Light emitting element, display device including the same, and manufacturing method of light emitting element
A light emitting element includes a first semiconductor layer; an emission layer disposed on the first semiconductor layer; a second semiconductor layer disposed on the emission layer; an electrode layer disposed on the second semiconductor layer; and an insulating film surrounding side surfaces of the first semiconductor layer, the emission layer, and the second semiconductor layer and surrounding a portion of the electrode layer at an end portion of the light emitting element on which the electrode layer is disposed. The electrode layer includes a first surface adjacent to the second semiconductor layer; a second surface facing the first surface and having a width less than a width of the first surface; and a side surface that connects the first surface and the second surface and has a slope in a range of about 75° to about 90° with respect to the first surface of the electrode layer.
1. A light emitting element comprising:
a first semiconductor layer;
an emission layer disposed on the first semiconductor layer;
a second semiconductor layer disposed on the emission layer;
an electrode layer disposed on the second semiconductor layer; and
an insulating film surrounding side surfaces of the first semiconductor layer, the emission layer, and the second semiconductor layer and surrounding a portion of the electrode layer at an end portion of the light emitting element on which the electrode layer is disposed,
the electrode layer includes:
a first surface adjacent to the second semiconductor layer;
a second surface facing the first surface and having a width less than a width of the first surface; and
a side surface that connects the first surface and the second surface has an angle in a range of about 75° to less than 90° with respect to the first surface of the electrode layer.
2. The light emitting element of claim 1 , wherein the insulating film completely surrounds the side surfaces of the emission layer and the second semiconductor layer.
3. The light emitting element of claim 1 , wherein the first surface of the electrode layer directly electrically contacts the second semiconductor layer.
4. The light emitting element of claim 3 , wherein
the insulating film surrounds a portion of the side surface of the electrode layer disposed around the first surface of the electrode layer, and exposes the second surface of the electrode layer and a remaining portion of the side surface of the electrode layer.
5. The light emitting element of claim 1 , wherein the insulating film does not cover a lower surface of the first semiconductor layer.
6. The light emitting element of claim 1 , wherein the insulating film has a uniform thickness at the end portion of the light emitting element.
7. The light emitting element of claim 1 , wherein the insulating film has a surface profile corresponding to a shape of each side surface of the first semiconductor layer, the emission layer, and the second semiconductor layer in a portion surrounding the first semiconductor layer, the emission layer, and the second semiconductor layer.
8. The light emitting element of claim 1 , wherein the insulating film has a surface profile corresponding to a shape of the side surface of the electrode layer at the end portion of the light emitting element.
9. The light emitting element of claim 1 , wherein the insulating film has a thickness that is gradually changed at the end portion of the light emitting element.
10. The light emitting element of claim 9 , wherein the insulating film has a thickness that increases as approaching the emission layer at the end portion of the light emitting element.
11. The light emitting element of claim 1 , wherein
the first semiconductor layer includes a first portion adjacent to the emission layer and a second portion excluding the first portion, and
a width of the first portion is greater than a width of the second portion.
12. The light emitting element of claim 11 , wherein a thickness of a portion surrounding the second portion of the first semiconductor layer is greater than a thickness of a portion surrounding the first portion of the first semiconductor layer in the insulating film.
13. The light emitting element of claim 1 , wherein the insulating film has a thickness of about 10 nm or more at a portion corresponding to the first surface of the electrode layer.
14. The light emitting element of claim 13 , wherein
the electrode layer has a thickness in a range of about 100 nm to about 200 nm, and
the electrode layer is comprised of at least one of chromium (Cr), titanium (Ti), aluminum (Al), gold (Au), nickel (Ni), or copper (Cu), and an oxide thereof, alloy thereof, an indium tin oxide (ITO), an indium zinc oxide (IZO), an indium tin zinc oxide (ITZO), a zinc oxide (ZnO), and an indium oxide (In 2 O 3 ).
15. The light emitting element of claim 1 , wherein
the insulating film surrounds a portion of the side surface of the electrode layer, and
the insulating film exposes another portion of the side surface of the electrode layer.