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Tuesday, August 23, 2011

Samsung Proposes Convex BSI Diodes

Samsung patent application US20110193147 proposes BSI pixel with convex etched shape of photodiodes on the back side:


The planarisation layers 150 and 170 help to keep color filters 160 and microlens 180 flat in this embodiment. Other versions omit layer 150, so that color filter follows the PD shape.

The manufacturing process includes etching out the islands like this:


and then melting them into a spherical shape using "a thermal process":

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2 comments:

  1. AnonymousAugust 23, 2011 at 9:40 PM

    so, basically the benefit is that you end with with larger photo sensitive area, making the QE go up?

    ReplyDelete
  2. Vladimir KoifmanAugust 23, 2011 at 11:37 PM

    The additional focusing of the curved surface helps to keep the light inside pixel, thus improves QE and reduces crosstalk.

    ReplyDelete

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