Reusable test chip for inline probing of three dimensionally arranged experiments
View Patent ↗A Characterization Vehicle (CV) and a method for forming it which yields a gain in efficiency for IC yield ramp improvements by enabling faster learning cycles and diagnosis while reducing costs. A plurality of SF experiments are combined into a single full flow mask set with many inline testing points. Smaller pads are arranged in a way supporting testing of interleaved pad frames, parallel testing, and the usage of stacked test structures, or Devices Under Test (DUT's).
1. An in-line testable characterization vehicle (CV) comprising at least three vertically stacked regions of a semiconductor wafer including at least one routing layer, said CV comprising at least:
a first vertically stacked region that includes at least:
six alpha-positioned first-region probing pads, said alpha-positioned first-region probing pads vertically disposed at the top of said first vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in a respective alpha position;
six beta-positioned first-region probing pads, said beta-positioned first-region probing pads vertically disposed at the top of said first vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in a respective beta position;
first, second, and third first-region passive test structures, some of said first-region passive test structures reachable via said alpha-positioned first-region probing pads and other(s) of said first-region passive test structures reachable via said beta-positioned first-region probing pads;
a second vertically stacked region, positioned directly above the first vertically stacked region, wherein the second vertically stacked region includes at least:
six alpha-positioned second-region probing pads, said alpha-positioned second-region probing pads vertically disposed at the top of said second vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the alpha position;
six beta-positioned second-region probing pads, said beta-positioned second-region probing pads vertically disposed at the top of said second vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the beta position;
first, second, and third second-region passive test structures, some of said second-region passive test structures reachable via said alpha-positioned second-region probing pads and other(s) of said second-region passive test structures reachable via said beta-positioned second-region probing pads; and,
a third vertically stacked region, positioned directly above the second vertically stacked region, wherein the third vertically stacked region includes at least:
six alpha-positioned third-region probing pads, said alpha-positioned third-region probing pads vertically disposed at the top of said third vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the alpha position;
six beta-positioned third-region probing pads, said beta-positioned third-region probing pads vertically disposed at the top of said third vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the beta position;
first, second, and third third-region passive test structures, some of said third-region passive test structures reachable via said alpha-positioned third-region probing pads and other(s) of said third-region passive test structures reachable via said beta-positioned third-region probing pads.
2. The CV of claim 1 , further comprising:
connections between at least some of the alpha-positioned, first-region probing pads and the alpha-positioned, second-region probing pads;
connections between at least some of the beta-positioned, first-region probing pads and the beta-positioned, second-region probing pads.
3. The CV of claim 2 , further comprising:
connections between at least some of the alpha-positioned, second-region probing pads and the alpha-positioned, third-region probing pads;
connections between at least some of the beta-positioned, second-region probing pads and the beta-positioned, third-region probing pads.
4. An in-line testable characterization vehicle (CV) comprising at least three vertically stacked regions of a semiconductor wafer, said CV comprising at least:
a first vertically stacked region that includes at least:
thirty-two alpha-positioned first-region probing pads, said alpha-positioned first-region probing pads vertically disposed at the top of said first vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in a respective alpha position;
thirty-two beta-positioned first-region probing pads, said beta-positioned first-region probing pads vertically disposed at the top of said first vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in a respective beta position;
a plurality of first-region passive test structures, some of said first-region passive test structures reachable via said alpha-positioned first-region probing pads and other(s) of said first-region passive test structures reachable via said beta-positioned first-region probing pads;
a second vertically stacked region, positioned directly above the first vertically stacked region, wherein the second vertically stacked region includes at least:
thirty-two alpha-positioned second-region probing pads, said alpha-positioned second-region probing pads vertically disposed at the top of said second vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the alpha position;
thirty-two beta-positioned second-region probing pads, said beta-positioned second-region probing pads vertically disposed at the top of said second vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the beta position;
a plurality of second-region passive test structures, some of said second-region passive test structures reachable via said alpha-positioned second-region probing pads and other(s) of said second-region passive test structures reachable via said beta-positioned second-region probing pads; and,
a third vertically stacked region, positioned directly above the second vertically stacked region, wherein the third vertically stacked region includes at least:
thirty-two alpha-positioned third-region probing pads, said alpha-positioned third-region probing pads vertically disposed at the top of said third vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the alpha position;
thirty-two beta-positioned third-region probing pads, said beta-positioned third-region probing pads vertically disposed at the top of said third vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the beta position;
a plurality of third-region passive test structures, some of said third-region passive test structures reachable via said alpha-positioned third-region probing pads and other(s) of said third-region passive test structures reachable via said beta-positioned third-region probing pads.
5. The CV of claim 4 , further comprising:
connections between at least some of the alpha-positioned, first-region probing pads and the alpha-positioned, second-region probing pads;
connections between at least some of the beta-positioned, first-region probing pads and the beta-positioned, second-region probing pads.
6. The CV of claim 5 , further comprising:
connections between at least some of the alpha-positioned, second-region probing pads and the alpha-positioned, third-region probing pads;
connections between at least some of the beta-positioned, second-region probing pads and the beta-positioned, third-region probing pads.
7. An in-line testable characterization vehicle (CV) comprising at least three vertically stacked regions of a semiconductor wafer, said CV comprising at least:
a first vertically stacked region that includes at least:
thirty-two alpha-positioned first-region probing pads, said alpha-positioned first-region probing pads vertically disposed at the top of said first vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in a respective alpha position;
thirty-two beta-positioned first-region probing pads, said beta-positioned first-region probing pads vertically disposed at the top of said first vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in a respective beta position;
a plurality of first-region test structures, some of said first-region test structures reachable via said alpha-positioned first-region probing pads and other(s) of said first-region test structures reachable via said beta-positioned first-region probing pads;
a second vertically stacked region, positioned directly above the first vertically stacked region, wherein the second vertically stacked region includes at least:
thirty-two alpha-positioned second-region probing pads, said alpha-positioned second-region probing pads vertically disposed at the top of said second vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the alpha position;
thirty-two beta-positioned second-region probing pads, said beta-positioned second-region probing pads vertically disposed at the top of said second vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the beta position;
a plurality of second-region test structures, some of said second-region test structures reachable via said alpha-positioned second-region probing pads and other(s) of said second-region test structures reachable via said beta-positioned second-region probing pads; and,
a third vertically stacked region, positioned directly above the second vertically stacked region, wherein the third vertically stacked region includes at least:
thirty-two alpha-positioned third-region probing pads, said alpha-positioned third-region probing pads vertically disposed at the top of said third vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the alpha position;
thirty-two beta-positioned third-region probing pads, said beta-positioned third-region probing pads vertically disposed at the top of said third vertically stacked region and horizontally positioned so that they contact respective probe leads of a probe card that is horizontally positioned in the beta position;
a plurality of third-region test structures, some of said third-region test structures reachable via said alpha-positioned third-region probing pads and other(s) of said third-region test structures reachable via said beta-positioned third-region probing pads.
8. The CV of claim 7 , further comprising:
connections between at least some of the alpha-positioned, first-region probing pads and the alpha-positioned, second-region probing pads;
connections between at least some of the beta-positioned, first-region probing pads and the beta-positioned, second-region probing pads.
9. The CV of claim 8 , further comprising:
connections between at least some of the alpha-positioned, second-region probing pads and the alpha-positioned, third-region probing pads;
connections between at least some of the beta-positioned, second-region probing pads and the beta-positioned, third-region probing pads.