Specific Process Knowledge/Etch/Etching of Gold
Etching of Gold
Etching of Gold is done wet at Danchip making your own set up in a beaker in the fumehood. We have two different solutions:
- Iodine etch: KI:IFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle _2} :HFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle _2} O - 100g:25g:500ml - standard at Danchip
- Aqua Regia (Kongevand): HNOFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle _3} :HCl - 1:3
Comparing the two solutions
| Iodine based gold etch | Aqua Regia (Kongevand) | |
|---|---|---|
| General description |
Etch of pure Gold |
Etch of pure Gold |
| Chemical solution | KJ:JFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle _2} :HFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle _2} O (100g:25g:500ml) | HCl:HNOFailed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle _3} (3:1) |
| Process temperature | 20 oC | 20 oC |
| Possible masking materials: |
Photoresist (1.5 µm AZ5214E) |
Unmasked - used as a stripper |
| Etch rate |
~100 nm/min |
~(??) nm/min - fast etch |
| Batch size |
1-25 wafers at a time |
1-25 wafer at a time |
| Size of substrate |
2-6" wafers |
2-6" wafers |