Patent ID: 9331117
Filing Date: 2016-05-03
CPC Classification: G03F,H01L

Claim Text:
1. A method of making a backside-illuminated radiation sensor comprising: disposing a layer of p-doping protective material on a first substrate comprising a semiconductor layer, wherein the layer of p-doping protective material is formed at a second surface of the semiconductor layer at a temperature greater than 500° C.; disposing a p-doped semiconductor layer on the layer of p-doping protective material; disposing a region of n-doped semiconductor at a first surface of the p-doped semiconductor layer such that a photodiode is formed with a depletion region between the region of n-doped semiconductor and the p-doped semiconductor layer; disposing circuitry on top of the photodiode; inverting the semiconductor layer such that the second surface of the semiconductor layer is the backside-illuminated surface of the radiation sensor, and wherein the layer of p-doping protective material is formed before the p-doped semiconductor layer.