Patent ID: 9219093
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A method of constructing a photo-die of an X-ray sensor, comprising: forming an oxide layer on a first side of a silicon wafer; forming an array of grid holes on a second side of the silicon wafer opposite the first side thereof; filling the grid holes with an oxide; forming an array of photodiodes on the first side of the silicon wafer by implanting the first side of the silicon wafer with p-type impurities and n-type impurities such that each photodiode of the array of photodiodes is aligned with a respective grid hole of the array grid holes; depositing a thin nitride layer on the first side of the silicon wafer; removing the oxide in the grid holes; coating sidewalls of the grid holes with an insulator stack; filling the grid holes with a scintillator material; heating the silicon wafer to crystallize the scintillator material; forming a multilevel metal stack over the photodiodes on the first side of the silicon wafer; and forming a plurality of metal pillars that are electrically connected to the photodiodes through the multilevel metal stack.