Patent ID: 11946890
Assignee: KLA CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A method for determining an electric property of a multilayer test sample comprising:
providing said multilayer test sample, wherein said multilayer test sample includes:
a bottom layer constituting a first electrical conducting or semiconducting layer;
an interface layer;
a top layer constituting a second electrical conducting or semiconducting layer, wherein said interface layer is arranged between said bottom layer and said top layer, wherein said interface layer has a smaller electrical conductivity than said bottom layer and said top layer; and wherein said interface layer has a thickness such that said interface layer substantially constitutes an ohmic conductor and such that electron transport through said interface layer by means of quantum tunneling is negligible compared to a total transport of electrons through said interface layer;

providing a microscopic multi point probe, said microscopic multi point probe having a set of contact probes for contacting said top layer;
contacting said top layer with said set of contact probes;
measuring a plurality of voltages or resistances for each of a plurality of spacings of contact probes, wherein a pair of contact probes are used for each resistance or voltage measurement;
providing a model for determining a resistance area product of said interface layer, wherein said model receives said plurality of voltages or resistances as input and returns said resistance area product as output; and
determining said resistance area product by means of said model.