Monday, July 24, 2017

TechInsights Reviews Pixel Isolation Structures

TechInsights keeps publishing parts from Ray Fontaine's presentation at IISW 2017. The third part reviews modern pixel-to-pixel crosstalk reduction measures: Front-DTI and Back-DTI:

Sony dielectric-filled B-DTI structure from the 1.4 µm pixel featuring a 2.9 µm thick substrate extends to a depth of 1.9 µm from the back surface, although it extends to a depth of 2.4 µm deep at B-DTI intersections:

Samsung 1.12 µm pixel generation B-DTI trenches extend 1.3 µm deep into a 2.6 µm deep substrate:

Omnivision 1.0 µm pixel B-DTI extends 0.45 µm deep into the back surface of a 2.5 µm thick substrate:


  1. Which is better, Front-DTI or Back-DTI?

  2. Depends on where in the spectrum you want to reduce X-talk. Back-DTI is very effective in reducing blue electrical X-talk, whereas Front-DTI is effective in the green-red (and beyond) region


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