SEMICONDUCTOR LIGHT-EMITTING DEVICE

• US 20140209955A1
• Filed: 12/31/2013
• Published: 07/31/2014
• Est. Priority Date: 01/29/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Seung-Hwan, KIM, TAE-HUN
• Granted Patent: US 9,391,238 B2
• Time in Patent Office: Days
• US Class Current: 257/99
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 2933/0016 relating to electrodes
• CPC Class Codes: H01L 33/20 with a particular shape, e.g. curved or truncated substrate
• CPC Class Codes: H01L 33/22 Roughened surfaces, e.g. at the interface between epitaxial layers
• CPC Class Codes: H01L 33/38 with a particular shape
• CPC Class Codes: H01L 33/44 characterised by the coatings, e.g. passivation layer or anti-reflective coating
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls

Abstract

A semiconductor light-emitting device includes a light-emitting structure that includes a first conductive semiconductor layer, an active layer, a second conductive semiconductor layer, an electrode layer contacting one of the first conductive semiconductor layer and the second conductive semiconductor layer, and a bonding conductive layer connected to the electrode layer. The bonding conductive layer includes a main bonding layer having a recess area defined by a stepped portion on a surface opposite to a surface facing the electrode layer, and a filling bonding layer filling at least a part of the recess area.

Claims

1. A semiconductor light-emitting device comprising:

a light-emitting structure comprising a first conductive semiconductor layer, an active layer, and a second conductive semiconductor layer;

an electrode layer contacting one of the first conductive semiconductor layer and the second conductive semiconductor layer; and

a bonding conductive layer connected to the electrode layer,

wherein the bonding conductive layer comprises;

a main bonding layer having a recess area defined by a stepped portion on a surface opposite to a surface facing the electrode layer; and

a filling bonding layer filling at least a part of the recess area.

2. The semiconductor light-emitting device of claim 1, wherein the main bonding layer and the filling bonding layer comprise different materials from each other.

3. The semiconductor light-emitting device of claim 1, wherein the main bonding layer and the filling bonding layer have substantially flat surfaces that extend on a same plane as each other and are opposite to surfaces facing the electrode layer.

4. The semiconductor light-emitting device of claim 1, further comprising a conductive barrier layer disposed between the main bonding layer and the filling bonding layer in the recess area.

5. The semiconductor light-emitting device of claim 1, wherein each of the main bonding layer and the filling bonding layer comprise a material selected from the group consisting of gold (Au), tin (Sn), nickel (Ni), lead (Pb), silver (Ag), indium (In), chromium (Cr), germanium (Ge), silicon (Si), titanium (Ti), tungsten (W), platinum (Pt), or a combination thereof.

6. The semiconductor light-emitting device of claim 1, wherein the main bonding layer comprises a material selected from the group consisting of gold (Au), tin (Sn), nickel (Ni), lead (Pb), silver (Ag), indium (In), chromium (Cr), germanium (Ge), silicon (Si), titanium (Ti), tungsten (W), platinum (Pt), or a combination thereof, and the filling bonding layer is formed of a conductive polymer.

7. The semiconductor light-emitting device of claim 1, further comprising a filling insulating layer covering a part of the bonding conductive layer on a same level as the bonding conductive layer.

8. The semiconductor light-emitting device of claim 7, wherein the filling insulating layer comprises an insulating layer that contacts and insulates the bonding conductive layer, and a metal layer that fills a recess in the insulating layer defined by a stepped portion of the insulating layer under the recess.

9. A semiconductor light-emitting device comprising:

a package substrate;

a first conductive semiconductor layer comprising grooves disposed in a surface facing the package substrate such that a plurality of mesa areas having a plurality of branching portions spaced apart from one another are defined;

an active layer disposed on the plurality of mesa areas;

a second conductive semiconductor layer disposed on the active layer;

a first electrode layer connected to the second conductive semiconductor layer, on the plurality of mesa areas;

a second electrode layer connected to the first conductive semiconductor layer, on bottom surfaces of the grooves; and

a bonding conductive layer disposed between the package substrate and at least one of the first electrode layer and the second electrode layer,

wherein the bonding conductive layer comprises;

a main bonding layer having a contact surface contacting the at least one electrode layer, a mount surface opposite to the contact surface, and at least one recess area defined by stepped portions in the mount surface; and

a filling bonding layer filling the at least one recess area.

10. The semiconductor light-emitting device of claim 9,

wherein the second electrode layer comprises a plurality of contact areas contacting the main bonding layer.

