Laminated Upper Cladding Structure For A Light Emitting Device

A fabrication method for providing a semiconductor light-emitting device includes growing a plurality of layers on a semiconductor substrate, including forming a lower cladding layer and an active region for generating lightwaves. A laminated cladding structure is formed on the active region. The laminated cladding structure includes a lower layer that is substantially aluminum-free to inhibit oxidation and includes an upper layer that is aluminum-bearing in order to promote oxidation. The upper layer of the lamination is oxidized along selected first regions and is selectively masked to prevent oxidation for second regions. The oxidation of the first region is carried out under conditions such that a native oxide is formed throughout the thickness of the first regions. Electrical current to the active region for operating the light-emitting device is channeled via the unoxidized region of the upper layer of the lamination. In a preferred embodiment, the device is an InGaAsP-AlInAs-InP laser. Other electronic devices, such as FETs, can be also formed using the top-down approach. Preferably, oxidation is limited to an upper III-V semiconductor layer by forming a lower III-V semiconductor layer that includes In and/or P. Lateral oxidation can also be realized using this approach.