Display panel, fabrication method thereof, and display device

A fabrication method of a display panel, comprising:

• providing a substrate;
• forming a pixel defining layer on the substrate, the pixel defining layer comprising a plurality of openings and a bank enclosing each opening, the bank comprising a notch;
• and
• forming a first electrode at a bottom of each opening of the plurality of openings, the first electrode extending into the notch, wherein a height of the first electrode is less than or equal to a maximum height of the notch with respect to a plane where the substrate is located,
• wherein the bank comprises a top face, a bottom face, and at least one side face connecting the top face with the bottom face;
• the top face has an area greater than an area of the bottom face;
• and the at least one side face comprises the notch,
• wherein the at least one side face comprises a plurality of steps, and a distance from a top wall of the notch to a surface of the substrate is gradually decreased along a direction facing towards the substrate,
• wherein the forming the pixel defining layer on the substrate comprises:
• forming a first portion of the bank on the substrate, the first portion of the bank being close to the substrate;
• forming a sacrificial layer on the substrate, wherein the sacrificial layer is located near the first portion of the bank and is in contact with the first portion;
• forming a second portion of the bank on both the sacrificial layer and the first portion of the bank, the second portion of the bank being away from the substrate, the notch being a gap between the bank and the substrate;
• and
• removing the sacrificial layer.