ClassOne Technology Receives Order for Solstice® S8 Single-Wafer System from Finland’s VTT Technical Research Centre

November 9, 2023 Kalispell, MT —ClassOne Technology, a leading global provider of advanced electroplating and wet processing tools for microelectronics manufacturing, today announced that leading European research institution VTT Technical Research Centre of Finland has placed its first order for a ClassOne Solstice® S8 single-wafer system. VTT will leverage the tool’s production-proven electroplating capabilities to perform advanced through-silicon via (TSV) processes for a range of applications, from MEMS packaging to 3D integration of novel sensor chips and quantum computing.

This SEM image shows a high-aspect-ratio through-silicon via (TSV) filled using a Solsice S8 CopperMax single-wafer processing system from ClassOne Technology. VTT Technical Research Centre of Finland has purchased a Solstice S8 for copper TSV plating applications.

According to industry research firm Yole Group, the advanced packaging (AP) sector is expected to realize a compound annual growth rate of 10% between 2022 and 2028, exceeding US$78 billion by 2028.​ Primary market drivers are shifting, as mobile and consumer decrease share while automotive and telecoms gain. Dominant packaging technologies flip-chip, 2.5D/3D and system-in-package (SiP) are expected to represent 90% of the AP market by 2028.

VTT will use the Solstice system to add new copper TSV capabilities, enabling utilization of advanced electrolyte chemistries, and atomic layer deposition (ALD) seed layers for bottom-up TSV plating. “VTT has traditionally been focused on high-density bumps for detectors and basic packaging applications. As we turn our efforts toward advanced packaging, we seek to develop contemporary solutions for critical TSV and damascene processes,” said James Dekker, senior MEMS research scientist with VTT. “The Solstice system from ClassOne is vital to our work in these applications, which have been heretofore impossible to approach reliably.”

The Solstice single-wafer platform can combine multiple process technologies and chemistries in a single, small-footprint configuration for advanced chip packaging applications. VTT’s Solstice S8 system chambers will include Vacuum Prewet for high-aspect-ratio features; CopperMax™ and Copper Gen4 ECD for plating; and spin-rinse-dry (SRD) for clean, fast wafer drying post-plating.

Noted ClassOne Technology CEO Byron Exarcos, “We welcome VTT as a new customer for our Solstice platform. We’re seeing heightened interest in advanced packaging technologies from institutions and universities, and Solstice is perfectly poised to help them make the leap to single-wafer from batch processing. The work that VTT and other organizations are pursuing is vital to developing new capabilities that will impact the future of microelectronics manufacturing.”

The Solstice platform’s flexible operation combines automation with manual operation, making the tool attractive for both R&D and pilot-line use, both of which VTT will use the tool to pursue. In addition, the firm plans to provide access to the tool for qualified customers needing Solstice’s unmatched capabilities to help advance their production efforts. ClassOne will ship the Solstice S8 to VTT’s head facility in Espoo, Finland.


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