Charge transfer apparatus and manufacture method thereof

Abstract

There is disclosed a charge transfer apparatus in which with respect to a signal charge detector, a gate insulation film under an output electrode and a reset electrode is formed of one layer of a silicon oxide film. As a result, even when the device is charged up during a manufacture process, the charge injection to the gate insulation film under the output electrode and reset electrode can be prevented. Therefore, the threshold value dispersion of the output electrode or the reset electrode is suppressed, and the charge transfer apparatus with uniform characteristics can be provided. Furthermore, by forming the silicon oxide film under the output electrode and reset electrode to be thick, the capacity formed of a floating diffusion layer and the parasitic capacity of the output electrode, and the capacity formed of the floating diffusion layer and the parasitic capacity of the reset electrode are reduced. Since the detection capacity formed of the floating diffusion layer is reduced, the charge/voltage conversion efficiency of the signal charge detector of the charge transfer apparatus, that is, a detection sensitivity can be increased.

Dependencies are inferred from the claim text.