11. The semiconductor light-emitting device of claim 10, wherein the at least one recess area comprises a plurality of recess areas disposed to correspond to the plurality of contact areas of the second electrode layer,

wherein the filling bonding layer is formed in each of a plurality of spaces defined by the package substrate and the plurality of recess areas.

12. The semiconductor light-emitting device of claim 9, wherein the main bonding layer comprises a first portion covering a part of the first electrode layer with an insulating layer therebetween, and a second portion contacting the second electrode layer and covering the second electrode layer, and

wherein the filling bonding layer is disposed vertically overlapping with the second electrode layer.

13. The semiconductor light-emitting device of claim 9, wherein the package substrate comprises a first conductive layer and a second conductive layer spaced apart from each other,

wherein each of the main bonding layer and the filling bonding layer contacts at least one of the first conductive layer and the second conductive layer.

14. The semiconductor light-emitting device of claim 9, further comprising a conductive barrier layer disposed between the main bonding layer and the filling bonding layer in the at least one recess area,

wherein the conductive barrier layer comprises a portion contacting the package substrate.

15. The semiconductor light-emitting device of claim 9, wherein the main bonding layer comprises an alloy of nickel (Ni) and tin (Sn), and the filling bonding layer comprises an alloy of gold (Au) and Sn.

16. The semiconductor light-emitting device of claim 9, further comprising a filling insulating layer that contacts the package substrate around the bonding conductive layer.

17. The semiconductor light-emitting device of claim 9, wherein the first conductive semiconductor layer includes an uneven surface facing away from the package substrate.

18. A semiconductor light-emitting device comprising:

a substrate having an uneven pattern disposed on a first surface thereof;

a first conductive semiconductor layer disposed on the uneven pattern on the first surface of the substrate, wherein the first conductive semiconductor layer comprises a plurality of grooves therein, a first mesa area that constitutes part of a first mesa structure, and a plurality of second mesa areas constituting a plurality of second mesa structures branching from the first mesa structure and wherein the second mesa areas have a plurality of branching portions which are spaced apart from one another by the grooves disposed therebetween;

an active layer disposed on the first mesa area and the second mesa areas;

a second conductive semiconductor layer disposed on the active layer;

a first electrode layer connected to the second conductive semiconductor layer and overlapping with first mesa area and the second mesa areas;

a second electrode layer extending in a longitudinal direction of the grooves on bottom surfaces of the grooves, wherein the second electrode layer includes a plurality of contacts disposed on the bottom surfaces of the grooves which connect the second electrode layer to the first conductive semiconductor layer;

a first insulating layer covering sidewalls of the first mesa structure and the second mesa structures branching from the first mesa structure;

a second insulating layer covering the sidewalls of the first mesa structure and the second mesa structures branching from the first mesa structure with the first insulating layer therebetween and covering a non-contact area of the first electrode layer;

a first bonding conductive layer disposed on the first electrode layer and overlapping with the first mesa structure and connected to the first electrode layer via a contact area of the first electrode layer, wherein the first bonding conductive layer includes a first main bonding layer having a first recess area therein defined by a stepped portion in a surface opposite to a contact surface of the first main bonding layer contacting the first electrode layer, and a first filling bonding layer filling in the first recess area of the first main bonding layer; and

a second bonding conductive layer disposed on the second electrode layer and connected to the second electrode layer through the plurality of contacts of the second electrode layer, wherein the second bonding conductive layer includes a second main bonding layer having a plurality of second recess areas disposed in a surface opposite to a surface facing the second electrode layer and defined by a stepped portion of the second mesa structures, and a plurality of second filling bond layers filling the second recess areas.

19. The semiconductor light-emitting device of claim 18, wherein the first main bonding layer and the second main bonding layer each comprise a material selected from the group consisting of gold (Au), tin (Sn), nickel (Ni), lead (Pb), silver (Ag), indium (In), chromium (Cr), germanium (Ge), silicon (Si), titanium (Ti), tungsten (W), platinum (Pt), or a combination thereof, and wherein the filling bonding layer is formed of a conductive polymer selected from the group consisting of polyacetylene, polyaniline, polypyrrole, polythiophene, poly sulfur nitride, poly(2- or 3-alkylthiophene), polyphenylene, polyphenylene sulfide, polyisothiannaphthene, polyazulene, polyfuran, poly(phenylenevinylene), poly(thienylene-vinylene) or a combination thereof.

20. The semiconductor light-emitting device of claim 18, wherein the second bonding conductive layer contacts the contact areas of the second electrode layer and the second insulating layer over the second mesa structures, and wherein the second bonding conductive layer overlaps with the second mesa structures.