An integrated circuit device may include the following elements: a first semiconductor substrate; a first transistor set positioned in the first semiconductor substrate; a first dielectric layer covering a gate electrode of the first transistor set; a first interconnect member positioned in the first dielectric layer and electrically connected to the first transistor set; a second semiconductor substrate; a second transistor set positioned in the second semiconductor substrate and structurally different from the first transistor set; a second dielectric layer connected to the first dielectric layer, positioned between the first dielectric layer and the second semiconductor substrate, and covering a gate electrode of the second transistor set; and a second interconnect member positioned in the second dielectric layer, electrically connected to a terminal of the second transistor set, and electrically connected to the first interconnect member.