Solar cell and preparation method thereof

The embodiment of the invention provides a solar cell and a preparation method thereof, and relates to the field of solar cells. The solar cell comprises a crystalline silicon layer, a first intrinsic amorphous silicon layer, an N-type doped layer, a first transparent conductive layer and a first metal electrode are sequentially stacked on the front face of the crystalline silicon layer from inside to outside, and a second intrinsic amorphous silicon layer, a P-type doped layer, a second transparent conductive layer and a second metal electrode are sequentially stacked on the back face of the crystalline silicon layer from inside to outside. The second transparent conductive layer comprises a transparent conductive oxide bottom layer, a metal film layer and a transparent conductive oxide outer layer which are sequentially stacked from inside to outside, and the work function of the transparent conductive oxide bottom layer is larger than that of the transparent conductive oxide outer layer. The carrier concen