A Study on Measuring Contact Resistance of Ball Bonds on Thin Metallization
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Bibliographic record
Abstract
Contact resistance measurement configurations for the evaluation of ball bond reliability on thin metallizations are studied. Samples with symmetrical and asymmetrical four-wire probe configurations are analyzed and compared with a calibrated finite-element model. It is found that the measured contact resistance strongly depends on the geometric placement of the probe wires, and the value closest to the true value is obtained from a probe placement that is opposite and away from high-current-density regions on the metallization. Probes should also be placed as close as possible to the contact interface. Sheet resistance components contributed by intermediate thin metallizations are of the same order of magnitude as the unaged reported RC. Therefore, they are considered. Symmetrical current distributions yield a more homogeneous potential drop across the bond interface being probed, but also capture a larger component of metallization sheet resistance. Experimental samples were aged, and the contact resistance increase was measured. The impacts of various probe placements on the sensed RC were studied.
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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 | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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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