Heidelberg DWL 66+ Laser Writer
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| Tool Name | Heidelberg DWL 66+ Laser Writer |
|---|---|
| Instrument Type | Lithography |
| Staff Manager | Ana Cohen |
| Lab Location | Bay 2 |
| Tool Manufacturer | Heidelberg |
| Tool Model | DWL 66+ |
| NEMO Designation | LW-01 |
| Lab Phone | 8-9799 |
| SOP Link | SOP |
Description
The fully automated DWL 66+ laser writing system is located inside an environment chamber for stable environment of the system with controlled laminar airflow and temperature stability. The chamber is situated on a granite base with air cushions for vibration isolation. The optical system includes highly reflective mirrors and acousto-optic modulators for real-time beam correction. The laser is 405nm wavelength (h-line).
Lens & Resolution
- 2 mm lens (optical autofocus): 600 nm
- 10 mm lens (pneumatic autofocus): 2 µm
- 40 mm lens (pneumatic autofocus): 10 µm
Applications
- Patterning of photomasks
- Direct laser writing on substrates, from 6" wafers down to 10mm x 10mm pieces
Allowed Materials
- Mask Plates -- available in the QNF Stockroom pre-coated with AZ1500 and IP3500
- Resists -- must be compatible with h-line exposure
Processes
The following exposure parameters may be used to expose photomasks. (Updated Feb 15, 2024)
| Resist | Write Head | Filter(s) | Laser Power (mW) | Intensity | Focus | # of passes | Focus mode |
|---|---|---|---|---|---|---|---|
| AZ1500 | 10mm | 25% | 60 | 70% | +20 | 1 | Pneumatic |
| IP3500 | 10mm | NONE | 60 | 70% | +20 | 1 | Pneumatic |
| IP3500 | 2mm | 25% & 12.5% | 60 | 50% | 0 | 1 | Pneumatic |
The following exposure parameters may be used to direct write into S18xx resist on silicon (soft baked at 115C for 60s, development in TMAH 0.26N for 60s). For the optimum focus, please refer to the "AZ1500.txt" or "IP3500.txt" files for the optimum value to use. [May not be up-to-date. It is always a good idea to check your resist thickness and run a dose test to confirm optimal parameters.]
| Resist | Spin Speed (RPM) | Write Head | Filter(s) | Laser Power (mW) | Intensity | # passes | Focus mode |
|---|---|---|---|---|---|---|---|
| S1805 | 3000 | 10mm | 12.5% | 105 | 70% | 1 | pneumatic |
| S1805 | 3000 | 2mm | 1% & 50% | 105 | 100% | 1 | pneumatic |
| KL5315 | 5000 | 10mm | 50% | 105 | 40% | 1 | pneumatic |
| KL5315 | 5000 | 2mm | 1% | 75 | 100% | 1 | pneumatic |
| S1818 | 3000 | 10mm | NONE | 65 | 70% | 1 | pneumatic |
| S1818 | 3000 | 2mm | 12.5% & 25% | 60 | 60% | 1 | pneumatic |
S1818 at 3000rpm (2.2um thickness) with 10mm writehead [Feb 2024] 65mW, NO Filter, 70% intensity, + 20 focus 5um, 10um, 25um, and 50um line widths after 60s TMAH 0.26N development
