Patent ID: 8889490
Filing Date: 2014-11-18
Classification: H01L

Abstract:
1. A method for manufacturing a memory device, comprising: forming a first impurity region and a second impurity region in a semiconductor film over an insulated surface; forming an insulating film over the semiconductor film; forming a first opening portion in the insulating film and a second opening portion in the insulating film; forming a first conductive film functioning as a first source or drain electrode directly connected to the first impurity region at the first opening portion and functioning as a lower electrode; forming a second conductive film functioning as a second source or drain electrode directly connected to the second impurity region at the second opening portion; forming an insulator over the first conductive film and the second conductive film; and forming an upper electrode over the insulator, wherein a first overlapped portion of the first conductive film, the insulator, and the upper electrode is formed in the first opening portion, wherein a second overlapped portion of the second conductive film, the insulator, and the upper electrode is formed in the second opening portion, and wherein a property of the insulator is changed by an optical effect or a thermal effect so as to short-circuit the lower electrode and the upper electrode.