Solar cell and photovoltaic module

A photovoltaic module, comprising:

• one or more cell strings formed by connecting a plurality of solar cells;
• one or more encapsulation layers configured to cover at least one surface of the one or more cell strings;
• and
• one or more cover plates configured to cover at least one surface of the one or more encapsulation layers away from the one or more cell strings;
• wherein each solar cell of the plurality of the solar cells includes a thin-film solar cell and a bottom cell stacked in a first direction, wherein the bottom cell has a stacked structure in the first direction including:
• a transparent conductive layer, a first doped conductive layer, an intrinsic amorphous silicon layer, a substrate, a selective passivation layer, and one or more electrodes, wherein the transparent conductive layer is between the thin-film solar cell and the first doped conductive layer;
• wherein the selective passivation layer covers a portion of a surface of the substrate away from the intrinsic amorphous silicon layer and includes a plurality of passivation contact structures arranged at intervals in a second direction, wherein each passivation contact structure of the plurality of passivation contact structures includes a tunneling layer and a second doped conductive layer stacked in the first direction;
• wherein the one or more electrodes are formed on a surface of the selective passivation layer away from the substrate, at least one electrode of the one or more electrodes is in ohmic contact with the second doped conductive layer of a respective passivation contact structure of the plurality of passivation contact structures;
• wherein the first doped conductive layer includes a doped amorphous silicon layer or a doped microcrystalline silicon layer;
• and
• wherein a ratio of an area of an orthographic projection of the selective passivation layer on the substrate in the first direction to an area of the surface of the substrate away from the intrinsic amorphous silicon layer is in the range of 1% to 10%.