Patent ID: 9577136
Date: 2017-02-21
CPC Classifications: G02B,H01L,H04J

Claim:
1. A method for manufacturing a semiconductor light-receiving element comprising: implanting impurity ions of a first conductivity type into at least a portion of a surface of a substrate of which the surface is a single crystal Si layer and annealing the impurity ions for activation; growing a non-doped Ge layer on at least a Si region of the first conductivity type into which impurity ions of the first conductivity type have been implanted; forming, on a surface of the non-doped Ge layer, a first dielectric mask that covers a region on which a photodiode is to be formed; implanting impurity ions of a second conductivity type that is the opposite conductivity type of the first conductivity type into an exposed portion of the non-doped Ge layer using the first dialectic mask as a mask; compensating the surface with impurities of the first conductivity type by implanting the impurities of the first conductivity type into the exposed portion of the non-doped Ge layer at a location that is shallower than the impurities of the second conductivity type using the first dielectric mask as a mask; forming a second dielectric mask from which only the region on which a photodiode is to be formed is exposed; implanting impurities of the second conductivity type into an exposed surface of the non-doped Ge layer using the second dielectric mask as a mask; and annealing the implanted impurities for activation.