Hi Shuyun

The p-well and the n-well will need around 12 hours of diffusion each. How does the diffusion machine work? Is there a timer after which the furnace will reduce the heat and slowly cools the wafer down and then goes into standby until I take the wafer out? If yes: Do you think it is possible that I just come there in the evening, put the wafer in and come back the next morning, taking it out?

I've reduced the time for the p-well to 3 hours by reducing the depth of the well. Now I only have got the n-well left, which needs to be diffused for 12 hours. So still the question: Can I put the wafer into the diffusion chamber over night?

Cheers David