Patent ID: 8866117

Claim:
A semiconductor storage device comprising: a diode layer comprising a first impurity semiconductor layer and a second impurity semiconductor layer, the first impurity semiconductor layer containing a first impurity configured to act as an acceptor, the second impurity semiconductor layer containing a second impurity configured to act as a donor; a first electrode layer having a first end contacting the diode layer; a polysilicon layer having a first end contacting a second end of the first electrode layer and having a grain size smaller than a grain size of the diode layer; a variable resistance layer having a first end contacting a second end of the polysilicon layer, and configured to change a resistance value; and a second electrode layer contacting a second end of the variable resistance layer, at least one of a first area and a second area containing a third impurity, the first area including the first end of the polysilicon layer, the second area including the second end of the polysilicon layer, the third impurity being different from the first impurity and the second impurity.