Patent ID: 9202829
Filing Date: 2015-12-01
Classification: H01L

Abstract:
1. A light sensor comprising a plurality of regions of a first conductivity type formed in a semiconductor layer or a substrate of a second conductivity type, said regions of the first conductivity type connected to form a first electrode of a photodiode, said semiconductor layer or a substrate of the second conductivity type forming a second electrode of a photodiode; trenches formed between said regions of the first conductivity type; wherein the spectral sensitivity to infrared is reduced by the carrier recombination at the trench-silicon interface, wherein said trenches are deeper than said regions of the first conductivity type and as deep as 30 μm and wherein the interface trap density is increased for the trench portion in said semiconductor layer of the second conductivity type while the interface trap density is kept low for the trench portion in said regions of the first conductivity type.