Low-resistance thin laser battery and preparation method thereof

The invention discloses a low-resistance thin laser cell and a preparation method thereof, and relates to the field of photovoltaic cells, the low-resistance thin laser cell comprises a flexible substrate, an epitaxial layer structure, an electrode and an antireflection film which are arranged in sequence, and the epitaxial layer structure comprises at least one sub-cell structure; each sub-cell structure comprises a back surface field, a base region, an emitter region and a window layer which are sequentially arranged in the direction away from the flexible substrate; when the epitaxial layer structure comprises a plurality of sub-cell structures, the plurality of sub-cell structures are arranged in sequence, and the plurality of sub-cell structures are conducted through tunnel junctions; one sub-cell structure close to the flexible substrate is a bottom cell; a Bragg reflector is arranged between the flexible substrate and the bottom cell. The material has the advantages of higher photoelectric conversion e