DRAM
Enabling the memory yield and process control that every AI accelerator depends on
- Planar
- 4F² Vertical
- 3D DRAM
DRAM is changing architectures.
The process complexity is following.
The transition from planar DRAM cells toward vertical channel designs is the biggest architectural shift the segment has seen in decades – and it is driving a step-change increase in the number of etch steps that require atomic-scale control.
AI accelerators are reshaping the economics of memory. Every larger model and faster training run pulls more high-bandwidth DRAM into the supply chain — and the very architectures that deliver that bandwidth are where conventional etch starts to lose its grip. Precision at the etch step is becoming a yield differentiator, not a footnote.
Where AAT Fits
For years, DRAM scaling was largely a dimensional shrink within a familiar architecture. That era is ending. As the industry moves toward 4F² vertical channel transistors and then to 3D DRAM, the process flow is beginning to resemble advanced logic in its complexity, with high-aspect-ratio structures, buried bitline formation, and capacitor trench profiles that demand etch precision far beyond what RIE can reliably deliver.
At the same time, HBM (High Bandwidth Memory) – the stacked memory inside AI accelerators – requires consistent yield across many layers, where within-wafer uniformity at the etch step directly affects device performance. AAT's real-time AI control loop maintains that uniformity automatically, across wafers and across lots.
- 01Planar
- 024F² Vertical Channel
- 033D DRAM
AAT's platform addresses the precision finishing steps in DRAM fabrication – capacitor top-electrode trim, gate recess uniformity, and the emerging high-aspect-ratio requirements that come with vertical channel architectures.
Demonstrated Performance
- Synergy Factor>90%
- Linearity (R²)>0.9997
- Cycle Time~2 seconds
- Synergy Factor>80%
- Linearity (R²)>0.9947
- Cycle Time~2 seconds
Source: SPIE Advanced Lithography + Patterning 2026, Paper 13984-24
The AAT Advantage
Precision at production throughput.
The architecture transition in DRAM means more ALE steps per wafer – but those steps still need to hit aggressive cycle time targets. At ~2 seconds per cycle, AAT makes that possible without sacrificing the process control the new architectures demand.
Algorithmic process control.
AAT's AI-native platform continuously optimizes gas flow, power, and timing in real time as an active part of how the tool runs. As DRAM process flows become more complex with each architecture generation, the ability to converge on a production-worthy recipe quickly becomes a meaningful competitive advantage.
The same tool, both modes.
The transition from bulk capacitor recess to precision surface finishing – and back again – is handled within the same chamber, switched algorithmically. No additional tooling required, no manual recipe intervention, as your process flow evolves.