Can anyone guide me cleaning process of the glass substrate? And what should be the pre-deposition rate before deposition in Vacuum thermal evaporation?
I don't know why in my attached samples, there is no uniformity...
The cleaning process for the glass substrates can be done in the following steps if the detergent such as DECOM90 or other brand, is used.
1. The ratio of 1:3 for the detergent to DI water is mixed to make a solution in a container.
2. Blow away any dusts on the substrates using a notrogen gun;
3. The substrates holding in place into a holder are put into the above mentioned solution in the step 1;
4. Put all into an ultrosonic bath for 30 mins to remove any contaminants on the glass;
5. After that, put the substrates with the holder dipping into DI water for three times rinsing to remove any detergent residuals;
6. Drying the glass substrates to make sure no water left over;
7. Put into an oven at 110 degree C for an hour to obtain a complete set of cleaned substrates.
After cooling, the substrates can be used for coating films on.
Hope it helps.
Xuhua Wang actually we don't have oven. I used the following steps, can you please guide if this is correct or not??
1. Put bare glass into a holder and put the holder in Acetone and place them in ultrosonic bath for 10 minutes.
2. Then put the holder containing the glass in IPA solution and place them in ultrosonic bath for 10 minutes.
3. Then put the holder containing glass in DI water for 10 mins and dry it using nitrogen gun.
Dear Muhammad,
The method you used is very common in a small research laboratory for a few samples cleaning.
The issue is if you don't move your samples quickly from one solvent to another, some stains could leave on the substrates, which could be very difficult to remove at the final stage of the cleaning process.
Once you use DI water cleaning, you have to make sure there are no moisture or water molecules left on your substrates. The notrogen gun blowing is not enough to remove all water on the substrates. If you don't have an oven, you could use a hot plate to heat up your substrates. During this process, you make sure the surface of the hot plate is clean. You could use Aluminium foil to protect your glass substrates by putting them on a hot plate.
Hope it helps.
Very best
Xuhua
Xuhua Wang yeah I get your point. Thank you so much for helping.
Xuhua Wang please tell which glass surface I will use for coating after heating in hotplate?
Because one of the glass surface is facing aluminium foil and other is in open air.
Dear Muhammad
The processed films should be up and the back of the glass substrates should contact on the surface of a hot plate. In this way, your processed films can avoid cross-contamination and the damages due to the contact on the hot plate surface. Hope it is clear.
- Badges
- Science topic