US Patent 9799685 Semiconductor device

Provided is a semiconductor device suitable for miniaturization and higher density. The semiconductor device includes a first transistor, a second transistor overlapping with the first transistor, a capacitor overlapping with the second transistor, and a first wiring electrically connected to the capacitor. The first wiring includes a region overlapping with an electrode of the second transistor. The first transistor, the second transistor, and the capacitor are electrically connected to one another. A channel of the first transistor includes a single crystal semiconductor. A channel of the second transistor includes an oxide semiconductor.