Surface activated bonding of copper through silicon vias and gold stud bumps at room temperature
Why this work is in the frame
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Bibliographic record
Abstract
A comprehensive investigation of the surfaces of copper through silicon vias (Cu-TSVs) and gold stud bumps is presented. These vias and stud bumps were bonded at room temperature using a nanobonding and interconnection equipment. The influence of heating on the bonded interface was also studied. In order to achieve an intimate contact between the Au-stud bumps and Cu-TSVs, the stud bumps were flattened under an external force of 20 N before bonding. The surface roughness of the flattened area was improved due to deformation of the bumps. Specimens with high deformation provided better alignment accuracy than those with low deformation. The Cu-TSV surface showed inhomogeneous behavior due to the influence of electroplating and chemical mechanical polishing. Tensile pulling test of the bonded interfaces showed three fractures modes in the bulk of the Au bump and the Au pad. The electrical resistance of the bonded interface was dependent on the surface morphology of the bumps and TSVs, the distance between the bumps and TSVs, the locations of the bumps and TSV with respect to the argon fast atom beams, and the distribution of external force during bonding. Heating at 200 °C for 60 h in air increased the electrical resistance of the bonded interface. This investigation shows that the vertical integration of Au/Cu at room temperature and low bonding force can be applied to three-dimensional interconnections for low cost miniaturized systems.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it