Solar multi-junction battery with mismatch structure and manufacturing method thereof

Abstract

The invention discloses a solar multi-junction battery with a mismatch structure and a manufacturing method, the solar multi-junction battery at least comprises a first solar battery pack, a crystalline silicon substrate and a second solar battery pack which are sequentially laminated, wherein the upper surface of the crystalline silicon substrate is provided with a first combination structure, and the lower surface of the crystalline silicon substrate is provided with a second combination structure; each of the first combination structure and the second combination structure comprises a plurality of convex columns arranged at intervals, the upper surface of the crystalline silicon substrate is combined with the first solar battery pack through the first combination structure, the lower surface of the crystalline silicon substrate is combined with the second solar battery pack through the second combination structure, and the top ends of the convex columns are pressed by stress, bending deformation of a certain degree can exist, stress is released, the situation that the crystalline silicon substrate, the first solar cell pack or the second solar cell pack warps due to the stress effect is prevented, defects such as dislocation are reduced, and the battery is stable in structure and has high energy conversion efficiency.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a mismatched solar multi-junction cell and a manufacturing method. Background technique [0002] Among solar cells, III-V compound multi-junction solar cells have high conversion efficiency, but due to the high manufacturing cost of compound multi-junction solar cells, it is difficult to be widely used. [0003] Lamination design is required before the production of solar cells. The lamination design needs to pay attention to obtain high crystal quality epitaxial materials and match the current of each sub-cell. Designing lattice-mismatched solar cells can break the traditional lattice-matched solar cells Due to the constraints on material selection, the range of material selection has been broadened. In the design process, it is only necessary to focus on designing the semiconductor material components of each sub-cell so that the bandgap meets the current matching requireme...

AI Technical Summary

Problems solved by technology

[0002] In solar cells, III-V compound multi-junction solar cells have high conversion efficiency, but due to the high production cost of compound multi-junction solar cells, it is difficult to be widely used

[0003] Lamination design is required before the production of solar cells. The lamination design needs to pay attention to obtain high crystal quality epitaxial materials and match the current of each sub-cell. Designing lattice-mismatched solar cells can break the traditional lattice-matched solar cells Due to the constraints on material selection, the range of material selection has been broadened. In the design process, it is only necessary to focus on designing the semiconductor material components of each sub-cell so that the bandgap meets the current matching requirements. However, designing a solar cell with a lattice mismatch will There are problems such as deterioration of material quality due to defects such as dislocations, warping of epitaxial parts, etc.

[0004] At present, the method to reduce the stress and defects caused by lattice mismatch is mainly to grow a lattice graded buffer layer between two lattice mismatched materials, but the lattice graded buffer layer generally needs to grow to a certain thickness to be effective. To achieve the effect, its thickness accounts for about 1 / 6 to 1 / 3 of the thickness of the entire epitaxial layer, which is not conducive to cost control and productivity improvement

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