To perform electrical measurements on thin film devices, we always need ohmic metallic contact electrodes. The most commonly used metals are Au and Al. I would like to use carbon paste but I have not found adequate information on their suitability. How can I get ohmic contacts especially for metal-insulator/oxide-semiconductor structures?
I will appreciate any publications on the same.
Carbon paste when dried make good contact to the the insulators specially SiO2 .
In case of silicon dioxide the carbon atoms may be partly bound to the oxygen.
In case of depositing metals on insulators there is no sense to speak from the ohmic contact as the insulator is the dominant material in the process of transport. In fact you can use any paste as long as it is conducting.
Best wishes
Carbon paste provides electrical contact, but with a contact resistance which may be too high for your application. It is far better using silver paint in this case. Let it dry for a long time (24H) for being totally sure that all solvent evaporated. Otherwise, the contact resistance won't be low enough.
Alain
Carbon paste when dried make good contact to the the insulators specially SiO2 .
In case of silicon dioxide the carbon atoms may be partly bound to the oxygen.
In case of depositing metals on insulators there is no sense to speak from the ohmic contact as the insulator is the dominant material in the process of transport. In fact you can use any paste as long as it is conducting.
Best wishes
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