Long wavelength pseudomorphic InGaNPAsSb type-I and type-II active layers for the gaas material system
US6859474B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 1, 2000 |
| Grant date | Feb 22, 2005 |
| Priority date | — |
| Expiry date | Dec 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/544
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention discloses improved structures of light-processing (e.g. light-emitting and light-absorbing/sensing) devices, in particular Vertical Cavity Surface Emitting Lasers (VCSELs), such as may find use in telecommunications applications. The disclosed VSCAL devices and production methods provide for an active region having a quantum well structure grown on GaAs-containing substrates, thus providing processing compatibility for light having wavelength in the range 1.0 to 1.6 μm. The active region structure combines strain-compensating barriers with different band alignments in the quantum wells to achieve a long emission wavelength while at the same time decreasing the strain in the structure. The improved functioning of the devices disclosed results from building them with multicomponent alloy layers having a large number of constituents. The invention discloses as a key constituent in the proposed alloy layers for the active region a substance, such as nitrogen (N), suitable for reducing bandgap energy (i.e., increasing light wavelength) associated with the layers while at the same time lowering the lattice constant associated with the structure and hence lowering strain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.