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- W4286571708 abstract "We report on scaled finFETs with a novel routing scheme enabling connection via buried power rails (BPR) from both wafer sides, with tight variability/matching control. On the frontside (FS), contacting to p/n S/D-epi and BPR is done, after M0A and VBPR vias patterning, in a single metallization step with an optimized preclean reducing R <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>ext</inf> while preserving a good BPR-VBPR contact interface. After wafer flipping, bonding and extreme thinning, highly scaled, ~323nm deep nano-through-Si-vias (nTSV) land on BPR, with tight overlay control and unchanged BPR resistance (26-29% lower with improved W-fill). By moving the power delivery network to the backside (BSPDN), besides alleviating routing congestion on the FS, considerably less dynamic and static IR drop values are predicted from on-chip power heat maps generated for a low power 64-bit CPU at 2nm design rules: 82% and 96% less (worst-case values) vs. a reference configuration, respectively. P/NMOS show similar or even superior I <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>ON</inf> -I <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>OFF</inf> after BS processing and extra anneal(s) added for V <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>T</inf> recovery, mobility and BTI improvement - up to 8/15% higher I <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>ON</inf> linked to anneal selection." @default.
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- W4286571708 date "2022-06-12" @default.
- W4286571708 modified "2023-10-13" @default.
- W4286571708 title "Scaled FinFETs Connected by Using Both Wafer Sides for Routing via Buried Power Rails" @default.
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- W4286571708 doi "https://doi.org/10.1109/vlsitechnologyandcir46769.2022.9830177" @default.
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