Patent ID: 7927909
Filing Date: 2011-04-19
Classification: H01L,Y02E

Abstract:
1. A method for fabricating a germanium (Ge) photodiode array on a glass substrate, the method comprising: providing a Ge substrate selected from a group consisting of non-doped and lightly doped with a first dopant selected from a group consisting of n and p type dopants, the Ge substrate having a first surface and a second surface; moderately doping the first surface of the Ge substrate with the first dopant; bonding the first surface of the Ge substrate to a glass substrate top surface; heavily doping a first region of the Ge substrate second surface with the first dopant; heavily doping a second region of the Ge substrate second surface with a second dopant, having an opposite electron affinity than the first dopant, forming a pn junction; forming an interlevel dielectric (ILD) layer overlying the Ge substrate second surface; etching contact holes in the ILD layer overlying the first and second regions of the Ge substrate second surface; and, filling the contact holes with metal and forming metal pads overlying the contact holes.