SEMICONDUCTOR LAYER STRUCTURE WITH OVER LATTICE
First Claim
1. A semiconductor layer structure, comprising an active layer and a superlattice composed of stacked layers of a first and at least one second type, wherein said layers of said first type and of said at least one second type are III-V compound semiconductors, adjacent layers of different types in said superlattice differ in composition with respect to at least one element, said layers have predefined layer thicknesses, and layer thicknesses of said layers of said first type and said layers of said second type increase from layer to layer with increasing distance from said active layer.
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Abstract
The semiconductor layer structure includes an active layer (6) and a superlattice (9) composed of stacked layers (9a, 9b) of III-V compound semiconductors of a first (a) and at least one second type (b). Adjacent layers of different types in the superlattice (9) differ in composition with respect to at least one element. The layers (9a, 9b) have predefined layer thicknesses, such that the layer thicknesses of layers (9a) of the first type (a) and of the layers (9b) of the second type (b) increase from layer to layer with increasing distance from an active layer (6). An increasing layer thickness within the layers of the first and the second type (a, b) is suitable for adapting the electrical, optical and epitaxial properties of the superlattice (9) to given requirements in the best possible manner.
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12 Claims
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1. A semiconductor layer structure, comprising an active layer and a superlattice composed of stacked layers of a first and at least one second type, wherein
said layers of said first type and of said at least one second type are III-V compound semiconductors, adjacent layers of different types in said superlattice differ in composition with respect to at least one element, said layers have predefined layer thicknesses, and layer thicknesses of said layers of said first type and said layers of said second type increase from layer to layer with increasing distance from said active layer.
Specification