Patent ID: 6867055

Claim:
A method of testing a level of ion implantation energy in ion implantation equipment, comprising: implanting first conductive ions to a first depth in a semiconductor substrate to form a first well of the first and conductive ions in the semiconductor substrate; implanting second conductive ions to a second depth, different from said first depth, in said semiconductor substrate to form a second well of the second conductive ions in the semiconductor substrate, the second conductive ions having a valence different from that of the first conductive ions, and the implanting of said first and second conductive ions being carried out at the same region of the substrate such that the first and second wells constitute a well within a well wherein the wells overlap beginning at a boundary within said substrate; subsequently measuring the sheet resistance of the semiconductor substrate; and correlating the value of the sheet resistance to the level of ion implantation energy used in said forming of the wells.