“…The measurement of some of the properties of such diodes, such as peak inverse voltage, only confirms information on obtained on various layers and it can be seen that the agreement is quite reasonable. It is also clear that if either the diffusions are sufficiently shallow to approach step junctions or, alternatively, allowance is made for gradient (13), a more precise measurement of resistivity is obtained than by the threepoint probe method as the voltage breakdown depends to a greater extent on resistivity in the range considered here. Also, premature breakdown due to surface effects is much less likely than with the three-point probe.…”