Stage 1:
The by far simplest superconducting thin film process we can be able to do in Mor Di, depositing Nb and SiO2 could be preformed in two of our 3 E-Beam Crucibles,
To make things dead simple:
- Lithography:
- Nah, PL needs photoresist, etching and exposure.
- Solution: Use Made-in-Jaina- laser cut PCB stencils. Extremely cheap, readily available and
- Issues: while the Terrible mask alignment can be helped, we're talking >100um feature size. Extremely shitty, but cheap and 'eh'y enough for now.
- Deposition: All preformed with E-Beam system in mor di.
- All materials in question are easily deposited with an electron beam
- Substrate movement only required for
This is a proof of concept that we at OV can not only do basic deposition, but microcircuit fabrication and superconductor experimentation. I (HT) do not know of any simpler process we might use to accomplish this, the costs involved are minimal and virtually no additional equipment is required.
It will however be potato-quality and cause nanolab engineers to roll of their chairs laughing.
Stage 2:
Proper lithography, process control and maybe NbN- sputtering to better layer adhesion and superconducting properties.
Will probably need to access nanolab and have some backing from Timini Labs or a technician, but not an unrealistic step up.
Stage 3: Maybe own lithography and reactive ion beam etching?
Materials:
Stage 1: Shitty and bad:
- Nb Pellets, €102.00 for 50g from kjlc: https://www.lesker.com/newweb/deposition_materials/depositionmaterials_evaporationmaterials_1.cfm?pgid=nb1
- SiO2 Pellets, €28 for 100g from kjlc: https://www.lesker.com/newweb/deposition_materials/depositionmaterials_evaporationmaterials_1.cfm?pgid=si2
- >2 Pyrolytic Carbon Crucibles, ~€200 from kjlc: https://www.lesker.com/newweb/evaporation_sources/ebeam_crucibles_fabmate.cfm?pgid=0
Stage 2: Better, photolithography from nanolab?
- CF4 (R13
Stage 3: Sputtered NbN and maybe own lithography?
- CF4 (R13
Gear:
Method for preparing soldered pad connections to Nb- Pads with indium solder & Low temp soldering iron: