Back-contact solar cell and preparation method

Abstract

The invention provides a back-contact solar cell and a preparation method. The back-contact solar cell comprises a silicon wafer substrate. The back side of the silicon wafer substrate is provided with an N+ first conductive area and a P+ second conductive area with an interval. The N+ first conductive area is provided with a first electrode, and the P+ second conductive area is provided with a second electrode. An isolation area is arranged between the N+ first conductive area and the P+ second conductive area. The top surfaces of the first electrode and the second electrode are on the same horizontal plane, and the top surface of the isolation area is higher than that of the first electrode and the second electrode. According to the back-contact solar cell, through arranging the isolation area between the N+ first conductive area and the P+ second conductive area, the electrodes are lower than the isolation area, the problem of electrode offset printing is solved well, the problem of positive electrode and negative electrode short circuit caused by metal slurry offset is solved, and the stability of the cell is improved greatly.

Description

technical field [0001] The invention relates to the technical field of solar energy applications, in particular to a back contact solar cell and a preparation method thereof, in particular to an IBC solar cell. Background technique [0002] Conventional fossil fuels are being exhausted day by day. Among the existing sustainable energy sources, solar energy is undoubtedly the cleanest, most common and most potential alternative energy source. 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 is a renewable resource, solar cells are a new energy source with broad development prospects in today's energy shortage situation. [0003] There are many kinds of solar cells, among which, IBC (Interdigitated backcontact, interdigitated back contact) solar cells are favored by more and more people in the industry becau...

AI Technical Summary

Problems solved by technology

[0005] However, the IBC solar cell with the above-mentioned structure has the following problems: due to the short distance between the positive electrode and the negative electrode, the accuracy of the screen-printed electrode is very high, and the printing deviation of the electrode and the printed metal paste often occur during the actual preparation process. When the material is offset, the positive electrode and the negative electrode are short-circuited, resulting in poor stability of the battery

Images