Date: Wed, 06 Oct 1999 11:34:03 -0400
Subject: Re: Sourcing Semiconductor samples
If you really want to make ohmic contact to semiconductors, it's easy. Use pure
indium. Using a solder dedicated to In only, melt blobs onto the sample. Put the
sample on a hot plate just above the melting point of In (use a thermometer! they
make hot plate thermometers!). Watch for the In to melt. Wait one minute and
remove the sample. You will have nice ohmic contacts. How do I know this? I used
to do QHE, FQHE, and ballistic transport for a living.
To get rid of assymmetry, use an AC signal. Lock-in amps are wonderful for this
sort of measurement.