Al thermal evaporation

Hi All

I want to do thermal evaporation of Al with a thickness of ~ 300 nm and encounter a problem. It is corrosive at high temperature and damage the boat easily. Also, molten Al tend to travel around the boat and cause short circuit between electrodes.

Since we do not have the capability of modifying source feeding mechanism. Is there any way we can improve on the boat? Like additional coating or wetting additives to confine the molten Al. Please give us any suggestion that could be helpful. Thank you very much for your help!

Hungtao