The present application relates to the field of photovoltaic technology, in particular, to a solar cell, a preparation method thereof, and a photovoltaic module. Background technique [0002] TOPCon (Tunnel Oxide Passivated Contact) batteries rely on the "tunneling effect" to achieve rear surface passivation. The rear surface structure of existing TOPCon batteries is a semiconductor substrate, a tunneling layer, and doped conductive materials from the inside to the outside. layer, rear surface passivation layer. The current polysilicon doped layer on the back of the N-type TOPCon cell absorbs light severely, which makes the passivation effect poor, resulting in a decrease in short-circuit current. Contents of the invention [0003] In view of this, the application proposes a solar cell and its preparation method, and a photovoltaic module. By forming a composite N-type doped polysilicon layer with different doping concentrations on the surface of th...

AI Technical Summary

Problems solved by technology

The current polysilicon doped layer on the back of the N-type TOPCon cell absorbs light severely, which makes the passivation effect poor and leads to a decrease in the short-circuit current

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