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Imec Introduces Self-assembled Monomolecular Organic Films to Seal Ultra-porous Low- K Materials - Method prevents leakage of barrier precursors during the interconnect metallization scheme - imec.be
Imec Introduces Self-assembled Monomolecular Organic Films to Seal Ultra-porous Low- K Materials

 

NewswireToday - /newswire/ - San Francisco, CA, United States, 2015/07/14 - Method prevents leakage of barrier precursors during the interconnect metallization scheme - imec.be.

   
 
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Nano-electronics research center imec announced today at SEMICON West that it has demonstrated concept and feasibility for pore-sealing low-k dielectrics in advanced interconnects. The method, based on the self-assembly of an organic monolayer, paves the way to scaling interconnects beyond N5.

The need for ultra-porous low-k materials as interconnect dielectrics to meet the requirements dictated by the ITRS (International Technology Roadmap for Semiconductors) poses several challenges for successful IC integration. One of the most critical issues is the indiffusion of moisture, ALD/CVD metal barrier precursors and Cu atoms into the porous low-k materials during processing (low-k pore diameter larger than 3nm, up to 40% porosity). This leads to a dramatic increase of the material dielectric constant and leakage current, and to the reduction of the voltage for dielectric breakdown.

Imec has developed a method to seal the pores of the low-k material with a monomolecular organic film. The method not only prevents diffusion of moisture and metal precursors into the low-k material, it also might provide an effective barrier to confine copper within the copper wires and prevent copper diffusion into the low-k material.

Self-assembled monolayers (SAMs) derived from silane precursors, are deposited from vapor phase on 300mm wafers into low-k during chemical vapor or atomic layer deposition and subsequent Cu metallization. The dielectric constant (k) of the resulting sealing layer is 3.5 and a thickness lower than 1.5nm was achieved. This is key to limit the RC delay increase enabling beyond 5nm technology nodes. As a result, a ca. 30% capacitance reduction was observed after SAM pore-sealing was applied. Moreover, a clear positive impact on the low-k breakdown voltage is observed upon sealing.

Imec’s research into advanced interconnects includes key partners as GLOBALFOUNDRIES, INTEL, Micron, Panasonic, Samsung, SK Hynix, Sony, and TSMC.

About imec
Imec (imec.be) performs world-leading research in nanoelectronics. Imec leverages its scientific knowledge with the innovative power of its global partnerships in ICT, healthcare and energy. Imec delivers industry-relevant technology solutions. In a unique high-tech environment, its international top talent is committed to providing the building blocks for a better life in a sustainable society. Imec is headquartered in Leuven, Belgium, and has offices in the Netherlands, Taiwan, USA, China, India and Japan. Its staff of about 2,200 people includes almost 700 industrial residents and guest researchers. In 2014, imec's revenue (P&L) totaled 363 million euro. Further information on imec can be found at imec.be. Stay up to date about what’s happening at imec with the monthly imec magazine, available for tablets and smartphones (as an app for iOS and Android), or via the website imec.be/imecmagazine
Imec is a registered trademark for the activities of IMEC International (a legal entity set up under Belgian law as a "stichting van openbaar nut”), imec Belgium (IMEC vzw supported by the Flemish Government), imec the Netherlands (Stichting IMEC Nederland, part of Holst Centre which is supported by the Dutch Government), imec Taiwan (IMEC Taiwan Co.)and imec China (IMEC Microelectronics (Shanghai) Co. Ltd.) and imec India (Imec India Private Limited).

 
 
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Imec Introduces Self-assembled Monomolecular Organic Films to Seal Ultra-porous Low- K Materials

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Imec | Self-assembled Monolayers
Publisher Contact: Hanne Degans - imec.be 
+32 16 28 17 69 / +32 486 06 51 75 (mobile) hanne.degans[.]imec.be
 
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