Three-terminal electrical bistable devices

A method for making a bistable device comprising the steps of:

• providing a bottom electrode;
• forming a layer of low conductivity organic material on said bottom electrode;
• forming an electrically conductive mixed layer on said layer of low conductivity material, said electrically conductive mixed layer comprising a low conductivity material and a sufficient amount of a high conductivity material such that said mixed layer is electrically conductive and wherein an electrically bistable interface is formed between said layer of low conductivity material and said electrically conductive mixed layer;
• forming a second layer of low conductivity material on said electrically conductive layer wherein a second electrically bistable interface is formed between said electrically conductive layer and said second layer of low conductivity material;
• and
• forming a top electrode on said second layer of low conductivity material.

A memory device comprising:

• an electrically conductive mixed layer comprising a first side and a second side, said mixed layer comprising an low conductivity material and a sufficient amount of a high conductivity material wherein said mixed layer is electrically conductive;
• a first layer of low conductivity material located on said first side of said mixed layer, said first layer of low conductivity material having a first electrode side;
• a second layer of low conductivity material located on said second side of said mixed layer, said second layer of low conductivity material having a second electrode side;
• a first interface located on the first side of said mixed layer where said first layer of low conductivity material and said mixed layer meet, said first interface being electrically convertible between a low resistance state and a high resistance state by application of an electrical voltage to said first interface,
• a second interface located on the second side of said mixed layer where said second layer of low conductivity material and said mixed layer meet, said second interface being electrically convertible between a low resistance state and a high resistance state by application of an electrical voltage to said second interface;
• a first electrode attached to said first layer of low conductivity material at said first electrode side;
• a second electrode attached to said second layer of low conductivity material at said second electrode side;
• a memory input element for applying a voltage to said first electrode, said second electrode and/or said electrically conductive mixed layer to convert said first interface and/or said second interfaces between said low electrical resistance state and said high electrical resistance state;
• and
• a memory readout element which provides and indication of whether said first interface and/or said second interface is in said low electrical resistance state or said high electrical resistance state.