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- W3048281908 abstract "The bonding temperature for Cu to Cu direct/hybrid bonding is usually higher than 300 °C. In this study, three types of 12” wafer were fabricated: nanotwinned Cu (nt-Cu) blanket, hybrid nt-Cu/SiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> dish shape, and hybrid nt-Cu/SiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> pad shape respectively. The <;111>-preferred orientation ratio on ntCu surface was analyzed to 75.1% on dish-shaped and 99.0% on pad-shaped wafers. The resistivity of nt-Cu blanket on the wafer was 2 × 10 <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>-8</sup> Ω.m at room temperature which is close to pure Cu. We had constructed the equation to calculate the <;111>-oriented surface proportion on polished dish-shaped wafer. To get the maximum of <;111>-oriented nt-Ct surface, the bottom-up plating without tilted nt-Cu grains is the solution. The root mean squared roughness value (Rq) of nt-Cu blanket and hybrid nt-Cu/SiO <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sub> were 0.56 and 1.47 nm before bonding, respectively. The near 90 % of achieved ratio of a good bonding interface without voids had finished on wafer-to-wafer bonding. In summary, the hybrid bonding is an extraordinary interconnection technology as well as benefits future trends in advanced package. Currently, the near 90% of <;111>-oriented nt-Cu surface is achieved and nt-Cu-to-ntCu bonding is carried out at low temperature of 250 °C for 1 h." @default.
- W3048281908 created "2020-08-13" @default.
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- W3048281908 date "2020-06-01" @default.
- W3048281908 modified "2023-09-27" @default.
- W3048281908 title "Nanotwinned Copper Hybrid Bonding and Wafer-On-Wafer Integration" @default.
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- W3048281908 doi "https://doi.org/10.1109/ectc32862.2020.00045" @default.
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