Advanced Short Defect Repair Technique for Enhancing Yield in Packaging Architectures

Heterogeneous integration with new 2.5 and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3\mathrm{D}$</tex> packaging architectures brings greater overall system performance but can result in large and sophisticated multi-die units where every defect can dramatically affect yield, translating to high scrap cost. This paper examines short defect shaping technology, specifically focusing on the challenges encountered when repairing small line/space (L/S) defects. The method is expected to result in significant scrap cost savings and consequently improve yield. The technology employs advanced algorithms for fine <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{L}/\mathrm{S}$</tex> ablation with minimal substrate penetration, targeting repairs down to 2/2 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mu \mathrm{m}$</tex>. System stability, spot size, and laser jitter are critical for precision. Integrated optical <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3\mathrm{D}$</tex> measurements and real-time feedback ensure accurate ablation without substrate damage.