Light emitting diode having vertical topology and method of making the same
DCFirst Claim
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1. A light emitting device, comprising:
- a supporting layer;
a first electrode on the supporting layer, the first electrode including an ohmic electrode and a reflective electrode;
a second electrode on the first electrode;
a semiconductor structure comprising a first surface and a second surface opposite the first surface, the semiconductor structure arranged between the first electrode and the second electrode, wherein the first electrode, relative to the second electrode, is proximate to and aligned with the first surface, and the second electrode, relative to the first electrode, is proximate to and aligned with the second surface;
a light-extraction structure that is part of the second surface of the semiconductor structure; and
a passivation layer disposed on at least one surface of the semiconductor structure,wherein the first electrode comprises a surface facing the first surface of the semiconductor structure,wherein the area of the surface of the first electrode and the area of the first surface of the semiconductor structure are different, and wherein the thickness of the reflective electrode is in the range of 300 Å
to 5000 Å
.
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Abstract
An LED having vertical topology and a method of making the same is capable of improving a luminous efficiency and reliability, and is also capable of achieving mass productivity. The method includes forming a semiconductor layer on a substrate; forming a first electrode on the semiconductor layer; forming a supporting layer on the first electrode; generating an acoustic stress wave at the interface between the substrate and semiconductor layer, thereby separating the substrate from the semiconductor layer; and forming a second electrode on the semiconductor layer exposed by the separation of the substrate.
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Citations
29 Claims
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1. A light emitting device, comprising:
- a supporting layer;
a first electrode on the supporting layer, the first electrode including an ohmic electrode and a reflective electrode; a second electrode on the first electrode; a semiconductor structure comprising a first surface and a second surface opposite the first surface, the semiconductor structure arranged between the first electrode and the second electrode, wherein the first electrode, relative to the second electrode, is proximate to and aligned with the first surface, and the second electrode, relative to the first electrode, is proximate to and aligned with the second surface; a light-extraction structure that is part of the second surface of the semiconductor structure; and a passivation layer disposed on at least one surface of the semiconductor structure, wherein the first electrode comprises a surface facing the first surface of the semiconductor structure, wherein the area of the surface of the first electrode and the area of the first surface of the semiconductor structure are different, and wherein the thickness of the reflective electrode is in the range of 300 Å
to 5000 Å
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 22, 23, 24)
- a supporting layer;
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17. A light emitting device, comprising:
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a supporting layer; a connection metal layer on the supporting layer; a first electrode on at least one portion of the connection metal layer;
a second electrode;a semiconductor structure having multi-layers, the semiconductor structure positioned between the first electrode and the second electrode, the semiconductor structure having a first surface and a second surface opposite the first surface, wherein the first electrode, compared to the second electrode, is proximate to the first surface, the second electrode, compared to the first electrode, is proximate to the second surface, and at least a portion of the second surface is configured as a light-extraction structure; and a passivation layer on the semiconductor structure, wherein the semiconductor structure includes a substantially un-doped semiconductor layer proximate to the second surface. - View Dependent Claims (18, 19, 25, 26, 27)
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20. A light emitting device, comprising:
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a supporting layer comprising at least one of semiconductor and metal; a connection metal layer on the supporting layer; a first electrode on at least one portion of the connection metal layer; a semiconductor structure having multi-layers on the first electrode; a light-extraction structure formed on at least a portion of the semiconductor structure; a second electrode on the semiconductor structure; and a passivation layer on the semiconductor structure, wherein the light-extraction structure comprises a photonic crystal that includes randomly positioned unit structures, and wherein the light-extraction structure reflects a photonic crystal having periodically positioned unit structures, wherein the distance between the periodically positioned unit structures substantially equals the average distance between the randomly positioned unit structures. - View Dependent Claims (21, 28, 29)
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Specification