Figure 2.

The highest potential over the p-well (5 µm > z > 3 µm). Approximate linearization of the horizontal potential profile over the p-well toward the center hole is designed by implanting Boron irons with three different masks and different implanting energies. The masks are shown at the bottom: p-well 1: a red square with a hexagonal hole; p-well 2: a moss green square with a square hole; and p-well 3: 4 brown triangles.