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- W2568763184 abstract "In this work, the 14 nm CPI (Chip and Package Interaction) challenges, development and qualification were investigated by using 80 um pitch Cu pillar BOL (Bump on Lead) technology in flip chip CSP package. We evaluated 14 nm BEOL (Backend of Line) film strength and adhesion in the torture tests as an early assessment. After passing the torture tests, the package is evaluated in the CPI reliability tests following the JEDEC standard. After the reliability tests, SAM (Scanning Acoustic Microscope) and typical electrical test were conducted to confirm any failures. Moreover, a 3D thermal-mechanical finite element model was built to analyze the stress field for early material assessment, selection and structure optimization. The simulation results revealed that package using CUF (Capillary Underfill) and MUF (Molded Underfill) has lower ULK (Ultra Low-k dielectric) and bump stresses than that using MUF only. Besides, thinner mold thickness can reduce ULK and bump stresses. CPI reliability test results showed all samples passed and no side-wall crack, bump / ULK crack and delamination were found by SAM and SEM (Scanning Electron Microscopy) cross-section check. We have successfully demonstrated the CPI solution for 14 nm chip using Cu pillar BOL technology in flip chip CSP package." @default.
- W2568763184 created "2017-01-13" @default.
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- W2568763184 date "2016-10-01" @default.
- W2568763184 modified "2023-09-25" @default.
- W2568763184 title "Chip package interaction development of flip chip CSP package with Cu pillar bump on lead for advanced node chip" @default.
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- W2568763184 doi "https://doi.org/10.1109/impact.2016.7800074" @default.
- W2568763184 hasPublicationYear "2016" @default.
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