Patent ID: 6057592
Filing Date: 2000-05-02
Classification: H01L

Abstract:
A compound semiconductor epitaxial wafer in which an alloy composition gradient layer of gallium arsenide phosphide GaAs.sub.x P.sub.1-x or GaAs.sub.1-y P.sub.y having an alloy composition x or y of group V element not composing a substrate of compound semiconductor single crystal of gallium phosphide GaP or gallium arsenide GaAs being changed in a range of 0 to 1 with a thickness direction is formed on the substrate, and a composition constant layer of gallium arsenide phosphide GaAs.sub.a P.sub.1-a or GaAs.sub.1-b P.sub.b having an alloy composition a or b (where 0<a.ltoreq.1, and 0<b.ltoreq.1) of group V element not composing the substrate is formed above the alloy composition gradient layer; characterized in that at least one combination of a composition ascending zone having the alloy composition x or y ascending with a thickness direction of the alloy composition and a crystal stabilizing zone following the composition ascending zone and having the alloy composition x or y descending therewith is formed within said alloy composition gradient layer as distributed in a layer thickness direction, wherein an ascending rate of the alloy composition x or y in said composition ascending zone is 0.1 to 20 with respect to an increase of 1 .mu.m of a growth layer, and a descending rate of the alloy composition x or y in said crystal stabilizing zone is 0.005 to 0.05 with respect to an increase of 1 .mu.m of the growth layer.