© daniel schweinert dreamstime.com Business | March 26, 2013
Kick off for Copper Wire Bonding Consortium II
The Institute of Microelectronics (IME), a research institute of the Agency for Science, Technology and Research (A*STAR) in Singapore, has launched the Copper (Cu) Wire Bonding Consortium II.
The consortium which rides on the successes of Phase I launched in 2010 aims to improve the reliability of semiconductor devices by tackling copper wire bonding issues related to corrosion and stress. Members of this consortium span across the semiconductor supply chain including Atotech S.E.A., Globalfoundries, Heraeus Materials and Infineon Technologies. Copper, which offers favorable cost, performance, quality and reliability benefits over gold, has become one of the preferred materials for wire bonding interconnects in microelectronics. Today, however, the industry still faces many technical challenges in developing copper as the best choice for chip-to-package interconnection. One of the key technical issues is related to copper’s hardness relative to gold, which requires bonding parameters to be very well controlled in order to eliminate the risk of damaging bond pads and underlying structures. Another daunting challenge of using copper is its reactivity with oxygen in the surrounding air which causes corrosion-related problems. These two issues can affect the reliability and quality of semiconductor devices. Against this background, the IME Cu Wire Bonding Consortium II will conduct a study on corrosion and the mechanisms on the effect of various packaging materials. To understand the effects of copper wire hardness when bonding on different materials, the consortium will carry out modeling and characterization of copper wire bonding stress using stress sensors developed under the scope of Phase I of the Cu Wire Consortium to provide an improved technique of measuring wire bonding stress. The outcome of this work will enable semiconductor manufacturers as well as test and packaging houses to develop solutions to improve product reliability, especially those targeted at high reliability applications. "IME has been dominant in the R&D of advanced packaging technologies and remains focused on developing solutions to help the industry reduce manufacturing costs,” said Prof. Dim-Lee Kwong, Executive Director of IME. “We are excited to begin a new phase of the Cu Wire Bonding Consortium to enable the development of robust, high reliability and low cost interconnection solutions." ”Globalfoundries is pleased to be in this consortium as the first phase of our partnership has successfully resulted in optimizing 0.7 mil in copper wire bonding on our 40nm product and passed the JEDEC reliability test,” commented Mr. K. C. Ang, Senior Vice President and General Manager for Globalfoundries Singapore. “The success has brought us to the next phase of collaboration where the process will be tested on our advanced 28nm product. We see this industry collaboration truly augmenting the value proposition we have on offering quality and cost effective wafer manufacturing to our customers.” “Infineon has been part of the Copper Wire Bonding Consortium since it first launched in 2010,” said Mr. Guenter Mayer, Senior Director, Package Technology and Innovation, Infineon Technologies Asia Pacific. “Today, our interest lies in copper wire bond interconnect performance and reliability in semiconductors that can meet the stringent quality requirements of Automotive and Industrial applications.” “Being a member of the consortium enables Heraeus to work with strong industry partners and research institutes in order to have more in-depth understanding of wire bond reliability. The consortium members are of various backgrounds, such as wafer manufacturers, mold compound manufacturers and end users. The wafer manufacturers design pad structures that cater for the harder copper wire which created challenges on 1st bond mechanical stress during bonding and package reliability due to corrosion. Other partners are mold compound manufacturers and end users who can equally contribute to materials and assessment on best combination of package design, materials and application solution,” said Mr. Bernd Stenger, Executive Vice President, Contact Materials Division, Heraeus Materials Technology.
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