E-Beam Mask Writer is the primary mask writing technology using a focused electron beam to expose resist on mask blanks — the electron beam can be shaped into variable-sized rectangles (VSB — Variable Shaped Beam) to write the mask pattern with sub-nanometer placement accuracy.

VSB E-Beam Writer

• Beam Shaping: Two square apertures overlap to create a variable-sized rectangular beam — adjustable shot size.
• Shot Size: Typical shot sizes from 0.1 µm to 4 µm — larger shots for large features, smaller for fine details.
• Placement: Sub-nm beam placement accuracy — controlled by electrostatic correction and laser interferometry.
• Dose Control: Per-shot dose modulation for proximity effect correction — compensate for electron scattering.

Why It Matters

• Industry Standard: VSB e-beam writers (NuFlare, JEOL) are the workhorses of mask manufacturing.
• Write Time: Serial writing means write time scales with shot count — 10-24 hours for advanced masks.
• Resolution: <10nm resolution on mask (2.5nm on wafer at 4× reduction) — sufficient for current nodes.

E-Beam Mask Writer is the electron pencil for masks — using a precisely shaped electron beam to inscribe nanoscale patterns onto photomask blanks.