By Pete Singer, Editor-in-Chief
On Monday, imec – the Leuven Belgium-based research consortium – hosted its annual imec Technology Forum (ITF) USA, a half-day conference at the Marriott Marquis. With the theme ‘Towards the Ultimate System’, imec’s speakers and industrial keynote speakers looked at the co-optimization of design and new technology, and how technology innovation can deliver the right building blocks to build these systems.
Delivering the keynote address at the event was Luc Van den hove, President and CEO of imec. He talked about how the world was in the middle of a decade of digital disruption brought about by integrated circuit innovation. He then provided an outlook of how the industry could continue to stay on the path defined by Moore’s Law by moving to nanowires and the 3rd dimension.
Luc van den hove, president and CEO of imec, tipped his hat to Gordon Moore, showing a short video clip and describing a future where Moore’s Law will live on through 3D integration.
Van den hove noted what he said were obvious example of disruption today: Uber, the world’s largest taxi company that doesn’t own any taxis. Airbnb, the world’s largest accommodation provider that doesn’t own any real estate. Facebook, the world’s largest media provider, that doesn’t generate any media content.
“These are just a few examples, but we will see this kind of disruption everywhere, in every market and every segment,” he said. “Companies will have to adapt. They will have to reposition themselves in the value chain and come up with new business models. This is just the beginning.”
What’s made this disruption possible is IC technology and ubiquitous mobile computing. What’s been particularly beneficial over the last 50 years is that, in addition to the increased functionality that comes with scaling, there were advantages of faster operation at lower power. “This combination of effects that occurs simultaneously with scaling has resulted in the phenomenal evolution,” he said.
After a short video clip of Gordon Moore talking about the benefits of microprocessors, Van den hove give a realistic view of the future.
“Today, there is a lot of debate about the continuity of Moore’s Law. Yes, we’re faced with several tradeoffs. It’s getting harder and harder (to scale) and when we scale down our transistors we do not automatically the performance improvement that we used to with previous generations,” he said. “But we are sure there are sufficient solutions out there that will allow us to continue Moore’s legacy for several more decades. I am convinced that scaling will not only continue, it has to continue. If you want to enable the IoT wave, we will have to succeed in extending Moore’s law to generate the required compute power and storage capacity.”
Van den hove added that Moore’s Law is on the verge of morphing. “We will need other techniques in order to realize this complexity increase,” he said. “We will continue 2D scaling. It will evolve from the FinFET that is in mass production today towards horizontal nanowires, towards most likely vertical nanowires. This will bring us to at least the 3nm generation if not one or two generations more. This will keep us busy for the next 10-15 years.”
He stood by his past comments on the production-worth status of EUV. “To enable this, we will need a cost-effective lithography. We absolutely need EUV lithography to make this happen. I’m sure, based on the progress I’ve seen over the last 12 months, that EUV is ready to enter manufacturing. But we have to be realistic. Eventually, 2D scaling will slow down. I’m not saying it’s going to stop. But it’s getting harder and harder and hence it will require more time to transition from one geometry-based node to the next geometry node. We will need other ways to compensate for this gradual slowdown. One of the obvious ways to do so is to start using more extensively the third dimension, as the memory guys have started to do already,” he said.
Van den hove presented a future where devices are stacked on top of one another like Lego blocks. “Once we are using these vertical nanowires, it’s not so difficult to imagine that we may be stacking those transistors on top of each other – stack an n-FET on top of a p-FET and realize an SRAM cell. It’s obvious that such a 3D version of an SRAM cell has a much smaller footprint than its 2D equivalent. Once we can do that, we can even imagine that we may start stacking some of these building blocks on top of each other,” he said.
“It’s more straightforward to imagine that this can be done with a regular structure such as an SRAM design, but also FPGAs are very regular structures. We can even imagine that we could design random logic and design standard cells within the constraints of such a 3D Lego block and build up a logic circuit with these Lego blocks in a 3D fabric,” he continued.
Heterogeneous integration with photonics is also on the drawing board. “We will combine this also with 3D heterogeneous integration where we will be using chip stacking technology with high bandwidth, high density through silicon vias. We can then combine all these layers with 3D stacking and through-silicon vias, integrate all of this on an interposer, which can also be the substrate to integrate these 3D cubes,” he said. “By adding also photonics on such an interposer, we can also realize optical IOs. This is just another rendition of Moore’s Law which will allow more complexity in a smaller form factor.”