Semiconductor device, method of manufacturing a semiconductor device, solid-state imaging device, and electronic apparatus

A semiconductor device, comprising:

• a semiconductor element disposed on a back surface side of a semiconductor substrate, wherein the semiconductor element comprises a photoelectric conversion film sandwiched between two transparent electrodes, and wherein an insulating film is between the semiconductor element and the semiconductor substrate;
• a through-electrode that is provided through the semiconductor substrate in a depth direction of the semiconductor substrate and introduces charge obtained in the semiconductor element to a front surface side of the semiconductor substrate, wherein the through-electrode is composed of a conductor that penetrates the semiconductor substrate and a separation layer that electrically separates the conductor and the semiconductor substrate;
• and
• an amplifier transistor disposed on the front surface side of the semiconductor substrate that outputs an electrical signal based on the charge introduced by the through- electrode, the amplifier transistor using the through-electrode as a gate electrode and including a source region and a drain region around the through-electrode, wherein the gate electrode of the amplifier transistor is electrically connected to the semiconductor element via a wire.