Array substrate and manufacturing method thereof

A display panel comprising an array substrate, wherein the array substrate comprises:

• a substrate base;
• a buffer layer disposed on the substrate base;
• a gate electrode metal layer disposed on one side of the buffer layer away from the substrate base;
• a gate insulating layer disposed on one side of the gate electrode metal layer away from the buffer layer;
• an active layer disposed on one side of the gate insulating layer away from the gate electrode metal layer and patterned to form a channel area;
• an interlayer dielectric layer disposed on one side of the active layer away from the gate insulating layer;
• and
• a source/drain electrode layer disposed on the one side of the active layer away from the gate insulating layer and patterned to form a source electrode and a drain electrode;
• wherein the source/drain electrode layer comprises a first source/drain electrode layer and a second source/drain electrode layer, areas where the first source/drain electrode layer is in contact with the active layer form doped areas, the second source/drain electrode layer is disposed on one side of the first source/drain electrode layer away from the substrate base, a material of the first source/drain electrode layer is same as a material of the active layer, and ion doping concentrations of the first source/drain electrode layer and the active layer are different.