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Sample mounting

Silicon wafers

For silicon wafers or similar samples heated by current passing through we clamp the sample directly to the electrical contacts.

It requires self-supporting sample of rectangular shape approximately 10 mm long and 3-10 mm wide. The best width is 5-7 mm. The suggested thickness is about 0.5 mm.

The electrical resistance should be in the range 0.1-1000 Ω depending on required temperature (in the case of silicon it means that it must be sufficiently doped). If the resistance is too high it is impossible to anneal the sample.

For annealing we usually use the 70 V×24 A power supply..

The centre of the sample is theoretically at half of the annealing voltage so it is difficult to acquire spectra during annealing.

The temperatures up to about 1100 °C/1400 K can be reached. Maximum annealing current is 10 A.

In the figure there is the sample holder with Si wafer 6×10 mm2 and the thermocouple mounted with Ta spacer in order to avoid migration of Ni on the sample.

Last Updated on Thursday, 25 March 2021 09:19