Solar cell and preparation method thereof

Abstract

The embodiment of the invention relates to the technical field of solar cells, and discloses a solar cell and a preparation method thereof. According to the invention, the solar cell comprises a substrate, a positive electrode, a negative electrode and a charged passivation layer, the substrate comprises a front surface and a back surface which are oppositely arranged, the back surface of the substrate is provided with P-type doped layers and N-type doped layers which are alternately arranged, the P-type doped layers are connected with the positive electrode, and the N-type doped layers are connected with the negative electrode; the charged passivation layer is located on one side of the front surface, the charged density of the charged passivation layer ranges from 1013 coulomb / cm <2> to1016 coulomb / cm <2>, and the thickness of the charged passivation layer ranges from 10 nanometers to 30 nanometers. According to the solar cell and the preparation method thereof provided by the invention, the preparation process of the solar cell can be simplified and the production cost can be reduced on the premise of ensuring the carrier transport capability.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of solar cells, in particular to solar cells and their preparation methods. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. For conventional solar cells, the p+ doped region contact electrodes and the n+ doped region contact electrodes are respectively located on the front and back sides of the battery sheet. The front of the battery is the light-receiving surface, and the coverage of the metal contact electrodes on the front will inevitably cause a part of the incident sunlight to be blocked and reflected by the metal electrodes, resulting in a part of optical loss. The coverage area of ​​the front metal electrode of an ordinary crystalline silicon solar cell is about 7%, and reducing t...

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Problems solved by technology

[0004] The inventors have found that there are at least the following problems in the prior art: high-temperature thermal diffusion is used on the front surface of the substrate to form a front field or a floating emission level, cleaning is required after high-temperature diffusion, the preparation process of solar cells is complicated, and the production cost higher

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