Photodetector for use in optical pickup reproducing apparatus, has epitaxial layer induced with high electric field by two-type fingers, and regrown epitaxial layer absorbing short wavelength light and formed on fingers

摘要

The photodetector has a substrate supporting upper layers, and an epitaxial layer (103) formed on the substrate. Heavily doped two-type fingers are embedded in the layer to small depth. A well is formed in the layer disposed outside the fingers. The epitaxial layer is induced with high electric field by the fingers. A regrown epitaxial layer for absorption of short wavelength light is formed on the fingers. An independent claim is also included for a method of manufacturing a photodetector.