Image sensors and optical devices

What is the main purpose of deep trench isolation (DTI), in which deep trenches filled with insulators are formed between fine pixels?

  1. ATo prevent light or charge from leaking into neighboring pixels (crosstalk)
  2. BTo make pixels larger
  3. CTo eliminate the need for color filters
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Answer: A. To prevent light or charge from leaking into neighboring pixels (crosstalk)

As pixels shrink, light entering at an angle and charge generated deep in the silicon can spill into neighboring pixels, mixing colors and lowering resolution. Deep trenches between pixels block light and charge, suppressing this crosstalk.

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