Atomic Level Processing (ALP) is the manufacturing paradigm that combines atomic layer deposition (ALD) and atomic layer etching (ALE) to build and shape semiconductor structures with single-atomic-layer precision — representing the fundamental process control methodology required at sub-3nm technology nodes where device dimensions are measured in tens of atoms.
ALP = ALD + ALE
- ALD (Atomic Layer Deposition): Self-limiting deposition — adds material one atomic layer at a time (~0.5-1.5 Å/cycle).
- ALE (Atomic Layer Etching): Self-limiting removal — removes material one atomic layer at a time (~0.3-0.5 Å/cycle).
- Combination: Build up, trim down, reshape — all with angstrom precision.
Why Atomic Precision Matters
| Node | Gate Length | Channel Thickness | Atoms Across |
|---|---|---|---|
| 7nm | ~16 nm | 7-8 nm | ~30 Si atoms |
| 3nm | ~12 nm | 5-6 nm | ~22 Si atoms |
| 2nm | ~10 nm | 4-5 nm | ~18 Si atoms |
| Sub-2nm | ~8 nm | 3-4 nm | ~15 Si atoms |
- Removing or adding 1 atomic layer changes structure by 5-7% at 2nm node.
- Sub-angstrom process control is not optional — it determines yield.
ALP Applications in Advanced CMOS
Gate Stack:
- ALD HfO2 gate dielectric: 1.5-2.0 nm (3-4 monolayers). Each monolayer matters for EOT and leakage.
- ALD TiN work function metal: Thickness controls Vt to ± 5 mV.
Nanosheet Fabrication:
- ALE: Precisely thin Si channels to target thickness (± 1 monolayer).
- ALD: Conformally wrap gate dielectric and metal around released nanosheets.
- ALE: Create inner spacer recesses with atomic-level depth control.
Patterning:
- ALD spacer deposition: Defines sub-litho features via spacer pitch.
- ALE resist trimming: CD adjustment with sub-nm precision.
- ALD + ALE cycles: Iterative shaping of 3D features.
ALP Cycle Budget
- Typical ALD: 1-2 Å per cycle, 100-300 cycles per deposition = 10-60 nm film.
- Throughput concern: Each cycle takes 2-10 seconds → 300 cycles = 10-50 minutes per wafer.
- Multi-wafer batch ALD (ASM, TEL) processes 25-100 wafers simultaneously to maintain fab throughput.
ALP Tool Ecosystem
- ALD tools: ASM (Pulsar/EmerALD), Tokyo Electron (NT333), Lam (ALTUS).
- ALE tools: Lam (Flex), Tokyo Electron (Tactras), Oxford Instruments.
- Hybrid ALD/ALE chambers: Same chamber performs both deposit and etch — reduces cycle time.
Atomic level processing is the manufacturing foundation of the sub-3nm transistor era — the ability to add and remove material with single-atom precision across a 300mm wafer with production throughput is what distinguishes a research demonstration from a billion-dollar production technology.
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