In summary, we find it is possible to model the extent of diffusion during spike anneals with varying ramp rates by considering the full thermal cycle. These models allow the optimization of RTP ammealing cycles considering the trade-offs between junction depth and sheet resistance. For example, with 1050°C spike anneals, the active dose (and thus sheet conductivity) varies approximately linearly with junction depth. However, faster ramp rates allow the use of higher spike temperatures, with associated higher activation and reduced sheet resistance for the same junction depth.
Work at Bosten University and the University of Washington was supported by the Semiconductor Research Corporation. We would like to thank Eric Perozziello for details and discussion regarding their experimental results.