Patent ID: 8778725
Filing Date: 2014-07-15
Classification: H01L,Y02E

Abstract:
1. A method of fabricating an avalanche photodiode (APD), comprising: heavily doping a substrate with dopants of a second electrical polarity; depositing a first intrinsic Si layer on the substrate; forming a current confinement layer by implanting the first intrinsic Si layer with dopants of the second electrical polarity; depositing a second intrinsic Si layer on the current confinement layer to form a multiplication layer; implanting a top portion of the multiplication layer with dopants of a first electrical polarity to form an electric field control layer; depositing an intrinsic Ge layer on the electric field control layer to form an absorption layer; depositing an intrinsic amorphous Si layer on the absorption layer; implanting the intrinsic amorphous Si layer with dopants of the first electrical polarity to form a contact layer; and performing silicide formation and metallization.