Preparation method for solar cell with integrated diode

Abstract

The invention relates to the field of a solar cell, and mainly discloses a preparation method for a solar cell with an integrated diode. The preparation method for the solar cell with the integrated diode mainly comprises the following steps of epitaxial growth on a P-type Ge substrate, first photoetching, second photoetching, preparation of an edge protection layer and evaporation of an electrode layer. The preparation method has the advantages that operation is convenient and the quality of a grown sub battery is favorable through a mode of preparing the sub battery by epitaxial growth; two regions of a bypass diode and an isolation groove can be accurately formed by the first photoetching and the second photoetching; the electric leakage of a positive-negative (PN) junction in the bypass diode is avoided by preparing the edge protection layer, and the quality of the PN junction is optimized; and finally, the more uniform electrode layer is prepared by a method of thermal evaporation, the internal resistance is reduced, and the energy loss is reduced. In summary, the preparation method is simple to operate, and moreover, the solar cell provided with the integrated diode of which the positive voltage is reduced and the starting voltage is small can be prepared according to the method.

Description

technical field [0001] The invention relates to the field of solar cell preparation, in particular to a method for preparing a solar cell with integrated diodes. Background technique [0002] As clean energy is more and more favored by people, the development speed of solar cells as the first choice for clean energy is also getting faster and faster. Due to the failure of single cells in the working process of solar cells, the solar cells will be damaged due to the hot plate effect of the solar panels of the battery array. In order to prevent this phenomenon, a bypass diode is usually connected in parallel between the positive and negative poles of the single battery, so that it can act as a shunt, thereby avoiding the problematic single battery. [0003] In the preparation process of the bypass diode solar cell, since the integrated bypass diode solar cell can simplify the manufacturing process, the demand for the combination of the solar cell and the bypass diode will bec...

AI Technical Summary

Problems solved by technology

However, the traditional integrated bypass diodes are designed with a multi-node structure, which makes the bypass diodes have the disadvantages of high turn-on voltage and large series resistance.

In addition, the traditional integrated bypass diode does not protect its edge junction, so it will cause edge reverse leakage. The main reason is that the traditional preparation process is unreasonable.

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