Light-emitting diode device geometry

• US 6,847,052 B2
• Filed: 06/17/2003
• Issued: 01/25/2005
• Est. Priority Date: 06/17/2002
• Status: Expired due to Fees

• Current Assignee: Kopin Corporation
• Original Assignee: Kopin Corporation
• Inventors: Fan, John C. C., Choi, Hong K., Oh, Tchang-Hun, Chen, Jyh Chia, Narayan, Jagdish
• Primary Examiner(s): Nhu, David
• Application Number:
  US10/463,219
• Publication Number:
  US 20040077135A1
• Time in Patent Office: 588 Days
• Field of Search: 257/79, 257/13, 257/21, 257/63, 257/19, 257/88, 257/200, 257/201, 257/212, 257/187, 257/288, 257/918
• US Class Current: 257/79
• CPC Class Codes: H01L 21/28575 on semiconductor bodies comprising AIIIBV compounds
• CPC Class Codes: H01L 2933/0016 relating to electrodes
• CPC Class Codes: H01L 33/32 containing nitrogen
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/40 Materials therefor
• CPC Class Codes: Y10S 257/918 Light emitting regenerative switching device, e.g. light emitting scr arrays, circuitry

Abstract

A semiconductor device includes: a substrate; an n-type semiconductor layer over the substrate, the n-type semiconductor layer having a planar top surface; a p-type semiconductor layer extending over a major portion of the n-type semiconductor layer and not extending over an exposed region of the n-type semiconductor layer located adjacent to at least one edge of the planar top surface of the n-type semiconductor layer; a first bonding pad provided on the exposed region of the n-type semiconductor layer; an electrode layer extending over the p-type semiconductor layer; and a second bonding pad on the electrode layer, the bonding pad including a central region for securing an electrical interconnect, and at least one finger-like region protruding from the central region, the finger-like region having a length extending away from the central region and a width that is substantially less than the length. A method for producing a semiconductor device also is described.

Claims

1. A semiconductor device comprising:

a substrate;

an n-type semiconductor layer over the substrate, the n-type semiconductor layer having a planar top surface;

a p-type semiconductor layer extending over a major portion of the n-type semiconductor layer and not extending over an exposed region of the n-type semiconductor layer located adjacent to at least one edge of the planar top surface of the n-type semiconductor layer;

a first bonding pad provided on the exposed region of the n-type semiconductor layer;

an electrode layer extending over the p-type semiconductor layer; and

a second bonding pad on the electrode layer, the bonding pad comprising a central region for securing an electrical interconnect, and at least one finger-like region protruding from the central region, the finger-like region having a length extending away from the central region and a width that is substantially less than the length.

2. The device of claim 1, wherein the second bonding pad covers an area of the electrode layer that approximately corresponds to the geometric center of the top surface of the electrode layer.

3. The device of claim 1, wherein the electrode layer comprises a plurality of edges and the second bonding pad is approximately equidistant from each of the edges.

4. The device of claim 1, wherein adjacent edges of the n-type semiconductor layer meet to form corners, and the first bonding pad is located adjacent to a corner.

5. The device of claim 1, wherein the length dimension of at least one finger-like region extends generally parallel to an edge of the n-type semiconductor layer.

6. The device of claim 1, wherein the second bonding pad includes two finger-like regions extending away from the central region generally perpendicular to one another.

7. The device of claim 1, wherein the first bonding pad includes a central region for securing an electrical interconnect and at least one finger-like region protruding from the central region, the finger-like region having a length extending away from the central region and a width that is substantially less than the length.

8. The device of claim 7, wherein at least one finger-like region of the first bonding pad extends adjacent to an edge of the n-type semiconductor layer.

9. The device of claim 8, wherein a finger-like region of the first bonding pad extends adjacent to more than one edge of the n-type semiconductor layer.

10. The device of claim 8, wherein the first bonding pad comprises two finger-like regions, including a first finger-like region extending adjacent to an edge of the n-type semiconductor layer on one side of the central region, and a second finger-like region extending adjacent to an edge of the n-type semiconductor layer on another side of the central region.

11. The device of claim 8, wherein the at least one finger-like region extends adjacent to no more than about 50 percent of the total outer perimeter of the n-type semiconductor layer.

12. The device of claim 1, wherein at least one of the first and second bonding pads comprises a metallic material.

13. The device of claim 12, wherein the metallic material comprises a layer of palladium, a layer of aluminum over the layer of palladium, and a layer of gold over the layer of aluminum.

14. The device of claim 1, wherein the first bonding pad and the second bonding pad are comprised of a substantially identical material.

15. The device of claim 1, wherein at least one of the n-type semiconductor layer and the p-type semiconductor layer comprises a GaN-based semiconductor material.

16. The device of claim 1, additionally comprising an active region between the n-type semiconductor layer and the p-type semiconductor layer, the active region extending over a major portion of the n-type semiconductor layer and not extending over an exposed region of the n-type semiconductor layer located adjacent to at least one edge of the planar top surface of the n-type semiconductor layer.

17. The device of claim 1, wherein the active region comprises a single or multiple quantum well structure.