crystal lattice

By: dmcq (dmcq.delete@this.fano.co.uk), June 27, 2022 3:58 pm
Room: Moderated Discussions
hobold (hobold.delete@this.vectorizer.org) on June 27, 2022 12:09 pm wrote:
> Anon (no.delete@this.thanks.com) on June 27, 2022 3:34 am wrote:
> > Groo (charlie.delete@this.semiaccurate.com) on June 26, 2022 9:39 am wrote:
> > > It is a tad more expensive but not a significant cost in relation to a finished wafer on a modern
> > > process. The biggest reason you don't want to do it is the loss of edge area for I/O.
> >
> > I guess the obvious answer to that would be triangular dies? They still tesselate
> > nicely, but they give you higher edge area for a given die size.
>
> I was under the impression that the structures etched into
> the wafer are aligned with the silicon crystal lattice?
>
> I believe silicon crystallizes as a face centered cubic lattice. That would be compatible
> with some cartesian 2D grid on the wafer surface (i.e. the usual right angles and
> rectangles), but not fully compatible with a honeycomb/hexagonal grid[*].
>
> Octagonal would fit better with the crystal; that is, horizontal and vertical as usual, plus the two
> 45 degree diagonal directions. While you cannot tile the plane with regular octagons, there is a semi-regular
> grid that would fit the capabilities of the laser cutter that Groo described. Start with any regular
> grid of square cells; then add all diagonals to all squares, and you get a new square grid, smaller
> and rotated by 45 degrees. Repeat to reach a desired granularity/resolution.
>
>
> [*] unless you take those cubes and stand them on a corner, to get a regular hexagon as an "equator".
>
> Okay, enough useless wise-cracking for one post. :-)

I think you probably missed the bit where the laser disrupts the crystalline structure so it is amorphous where the breaks go.
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TopicPosted ByDate
OK dumb question timeDoug S2022/06/24 01:31 PM
  OK dumb question timeanon52022/06/24 01:38 PM
  Silicon ingots are round.Mark Roulo2022/06/24 02:29 PM
    Silicon ingots are round.Squarehead2022/06/24 02:38 PM
      Silicon ingots are round.Mark2022/06/24 03:00 PM
        Silicon ingots are round.Gary Kopp2022/06/24 03:20 PM
      Silicon ingots are round.Adrian2022/06/24 11:34 PM
    Silicon ingots are round.tarlinian2022/06/24 03:38 PM
      Silicon ingots are round.Doug S2022/06/24 11:13 PM
        Silicon ingots are round.anon2022/06/25 11:34 AM
          Silicon ingots are round.Doug S2022/06/25 11:39 AM
            Silicon ingots are round.Groo2022/06/26 09:41 AM
              Silicon ingots are round.Doug S2022/06/26 12:05 PM
                Silicon ingots are round.Gtoo2022/06/26 02:55 PM
          Silicon ingots are round.rwessel2022/06/25 11:43 AM
            Not reallyGroo2022/06/26 09:39 AM
              Not reallydmcq2022/06/26 10:56 AM
                Not reallyGroo2022/06/26 02:58 PM
              Not reallyanon22022/06/26 05:22 PM
              Why not triangles? Anon2022/06/27 03:34 AM
                Why not triangles? Math Nerd2022/06/27 04:52 AM
                Why not triangles? Math Nerd2022/06/27 05:45 AM
                  Don't forget Penrose Tiling (NT)ananon2022/06/27 06:06 AM
                  Why not triangles? Doug S2022/06/27 07:43 AM
                  Why not triangles? Anon2022/06/27 08:33 AM
                    Die shape that minimizes wasted area on circular wafersMath Nerd2022/07/01 09:20 PM
                      Die shape that minimizes wasted area on circular wafersBrett2022/07/02 02:35 PM
                        Die shape that minimizes wasted area on circular wafersMath Nerd2022/07/02 04:15 PM
                        Die shape that minimizes wasted area on circular wafersMark Roulo2022/07/02 04:41 PM
                          Die shape that minimizes wasted area on circular wafersDoug S2022/07/02 06:44 PM
                          Die shape that minimizes wasted area on circular wafersBrett2022/07/03 12:31 AM
                            Die shape that minimizes wasted area on circular wafersAdrian2022/07/03 10:25 PM
                              Die shape that minimizes wasted area on circular wafersanon22022/07/03 11:33 PM
