Semiconductor light emitting device having roughness layer
First Claim
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1. A semiconductor light emitting device, comprising:
- a substrate;
a first conductive semiconductor layer on the substrate;
an active layer on the first conductive semiconductor layer;
a second conductive semiconductor layer on the active layer, the second conductive semiconductor layer including a top surface and a bottom surface opposing to the top surface, the bottom surface being adjacent to the active layer;
a roughness layer disposed on the second conductive semiconductor layer and including Al material;
a conductive layer including Ti material on the roughness layer; and
at least one of a first AlGaN based semiconductor layer disposed on the active layer and a second AlGaN based semiconductor layer disposed under the active layer,wherein the first conductive semiconductor layer includes a first GaN layer and the second conductive semiconductor layer includes a second GaN layer,wherein the second conductive semiconductor layer includes a plurality of apexes on the top surface, the distance between at least two apexes of the plurality of apexes is about 0.3 μ
m to about 1.0 μ
m,wherein the conductive layer includes a lower surface having a shape corresponding to the top surface of the second conductive semiconductor layer, andwherein the roughness layer includes a lower surface having a shape corresponding to the top surface of the second conductive semiconductor layer.
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Abstract
A semiconductor light emitting device includes a substrate, a first conductive semiconductor layer, an active layer on the first conductive semiconductor layer, a second conductive semiconductor layer on the active layer, and a roughness layer on the second conductive semiconductor layer. The second conductive semiconductor layer includes a shape of multiple horns, and the roughness layer includes a shape of multiple horns. The second conductive semiconductor layer includes a roughness in which horn shapes and inverse-horn-shaped shapes are alternately formed, and the roughness has a height of about 0.5 μm to about 1.2 μm and a diameter of about 0.3 μm to about 1.0 μm.
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Citations
20 Claims
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1. A semiconductor light emitting device, comprising:
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a substrate; a first conductive semiconductor layer on the substrate; an active layer on the first conductive semiconductor layer; a second conductive semiconductor layer on the active layer, the second conductive semiconductor layer including a top surface and a bottom surface opposing to the top surface, the bottom surface being adjacent to the active layer; a roughness layer disposed on the second conductive semiconductor layer and including Al material; a conductive layer including Ti material on the roughness layer; and at least one of a first AlGaN based semiconductor layer disposed on the active layer and a second AlGaN based semiconductor layer disposed under the active layer, wherein the first conductive semiconductor layer includes a first GaN layer and the second conductive semiconductor layer includes a second GaN layer, wherein the second conductive semiconductor layer includes a plurality of apexes on the top surface, the distance between at least two apexes of the plurality of apexes is about 0.3 μ
m to about 1.0 μ
m,wherein the conductive layer includes a lower surface having a shape corresponding to the top surface of the second conductive semiconductor layer, and wherein the roughness layer includes a lower surface having a shape corresponding to the top surface of the second conductive semiconductor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor light emitting device, comprising:
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a first conductive semiconductor layer; an active layer on the first conductive semiconductor layer; a second conductive semiconductor layer on the active layer; a roughness layer on the second conductive semiconductor layer and including Al material; and a conductive layer on the roughness layer and including Ti material, wherein a top surface of the second conductive semiconductor layer includes a roughness, wherein the roughness layer includes a lower surface having a shape corresponding to the top surface of the second conductive semiconductor layer, and wherein the conductive layer includes a lower surface having a shape corresponding to the top surface of the second conductive semiconductor layer. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A semiconductor light emitting device, comprising:
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a first conductive semiconductor layer; an active layer on the first conductive semiconductor layer; a second conductive semiconductor layer on the active layer, the second conductive semiconductor layer including a top surface having a random structure in which protruding apex patterns and recessed valley patterns are arranged; a roughness layer directly on the second conductive semiconductor layer, the roughness layer including top and bottom surfaces with a random structure corresponding to the random structure of the second conductive semiconductor layer; and an electrode on the roughness layer, the electrode including a bottom surface with a random structure corresponding to the random structure of the second conductive semiconductor layer, wherein a height of one of the protruding apex patterns of the random structure of the second conductive semiconductor layer is different from a height of another protruding apex pattern placed next thereto, wherein a distance between two of the recessed valley patterns of the second conductive semiconductor layer placed next to each other is different from a distance between another two recessed valley patterns placed next thereto, wherein a height difference between an uppermost protruding apex pattern of the random structure of the second conductive semiconductor layer and a lowermost recessed valley pattern of the random structure of the second conductive semiconductor layer is in a range of about 0.5 μ
m to about 1.2 μ
m, andwherein a distance between two protruding apex patterns of the random structure of the second conductive semiconductor layer placed next to each other is in the range of about 0.3 μ
m to about 1.0 μ
m. - View Dependent Claims (18, 19, 20)
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Specification