Electrode of full-back-contact solar cell and fabrication method of electrode

Abstract

The invention belongs to the field of solar cells, and provides an electrode of a full-back-contact solar cell and a fabrication method of the electrode. The electrode is characterized in that the electrode comprises first fine grid metal electrodes, second fine grid metal electrodes, first main grid electrodes, second main grid electrodes and first dielectric layers, wherein the first fine grid metal electrodes, the second fine grid metal electrodes, the first main grid electrodes and the second main grid electrodes are positioned on a first main surface of a substrate; the first fine grid metal electrodes and the second fine grid metal electrodes are alternately distributed in an inter-digital shape; the first main grid electrodes and the second main grid electrodes are intersected with the first fine grid metal electrodes and the second fine grid metal electrodes respectively; intersected and overlapped parts between the first main grid electrodes and the second fine grid metal electrodes are isolated from intersected and overlapped parts between second first main grid electrodes and the first fine grid metal electrodes by the dielectric layers; and the first main grid electrodes and the first fine grid metal electrodes are directly contacted with the second main grid electrodes and the second fine grid metal electrodes in intersected and overlapped positions. Compared with the prior art, according to the electrode and the fabrication method, an influence of electrical shading of the electrode is eliminated; line resistance losses of the electrode are reduced; and the performance of a device is improved.

Description

Technical field: [0001] The invention relates to a full-back contact solar cell electrode and a manufacturing method thereof, belonging to the field of solar cells. technical background: [0002] In order to reduce the cost of photovoltaic power generation, it is necessary to continuously improve the conversion efficiency of solar cells. The full back contact solar cell has the following advantages: 1) Using n-type monocrystalline silicon with high bulk life as the substrate material can obtain higher open circuit voltage; Without electrode shielding, higher short-circuit current can be obtained; 3) There is no need to consider the light-receiving surface shielding, and the electrode width can be wider, so that the series resistance can be reduced and a higher fill factor can be obtained. Based on the above advantages, the full back contact solar cell is considered to be a highly efficient solar cell structure with great potential. [0003] The electrodes of the full back ...

AI Technical Summary

Problems solved by technology

Third, the long fine grid metal electrode 11 and the fine grid metal electrode 2 12 are prone to broken grids during the manufacturing process, and they only have one end connected to the corresponding main grid metal electrode. The current collected by the electrode of the broken grid part will not be directly collected by the main grid metal electrode

However, due to the increase in the number of main gate electrodes, the resistance loss caused by the electrical shading of the main gate electrodes and the lateral transmission of the region-carrying carriers in the semiconductor substrate will be more obvious.

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