MWT solar cell and method of making the same

Abstract

The invention provides a manufacturing method of a MWT (Metal Wrap Through) solar battery. The method comprises the steps of: providing a substrate which comprises a body layer, a reflection-reducing layer and a passivation layer, wherein a plurality of through holes and openings are arranged on the substrate; forming conductive electrodes in the through holes and forming a first back contact electrode on the back of the substrate; forming second back contact electrodes in the openings; forming a touch grid line electrode on the front face of the substrate; sintering the substrate so that the touch grid line electrode is electrically connected with the conductive electrode; and forming a local front surface field in the front surface of the body layer; and forming a local back emitting electrode in the back surface of the substrate. The MWT solar battery manufactured by the method is small in composite current, large in light receiving area and high in photoelectric conversion efficiency, and the problem that the battery is bended is reduced. In addition, according to the manufacturing method provided by the invention, steps such as diffusive knot manufacture, edge corrosion, glass layer removal and secondary clean in conventional process are avoided, so that the manufacturing process flow is simplified and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a MWT solar cell and a manufacturing method thereof. Background technique [0002] A solar cell, also known as a photovoltaic cell, is a semiconductor device that converts the sun's light energy directly into electrical energy. Because it is a green product, does not cause environmental pollution, and uses renewable resources, solar cells are a new energy source with broad development prospects in today's energy shortage situation. [0003] One of the most important criteria to measure the electrical performance of a solar cell is its photoelectric conversion efficiency. The higher the photoelectric conversion efficiency of a solar cell, the stronger its ability to convert light energy into electrical energy. [0004] The structure of conventional N-type crystalline silicon solar cells, such as figure 1 As shown, from the front to the back of the battery, there are front el...

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Problems solved by technology

[0005] However, in practical applications, it is found that the photoelectric conversion efficiency of conventional N-type solar cells is low

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