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Abstract

A p-i-n photodiode included a heavily dopes epitaxially grown layer of semiconductor. The photodiode is comprised of heterojunctions of epitaxial material grown on an InP semiconductor substrate (12, 14). A heavily doped layer (20) is patterned on top of an InP layer (18) to define the source of p-type diffusion for the definition of the active region (22) of the p-n junction. The epitaxially grown source layer (20) may be comprised of ternary or quaternary III-V semiconductor alloys, typically In.sub.x Ga.sub.1-x As. The principle can be extended to alloy layers that are not lattice-matched to the InP substrate. The p-type dopant is typically Zn, but may also consist of other commonly used p-type dopants such as Be.

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First Claim