Patent ID: 6144040
Filing Date: 2000-11-07
Classification: G01R,H01L

Abstract:
A van der Pauw semiconductor test structure for testing a resistivity of a doped area formed within a semiconductor wafer, comprising:a first primary tub doped with a first-type dopant and formed within a substrate of the semiconductor wafer that is doped with a second-type dopant having a polarity opposite that of the first-type dopant;at least four secondary tubs each doped with the first-type dopant and partially overlapping the primary tub to connect each of the secondary tubs to the first primary tub, each of the secondary tubs including an inner isolation structure and a first diffusion region doped with the first-type dopant and a second diffusion region doped with the second-type dopant, the inner isolation structure electrically isolating the first diffusion region from the second diffusion region, each of the first diffusion regions having a first contact connected thereto and each of the second diffusion regions having a second contact connected thereto;a second primary tub doped with the second-type dopant and located adjacent the first primary tub; andan outer isolation structure covering a substantial portion of the substrate and partially extending inside the primary tub and each of the secondary tubs, the outer isolation structure isolating the second diffusion region from the second primary tub.