TEST & MEASUREMENT
No longer optional: Precision sensing for yield improvement in advanced semiconductor manufacturing
How Kistler empowers semiconductor equipment manufacturers for the next era of 3D heterogeneous chip integration By Robert Hillinger, Kistler Industry Lead Semiconductor
T
he semiconductor industry has entered a phase in which every micron counts, each defect costs thousands of dollars and process stability is non-negotiable. From grinding, CMP, thermocompression bonding to advanced testing, machine builders can no longer treat advanced sensing technology as an add-on. Traditionally, MEMS or strain gauge (DMS) sensors were used, but their resolution and stability Integrating high-precision piezoelectric sensor systems, such as those from Kistler, as early as possible in the R&D phase of semiconductor equipment design has become indispensable for meeting the rising semiconductor manufacturing by stacking and interconnecting logic, memory, RF and chiplets into compact, high-performance systems. This technology enables breakthroughs in AI, high-performance computing (HPC) and 5G/6G. However, the complexity of wafer bonding, die stacking and through-silicon via (TSV) processes and incorporate fragile new materials, tolerances for force, pressure, vibration and temperature become critically tight. Yield risks emerge in every step, from alignment in wafer-to-wafer bonding, to pick-and-place, and pressure-induced cracks in encapsulation. At the same time, the economic impact of defects increases quickly. Each of the failure modes named above can multiply costs, each worth several thousand dollars apiece. The conclusion is inevitable for both equipment manufacturers and semiconductor fabs: only machines with built-in, high-precision monitoring and control can ensure process stability, safeguard yield and protect the massive
Heterogeneous 3D integration requires maximum process stability since even minimal deviations yield losses.
value tied to every wafer.
Why semiconductor equipment manufacturers carry the burden of precision
They are at the heart of this transformation, setting industry standards for precision, reliability and throughput. In the past, and mechanical accuracy. Today, semiconductor manufacturers demand far more, including embedded sensors, closed- loop process control and traceable quality data that enables predictive maintenance. As a result, machines are evolving from precise mechanical tools into intelligent systems with built-in monitoring and adaptive control.
Failure modes:
Where yield is put at risk 3D integration introduces many different complex and costly failure modes. Methods, such as inline optical inspection, can detect defects, for example, cracks and misalignment. More damaging risks occur during production and remain invisible to these techniques. Thermal-mechanical
30 MARCH 2026 | ELECTRONICS FOR ENGINEERS
(CTE) mismatches can cause warpage or micro-cracks. TSV processes are prone which compromise electrical integrity. As well a shift or tilt of a few microns during pick-and-place can disrupt chip alignment and prevent accurate contact matching between interconnect structures, while incorrect pressure during encapsulation can damage fragile dies.
Advanced sensor technologies: The backbone of smart, high-yield 3D integration
High-resolution piezoelectric force sensors integrated directly into bonding heads provide continuous monitoring to portfolio allows semiconductor equipment manufacturers to implement closed-loop control and ensure consistent process transparency. It also provides high resolution with reliable signal integrity data for process optimisation and traceability. At the same time, the sensors remain stable and reliable even in high-temperature bonding and encapsulation, and are also suitable for
Picture credit: Kistler Group
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