Abstract: A light-emitting device includes: a substrate having a top surface, wherein the top surface comprises a first portion and a second portion; a first semiconductor stack on the first portion, comprising a first upper surface and a first side wall; and a second semiconductor stack on the first upper surface, comprising a second upper surface and a second side wall, and wherein the second side wall connects the first upper surface; wherein the first semiconductor stack comprises a dislocation stop layer; wherein the dislocation stop layer comprises AlGaN; and wherein the first side wall and the second portion of the top surface form an acute angle ? between thereof.

Abstract: A light-emitting device includes: a substrate having a top surface, wherein the top surface comprises a first portion and a second portion; a first semiconductor stack on the first portion, comprising a first upper surface and a first side wall; and a second semiconductor stack on the first upper surface, comprising a second upper surface and a second side wall, and wherein the second side wall connects the first upper surface; wherein the first semiconductor stack comprises a dislocation stop layer; wherein the dislocation stop layer comprises AlGaN; and wherein the first side wall and the second portion of the top surface form an acute angle a between thereof

Abstract: A light-emitting device includes a substrate having a top surface, wherein the top surface includes a first portion and a second portion; a first semiconductor stack on the first portion, including a first upper surface and a first side wall; and a second semiconductor stack on the first upper surface, including a second upper surface and a second side wall, and wherein the second side wall connects the first upper surface; wherein the first semiconductor stack includes a dislocation stop layer; and wherein the first side wall and the second portion of the top surface form an acute angle ? between thereof.

Abstract: A manufacturing method of a light-emitting device includes steps of: providing a substrate with a top surface, wherein the top surface comprises a plurality of concavo-convex structures; forming a semiconductor stack on the top surface; forming a trench in the semiconductor stack to define a plurality of second semiconductor stacks and expose a first upper surface; forming a scribing region which extends from the first upper surface into the semiconductor stack and exposes a side surface of the semiconductor stack to define a plurality of first semiconductor stacks; removing a portion of the plurality of first semiconductor stacks and a portion of the concavo-convex structures trough the region to form a first side wall of each of the first semiconductor stack; and dividing the substrate along the region; wherein the first side wall and the top surface form an acute angle ? between thereof, 30°???80°.

Abstract: A light-emitting device includes a substrate having a top surface, wherein the top surface includes a first portion and a second portion; a first semiconductor stack on the first portion, including a first upper surface and a first side wall; and a second semiconductor stack on the first upper surface, including a second upper surface and a second side wall, and wherein the second side wall connects the first upper surface; wherein the first semiconductor stack includes a dislocation stop layer; and wherein the first side wall and the second portion of the top surface form an acute angle ? between thereof.

Abstract: A light-emitting device includes a substrate having a top surface, wherein the top surface includes a first portion and a second portion; a first semiconductor stack including a first upper surface and a first side wall, wherein the first semiconductor stack is on the first portion; a second semiconductor stack including a second upper surface and a second side wall, wherein the second semiconductor stack is on the first upper surface, and wherein the second side wall is devoid of connecting the first side wall; a plurality of first concavo-convex structures on the first portion; and a plurality of second concavo-convex structures on the second portion; wherein the first side wall and the second portion of the top surface form an acute angle ? between thereof; and wherein the second concavo-convex structures have smaller size than that of the first concavo-convex structures.

Abstract: The semiconductor device includes a first conductivity-type semiconductor structure comprising a first stack and a second stack, wherein the first stack comprises alternate first layers and second layers, the second stack comprises alternate third layers and fourth layers. The semiconductor device includes a second conductivity-type semiconductor structure on the first conductivity-type semiconductor and includes an active structure between the first conductivity-type semiconductor structure and the second conductivity-type semiconductor structure. The first stack is between the active structure and the second stack, and a first difference between a maximum of the first doping concentration of one of the first layers and a minimum of the second doping concentration of one of the second layers is less than a second difference between a maximum of the third doping concentration of one of the third layers and a minimum of the fourth doping concentration of one of the fourth layers.

Abstract: A light-emitting device includes a substrate having a top surface, wherein the top surface includes a first portion and a second portion; a first semiconductor stack including a first upper surface and a first side wall, wherein the first semiconductor stack is on the first portion; a second semiconductor stack including a second upper surface and a second side wall, wherein the second semiconductor stack is on the first upper surface, and wherein the second side wall is devoid of connecting the first side wall; a plurality of first concavo-convex structures on the first portion; and a plurality of second concavo-convex structures on the second portion; wherein the first side wall and the second portion of the top surface form an acute angle ? between thereof; and wherein the second concavo-convex structures have smaller size than that of the first concavo-convex structures.

Abstract: The semiconductor device includes a first conductivity-type semiconductor structure comprising a first stack and a second stack, wherein the first stack comprises alternate first layers and second layers, the second stack comprises alternate third layers and fourth layers. The semiconductor device includes a second conductivity-type semiconductor structure on the first conductivity-type semiconductor and includes an active structure between the first conductivity-type semiconductor structure and the second conductivity-type semiconductor structure. The first stack is between the active structure and the second stack, and a first difference between a maximum of the first doping concentration of one of the first layers and a minimum of the second doping concentration of one of the second layers is less than a second difference between a maximum of the third doping concentration of one of the third layers and a minimum of the fourth doping concentration of one of the fourth layers.

Abstract: A light-emitting device comprises a substrate having an top surface; a first semiconductor stack comprising a first upper surface and a first side wall, wherein the first semiconductor stack is on the top surface and exposes an exposing portion of the top surface; a second semiconductor stack comprising a second side wall, wherein the second semiconductor stack is on the first upper surface and exposes an exposing portion of the first upper surface; wherein the first side wall and the exposing portion of the top surface form an acute angle ? between thereof, and the second side wall and the exposing portion of the first upper surface form an obtuse angle ? between thereof.

Abstract: A light-emitting device comprises a substrate having an top surface; a first semiconductor stack comprising a first upper surface and a first side wall, wherein the first semiconductor stack is on the top surface and exposes an exposing portion of the top surface; a second semiconductor stack comprising a second side wall, wherein the second semiconductor stack is on the first upper surface and exposes an exposing portion of the first upper surface; wherein the first side wall and the exposing portion of the top surface form an acute angle a between thereof, and the second side wall and the exposing portion of the first upper surface form an obtuse angle ? between thereof.