Back to results
US 6,324,201 B1Granted
Light emitting semiconductor element capable of suppressing change of driving current
AssigneeNEC Corporation
InventorsMasaki Ohya, Kenji Endo
Life of this patent
Estimating the term…
Abstract
A light emitting semiconductor element comprises a first additive layer which is added into a cladding layer or a middle layer. The first additive layer has a lattice constant which is different from a lattice constant of a semiconductor substrate. The light emitting semiconductor element is attached to a heat sink to form a laser device. The heat sink gives deformation to the light emitting semiconductor element. The first additive layer generates strain therein and suppresses influence of the deformation.
Claims16
A light emitting semiconductor element comprising:
- a semiconductor substrate having a first conductive type and a first lattice constant;
- a first cladding layer having said first conductive type formed on said semiconductor substrate;
- an active layer formed on said first cladding layer;
- a second cladding layer having a second conductive type formed on said active layer;
- a contact layer;
- a middle layer having a function as a buffer between said second layer and said contact layer;
- and
- an added strained layer formed on said second cladding layer or on said middle layer and having a second lattice constant different from said first lattice constant.
5 more elements
A light emitting semiconductor element comprising:
- a semiconductor substrate having a first conductive type and a first lattice constant;
- a first cladding layer having said first conductive type formed on said semiconductor substrate;
- an active layer formed on said first cladding layer;
- a second cladding layer having a second conductive type formed on said active layer;
- a contact layer;
- a middle layer having a function as a buffer between said second cladding layer and said contact layer;
- and
- an added strained layer formed on said second cladding layer or on said middle layer and having a second lattice constant different from said first lattice constant, wherein said first additive layer forms said second cladding layer or said middle layer.
5 more elements
Dependencies are inferred from the claim text.