In this work, we present and compare two integration approaches to enable self-alignment of the block suitable for the 5- nm technology node. The first approach is exploring the insertion of a spin-on metal-based material to memorize the first block and act as an etch stop layer in the overall integration. The second approach is evaluating the self-aligned block technology employing widely used organic materials and well-known processes. The concept and the motivation are discussed considering the effects on design and mask count as well as the impact on process complexity and EPE budget. We show the integration schemes and discuss the requirements to enable self-alignment. We present the details of materials and processes selection to allow optimal selective etches and we demonstrate the proof of concept using a 16- nm half-pitch BEOL vehicle. Finally, a study on technology insertion and cost estimation is presented.
Frédéric Lazzarino, Nihar Mohanty, Yannick Feurprier, Lior Huli, Vinh Luong, Marc Demand, Stefan Decoster, Victor Vega Gonzalez, Julien Ryckaert, Ryan Ryoung Han Kim, Arindam Mallik, Philippe Leray, Chris Wilson, Jürgen Boemmels, Kaushik Kumar, Kathleen Nafus, Anton deVilliers, Jeffrey Smith, Carlos Fonseca, Julie Bannister, Steven Scheer, Zsolt Tokei, Daniele Piumi, and Kathy Barla, "Self-aligned block technology: a step toward further scaling," Proc. SPIE 10149, Advanced Etch Technology for Nanopatterning VI, 1014908 (Presented at SPIE Advanced Lithography: February 28, 2017; Published: 7 April 2017); https://doi.org/10.1117/12.2258028.
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