Electrical characteristics of an anisotropic semiconductor sample of circular shape with finite contacts

摘要

The circular anisotropic Van der Pauw configuration with four equal finite edge contacts, symmetrical in respect of two orthogonal axes, is analyzed. Applying Schwarz‐Christoffel transformations, the potential problem of this structure is solved. The numerical calculations have been reduced to those of regular definite integrals. Furthermore, simple approximative formulae have been found, which describe the electrical characteristics of the structure. It is shown that a pocket calculator is sufficient for determining specific resistivities ρ1 and ρ2 from measurements.