The invention discloses a
heterojunction cell and a photovoltaic module, and the
heterojunction cell comprises a
silicon wafer, and an intrinsic layer, a
doping layer and a transparent conductive layer which are sequentially laminated on the front surface or the back surface of the
silicon wafer, and also comprises a
dielectric layer laminated on the transparent conductive layer and an
electrode in contact with the transparent conductive layer, the first
electrode part extends into the
dielectric layer along the thickness direction of the
silicon wafer and is in contact with the transparent conductive layer, the second
electrode part is positioned on the first electrode part and extends to the surface of the
dielectric layer, and the maximum width of the second electrode part is greater than that of the first electrode part. According to the invention, the patterned
dielectric layer is formed on the transparent conductive layer, so that a finer grid line design can be realized, and the
cell efficiency and the module power are improved; meanwhile, the patterned
dielectric layer serves as a
mask for preparing the electrode, expensive photosensitive ink does not need to be adopted, and the process cost is greatly reduced.