Main Impact Factors on Internal Stress of Electroless Deposited Copper Films
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Bibliographic record
Abstract
Electroless deposition of thin Cu layers is one of the crucial steps during the manufacturing of printed circuit boards (PCBs). Electroless Cu serves as a conductive seed layer on nonconductive substrate material (epoxy, polyimide, glass, etc.) for the subsequent deposition of electrolytic Cu. In through holes and blind micro vias a dense and well adhering seed layer is essential to assure functionality and reliability of the final product. Adhesion of electroless Cu layers on dielectrics is mainly attributed to mechanical anchoring. Therefore surface roughness of the substrate enhances adhesion. However, to comply with the continuing trend towards miniaturization, smoother dielectrics are employed to allow reduced line and space dimensions. Recently introduced novel substrate materials are prone to spontaneous delamination failures (blistering) of the electroless layer during deposition. A higher Ni content in electroless Cu electrolyte prevents this delamination failure by increasing the internal tensile stress in the Cu layer. This effect is achieved by suppressing Cu self-diffusion through the incorporation of small amounts of Ni in the grain boundaries and the grain boundary junctions. Apart from the Ni-concentration in the electroless Cu-bath, here we investigate additional influence parameters on the internal film stress, e.g. the concentration of NaOH, cyanide and solution flow of the bath. Some of these parameters modify the internal film stress indirectly by influencing the amount of codeposited Ni. This provides a first insight into mechanisms of Ni-codeposition during electroless Cu plating.
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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