Alchimer S.A., a provider of nanometric deposition technology for through-silicon vias (TSVs), semiconductor interconnects and other electronic applications, announced that its Electrografting (eGTM) technology has been validated by scientists at RTI International (RTI).

RTI presented its research findings at the IEEE 3D System Integration Conference (3DIC) in Munich, Germany, confirming that electrografting is a proven technology for depositing “insulator, barrier and seedlayer into high aspect ratio TSVs for 3D integration applications.”

Electrografting is Alchimer’s proprietary electrochemical process that reportedly enables the growth of polymer and metal thin films. The company claims its deposition technology reduces overall cost of ownership for high-aspect-ratio TSV metallization by up to two-thirds compared to conventional dry processes, and shortens time to market.

The RTI study analyzed a variety of film properties, including leakage current, breakdown voltage, flat-band capacitance and voltage. It was found that “The eG films in particular had effective interface trap densities in the range of 1011 per cm2, which is an excellent result that is comparable to device-grade SiO2 and high-k gate dielectrics.”

Scientists in the Center for Materials and Electronic Technologies at RTI integrated electrografted layers in RTI test vehicles and exposed them to autoclave (AC) and high-temperature storage (HTS) reliability testing. The autoclave test was conducted during 96 hours under 121°C, 100 percent relative humidity and 2 bar absolute pressure. High-temperature storage was performed during 20 hours at 205°C.

“Both tests showed strong results with no significant difference in film performance before and after the tests,” said Claudio Truzzi, Alchimer’s chief technology officer. “Alchimer’s films have been vetted by multiple third parties and have been validated as conforming with several industry-standard, package-level reliability tests.”

Based in Research Triangle Park, N.C., USA, RTI International provides research and technical expertise to governments and businesses in more than 40 countries in the areas of health and pharmaceuticals, education and training, surveys and statistics, advanced technology, international development, economic and social policy, energy and the environment, and laboratory and chemistry services.

Francoise von Trapp

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