Patent ID: 6946305

Claim:
A method for evaluating an amount of charge, the method comprising the steps of: (a) preparing an apparatus for evaluating an amount of charge, the apparatus comprising a semiconductor substrate having a first insulating film on an upper portion thereof, a substantially intrinsic undoped silicon layer provided on the first insulating film, p-type regions each surrounded by the undoped silicon layer and composed of silicon containing a p-type impurity , and a second insulating film provided over the undoped silicon layer and the p-type regions; (b) performing a specified process with respect to the apparatus for evaluating an amount of charge; (c) after the step (b) immersing the apparatus for evaluating an amount of charge in an etching solution and etching at least the p-type regions in accordance with a principle of anodization; and (d) calculating, from an amount of etching in each of the p-type regions, an amount of charge caused b the specified process in the apparatus for evaluating an amount of charge.