SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor device that is capable of retaining a storage content even under a state of no power supply during a storage retention period and has a novel configuration with no restraint on writing frequency.SOLUTION: The semiconductor device includes: a first transistor that has a first channel formation region with any other semiconductor material than oxide semiconductor; a second transistor that is above the first transistor and has a second channel formation region using oxide semiconductor material; and a capacitative element. Either of a second source electrode or a second drain electrode of the second transistor is electrically connected with one electrode of the capacitative element.