Patent ID: 7382003
Filing Date: 2008-06-03
Classification: H01L

Abstract:
1. A solid-state image pick-up unit comprising: a semiconductor substrate comprising an area in which a photoelectric converting portion is formed; and an electric charge transfer portion that transfers an electric charge formed in the photoelectric converting portion, the electric charge transfer portion being formed in the semiconductor substrate, wherein an electric charge transfer electrode for the electric charge transfer portion comprises a first layer electrode and a second layer electrode, the second layer electrode is formed to partially overlap with the first layer electrode when viewed from a vertical direction to the surface of the semiconductor substrate so that the second layer electrode is formed on a surface of the semiconductor substrate, a sidewall of the first layer electrode and only a portion of a top surface of the first layer electrode, leaving exposed the remaining portion of the top surface of the first layer electrode and a sidewall of the first layer electrode that is opposed to the sidewall of the first layer electrode on which the second layer electrode is formed, a gate oxide film is formed under the first layer electrode and the second layer electrode, the gate oxide film under the second layer electrode comprises a lamination structure (ONO) film which comprises: the gate oxide film under the first layer electrode also comprises a lamination structure (ONO) and covers a surface portion, other than that exposed from the second layer electrode, the ONO film under the first layer electrode includes: the ONO film under the second layer electrode is extended from a region under the second layer electrode that is on the semiconductor substrate to a region between the first layer electrode and the second layer electrode and over which the second layer electrode is formed on the first layer electrode, so as to cover whole of the regions and leaving exposed the remaining portion of the top surface of the first layer electrode and the sidewall of the first layer electrode that is opposed to the sidewall of the first layer electrode on which the second layer electrode is formed, and the bottom oxide film of the ONO film under the second layer electrode that is extended contacts a side of the ONO film formed under the first layer electrode, separating the silicon nitride film of the ONO film under the second layer electrode that is extended from the silicon nitride film of the ONO film under the first layer electrode.