Heterojunction solar cell and preparation method thereof

The invention relates to a heterojunction solar cell and a preparation method thereof. The preparation method of the heterojunction solar cell comprises the following steps of performing texturing treatment on two surfaces of a silicon wafer, and then sequentially preparing an intrinsic layer, a doped layer and a transparent conductive layer on the textured surface; a plurality of silicon oxide units distributed at intervals are prepared on the surface, away from the doping layer, of the transparent conducting layer, and the refractive index of the silicon oxide units is between the refractive index of air and the refractive index of the transparent conducting layer; preparing grid line electrodes between adjacent silicon oxide units; and sequentially carrying out curing and light injection treatment to obtain the heterojunction solar cell. The preparation method is low in raw material cost, simple in process and easy to implement, and the heterojunction solar cell obtained by the preparation method has high