Feature: Interconnections
Henniker has developed a simple,
low-cost alternative method based on plasmas generated using water vapor, which effectively removes contamination and oxide layers without any potential drawbacks; see Figures 6 and 7. Following plasma treatment, wire
bond strength is evaluated using both destructive pull tests (DPTs) and non- destructive pull tests (NDPTs). The results in Figure 8 compare
pull strengths for different cleaning methods and clearly demonstrate both the significant bond improvement and the reduction in variability that can be achieved using plasma cleaning.
Real-world application Henniker Plasma is a UK manufacturer of plasma treatment systems for cleaning, surface activation to improve adhesion, and functional nano-scale coating. Its systems are known for their reliability and delivery of ultra-fine surface preparation. Backed up by over 20 years of
experience, Henniker’s innovative plasma treatment equipment (Figure 9) is used globally in critical industrial manufacturing settings, enabling leading manufacturers to solve key adhesion challenges with a wide range of reliable, robust equipment and innovative processes, and in academic research, helping to support a wide range of fundamental research with inexpensive, fully-automated bench-top plasma systems that require little or no expertise for operation. Henniker’s advanced plasma systems
are configurable tools that are both robust enough for reliable, repeatable industrial processing and flexible enough for research into, and development of, leading-edge plasma processes. They transform materials by enabling a unique range of new properties, including hydrophobic, hydrophilic and biocompatibility, adding significant functionality and value. One of Henniker’s system users in the
UK is Solid State Supplies, which offers end-to-end solutions for optoelectronic and display assemblies.
Figure 3: Copper lead frame
Figure 1: Wire-bonded silicon chip
Figure 2: Diagram of a typical wire bond
www.electronicsworld.co.uk December/January 2023 41
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