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Imec to Demonstrate 2 Metal Layer Back-end-of-line for the 3nm Technology Node

Imec to Demonstrate 2 Metal Layer Back-end-of-line for the 3nm Technology Node

Enterprise & IT Jul 8,2019 0

This week, at its technology forum ITF USA 2019, imec presents a dual-damascene 21nm pitch test vehicle relevant for manufacturing the 3nm logic technology node.

With this test vehicle, a 30 percent improvement in resistance-capacitance product (RC) was obtained compared to previous generations, without impacting reliability. The need for implementing scaling boosters such as self-aligned vias and self-aligned blocks in 3nm and beyond interconnect technologies has been demonstrated.

While the dimensional scaling of traditional front-end technologies is expected to slow down, the back-end-of-line dimensions keep on scaling with ~0.7X to keep up with the required area scaling. For the 3nm logic technology node, M2 interconnect layers with metal pitches as tight as 21nm need to be manufactured while preserving the back-end-of-line’s performance. This implies a tight control of the RC delay, while maintaining good reliability.

Imec for the first time demonstrated a dual-damascene 21nm metal pitch test vehicle that is relevant for the 3nm technology node. The measured RC shows a 30 percent improvement compared to previous generations. The test vehicle also performs well in terms of reliability: no electromigration failures were observed after 530 hours at 330°C, and dielectric breakdown (TDDB) measurements demonstrated a time-to-failure >10 years at 100°C.

To pattern the M2 layer, a hybrid lithography approach was proposed, using 193nm immersion-based self-aligned quadrupole patterning (SAQP) for printing the lines and trenches, and extreme ultraviolet lithography (EUVL) for printing the block and via structures. The test vehicle implemented a barrier-less ruthenium (Ru) metallization scheme and an insulator with dielectric constant k = 3.0.

First results also demonstrate that the proposed interconnect technology can be improved by adding scaling boosters, including buried power rail, SuperVia, self-aligned blocks, fully self-aligned vias and double self-aligned blocks.<.p>

Tags: imec3nm
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