Light-emitting element, method of manufacturing light-emitting element, and display device including light-emitting element

A method of manufacturing a light-emitting element, the method comprising:

• sequentially providing an undoped semiconductor layer, a first semiconductor layer, an active layer, a second semiconductor layer, a first electrode layer, and a coupling layer on a stack substrate;
• separating the stack substrate from the undoped semiconductor layer;
• separating the undoped semiconductor layer from the first semiconductor layer;
• positioning a second electrode layer on the first semiconductor layer;
• performing a first etching process to remove at least a portion of each of the second electrode layer, the first semiconductor layer, the active layer, and the second semiconductor layer in a direction from the first semiconductor layer toward the second semiconductor layer;
• performing a second etching process to etch a side surface of each of the second electrode layer, the first semiconductor layer, the active layer, and the second semiconductor layer in the direction from the first semiconductor layer toward the second semiconductor layer such that the side surface defined by the first semiconductor layer, the active layer, the second semiconductor layer, and the second electrode layer is perpendicular to a main surface of the first electrode layer;
• and
• separating the coupling layer from the first electrode layer,
• wherein the performing of the first etching process comprises etching the first electrode layer to have a first cross-sectional area, and etching the second electrode layer to have a second cross-sectional area smaller than the first cross-sectional area.

A display device comprising:

• a substrate;
• a light-emitting element comprising a first semiconductor layer comprising a first type semiconductor, a second semiconductor layer comprising a second type semiconductor different from the first type semiconductor, an active layer between one surface of the first semiconductor layer and one surface of the second semiconductor layer, a first electrode layer on another surface of the second semiconductor layer and having a first cross-sectional area, and a second electrode layer arranged on another surface of the first semiconductor layer and having a second cross-sectional area;
• a first contact electrode on the substrate and electrically connected to the second electrode layer of the light-emitting element;
• and
• a second contact electrode on the substrate and electrically connected to the first electrode layer of the light-emitting element,
• wherein the first contact electrode is between the substrate and the second contact electrode, and
• wherein the second electrode layer is between the substrate and the first electrode layer.