# US 2014/0191191 A1 · Light Emitting Devices with Textured Active Layer

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- Number: US 2014/0191191 A1
- Document ID: US20140191191A1
- Status: Published application
- Kind: A1
- Application number: 14/210,522
- Filed: 2014-03-14
- Published: 2014-07-10
- Earliest claimed: 2010-03-09
- Assignees: TSMC Solid State Lighting Ltd.
- Applicants: TSMC Solid State Lighting Ltd.
- Inventors: Hsin-Chieh Huang
- Web page: https://patentgrep.com/patent/US20140191191A1

## CPC

- H10H 20/82: Roughened surfaces, e.g. at the interface between epitaxial layers
- H10H 20/811: having quantum effect structures or superlattices, e.g. tunnel junctions
- H10H 20/821: of the light-emitting regions, e.g. non-planar junctions
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS

## Abstract

A device includes a textured substrate having a trench extending from a top surface of the textured substrate into the textured substrate, wherein the trench comprises a sidewall and a bottom. A light-emitting device (LED) includes an active layer over the textured substrate. The active layer has a first portion parallel to the sidewall of the trench and a second portion parallel to the bottom of the trench.

## Claims

### Claim 1

A lighting apparatus, comprising:
a substrate that includes a textured surface; and
a light-emitting diode (LED) structure disposed over the textured surface of the substrate;
wherein:
the LED structure includes a first recesses and a second recess; and
the first recess and the second recesses are shaped differently.

### Claim 2 (depends on 1)

The lighting apparatus of claim 1, wherein the first recess and the second recess have different lateral dimensions.

### Claim 3 (depends on 1)

The lighting apparatus of claim 1, wherein the first recess and the second recess have different slant angles.

### Claim 4 (depends on 1)

The lighting apparatus of claim 1, wherein at least one of the first recess and the second recess is shaped as a rectangle in a top view.

### Claim 5 (depends on 1)

The lighting apparatus of claim 1, wherein at least one of the first recess and the second recess is shaped as an elongate strip in a top view.

### Claim 6 (depends on 1)

The lighting apparatus of claim 1, wherein the first recess is encircled by the second recess in a top view.

### Claim 7 (depends on 1)

The lighting apparatus of claim 1, wherein:
the textured surface of the substrate includes a third recess and a fourth recess;
the first recess is shaped substantially similar to the third recess; and
the second recess is shaped substantially similar to the fourth recess.

### Claim 8 (depends on 1)

The lighting apparatus of claim 1, wherein the LED structure is disposed conformally over the textured surface of the substrate.

### Claim 9 (depends on 1)

The lighting apparatus of claim 1, wherein the LED structure includes a first cladding layer, a second cladding layer, and a multiple quantum well (MQW) layer disposed between the first and second cladding layers;
and further comprising:
a first electrode disposed on the first cladding layer; and
a second electrode disposed on the second cladding layer.

### Claim 10

A lighting apparatus, comprising:
a substrate that includes a first recess and a second recess, the first recess and second recess having different geometries;
a light-emitting diode (LED) structure disposed over the substrate, the LED structure including a first cladding layer, a second cladding layer, and a multiple quantum well (MQW) layer disposed between the first and second cladding layers;
a first electrode electrically coupled to the first cladding layer; and
a second electrode electrically coupled to the second cladding layer. wherein:
the LED structure includes a third recess disposed over the first recess and a fourth recess disposed over the second recess;
the first recess and the third recess having substantially similar geometries; and
the second recess and the fourth recess having substantially similar geometries.

### Claim 11 (depends on 10)

The lighting apparatus of claim 10, wherein the first recess and the second recess have different lateral dimensions.

### Claim 12 (depends on 10)

The lighting apparatus of claim 10, wherein the first recess and the second recess have different slant angles.

### Claim 13 (depends on 10)

The lighting apparatus of claim 10, wherein at least one of the first recess and the second recess is shaped as a rectangle in a top view.

### Claim 14 (depends on 10)

The lighting apparatus of claim 10, wherein at least one of the first recess and the second recess is shaped as an elongate strip in a top view.

### Claim 15 (depends on 10)

The lighting apparatus of claim 10, wherein the first recess is encircled by the second recess in a top view.

### Claim 16 (depends on 10)

The lighting apparatus of claim 10, wherein the LED structure is disposed conformally over the substrate.

### Claim 17

A lighting apparatus, comprising:
a substrate that includes an upper surface that includes a plurality of trenches, wherein at least some of the trenches have different geometric characteristics than other trenches; and
a light-emitting diode (LED) structure disposed conformally over the upper surface of the substrate.

### Claim 18 (depends on 17)

The lighting apparatus of claim 17, wherein the geometric characteristics include lateral dimension, slant angle, or spacing between neighboring trenches.

### Claim 19 (depends on 17)

The lighting apparatus of claim 17, wherein at least one of the trenches is shaped as a rectangle or as an elongate strip in a top view.

### Claim 20 (depends on 17)

The lighting apparatus of claim 17, wherein the trenches include a first trench and a second trench being encircled by the first trench in a top view.