                                Die shape that minimizes wasted area on circular wafersBrett2022/07/04 12:45 AM
                                  Die shape that minimizes wasted area on circular wafersdmcq2022/07/04 06:09 AM
                                    Die shape that minimizes wasted area on circular wafersJames2022/07/04 09:52 AM
                                      Die shape that minimizes wasted area on circular wafersdmcq2022/07/04 10:26 AM
                                        Die shape that minimizes wasted area on circular wafersAdrian2022/07/05 03:28 AM
                                      Cannon Lake vs Kaby LakeMark Roulo2022/07/04 10:30 AM
                                        C-class bonusesblue2022/07/04 12:27 PM
                                          C-class bonusesanonymou52022/07/04 03:23 PM
                                  Die shape that minimizes wasted area on circular wafersanon22022/07/04 06:53 AM
                                    Die shape that minimizes wasted area on circular wafersBrett2022/07/04 12:32 PM
                                      Die shape that minimizes wasted area on circular wafersFoyle2022/07/04 01:30 PM
                                        Die shape that minimizes wasted area on circular wafersAnon2022/07/04 01:37 PM
                                          What is a mirrored die?Mark Roulo2022/07/04 02:59 PM
                                            What is a mirrored die?Brett2022/07/04 03:32 PM
                                              What is a mirrored die?Doug S2022/07/04 10:08 PM
                                        Die shape that minimizes wasted area on circular wafersanonymou52022/07/04 03:12 PM
                                          Die shape that minimizes wasted area on circular wafersFoyle2022/07/05 10:41 AM
                                      Die shape that minimizes wasted area on circular wafersanon22022/07/04 04:52 PM
                                        Die shape that minimizes wasted area on circular wafersUngo2022/07/05 06:24 PM
                                          Die shape that minimizes wasted area on circular wafersBrett2022/07/05 07:56 PM
                                            Die shape that minimizes wasted area on circular wafersanonymou52022/07/06 05:46 AM
                                              Die shape that minimizes wasted area on circular wafersdmcq2022/07/06 02:55 PM
                                                Die shape that minimizes wasted area on circular wafersMark Roulo2022/07/06 04:09 PM
                                                Die shape that minimizes wasted area on circular wafersDoug S2022/07/06 05:31 PM
                                      Example of mirrored wafer?Mark Roulo2022/07/04 06:01 PM
                                  Not the same as 3-core CPU from a 4-core dieMark Roulo2022/07/04 09:31 AM
                                Wafer probingAdrian2022/07/05 03:08 AM
                                  Great comment, thank you (NT)anon22022/07/06 12:00 AM
                crystal latticehobold2022/06/27 12:09 PM
                  crystal latticedmcq2022/06/27 03:58 PM
                  Given path dependency I doubt it ...Mark Roulo2022/06/27 06:02 PM
                    Given path dependency I doubt it ...Adrian2022/06/27 10:01 PM
              Hexagonal DieMath Nerd2022/06/27 05:05 AM
                Hexagonal DieAdrian2022/06/27 10:24 PM
                  Hexagonal Diedmcq2022/07/06 03:00 PM
          Silicon ingots are round.dmcq2022/06/25 02:38 PM
            Silicon ingots are round.dmcq2022/06/25 02:43 PM
          Silicon ingots are round.aaron spink2022/06/25 03:05 PM
      Notch on Silicon WafersEric P2022/07/01 04:07 PM
        Still there, I think ...Mark Roulo2022/07/01 04:47 PM
          Still there, I think ...Eric P2022/07/01 05:26 PM
            Still there, I think ...tarlinian2022/07/01 06:50 PM
              Still there, I think ...David Kanter2022/07/02 09:14 AM
            Still there, I think ...Mark Roulo2022/07/01 09:31 PM
              Still there, I think ...Eric P2022/07/02 12:10 AM
  OK dumb question timeanonymouse2022/06/24 03:47 PM
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