Electrically addressable memory switch
View Patent ↗A novel switching device is provided with an active region arranged between first and second electrodes and including a molecular system and ionic complexes distributed in the system. A control electrode is provided for controlling an electric field applied to the active region, which switches between a high-impedance state and a low-impedance state when the electrical field having a predetermined polarity and intensity is applied for a predetermined time.
1. A switching device comprising:
a top electrode and a bottom electrode;
an active region positioned between the top and bottom electrodes, the active region comprises ionic complexes each containing at least one negatively charged Cl ion distributed in a molecular system; and
a control electrode that controls an electric field applied to the active region.
2. The switching device of claim 1 , each of the ionic complexes comprises at least one positively charged ion.
3. The switching device of claim 2 , the positively charged ions comprise at least one of Na ions and Cs ions.
4. The switching device of claim 3 , the active region has an on state and an off state.
5. The switching device of claim 4 , the electric field is controlled for switching the active region between the on state and the off state.
6. The switching device of claim 5 , in the on state, the electric field is controlled via a positive voltage applied between the control electrode and the top and bottom electrodes to make potential at the top electrode more positive with respect to potential at the bottom electrode.
7. The switching device of claim 6 , the ionic complexes are in a metastable dissociated configuration under the influence of the applied positive voltage.
8. The switching device of claim 7 , the metastable dissociated configuration corresponds to the on state of the active region.
9. The switching device of claim 8 , in the off state, the electric field is controlled via a negative voltage applied between the control electrode and the top and bottom electrodes to make potential at the top electrode less positive with respect to potential at the bottom electrode.
10. The switching device of claim 9 , the ionic complexes are in an associated configuration under the influence of the applied negative voltage.
11. The switching device of claim 1 , the molecular system comprises at least one of polyconjugated compounds, aromatic molecules, heterocyclic molecules, quasi one-dimensional compounds, and anisotropic inorganic materials.
12. The switching device of claim 11 , quasi-one-dimensional complexes comprise at least one of phthalocyanines and porphyrins.
13. The switching device of claim 11 , the anisotropic inorganic material comprises NbSe 3 .
14. The switching device of claim 1 , further comprising an insulating layer adjacent the control electrode.
15. The switching device of claim 14 , the insulating layer is positioned between the control electrode and the active region.
16. The switching device of claim 15 , further comprising a substrate.
17. The switching device of claim 16 , wherein the first and second electrodes are provided on the substrate.
18. The switching device of claim 17 , wherein the active region is provided on the substrate and has an electrical contact with the first and second electrodes.
19. A memory switch, comprising:
a gate terminal;
at least two signal terminals; and
an active region between the at least two signal terminals that has a molecular system comprising ionic complexes, each of which comprises at least one negatively charged Cl ion.
20. The memory switch of claim 19 , each ionic complex further comprises at least one positively charged ion.
21. The memory switch of claim 20 , the at least one positively charged ion is at least one of a Na ion and a Cs ion.
22. The memory switch of claim 21 , the ionic complexes are in a metastable dissociated configuration upon application of a voltage of a first polarity to the gate terminal.
23. The memory switch of claim 22 , the active region is in an on state when the ionic complexes are in the metastable dissociated configuration.
24. The memory switch of claim 21 , the ionic complexes revert to an associated configuration upon application of a voltage of a second polarity to the gate terminal, the second polarity is opposite to the first polarity.
25. The memory switch of claim 24 , the active region is in an off state when the ionic complexes are in the associated configuration.
26. A method for switching a device having a control terminal, two signal terminals, and an active region electrically connected between the signal terminals and having a molecular system with ionic complexes therein, comprising;
applying a voltage with a first polarity to the control terminal to cause dissociation of the ionic complexes to turn the device on; and
applying a voltage with a second polarity opposite to the first polarity to the control terminal to cause the ionic complexes to associate to turn the device off.
27. The method of claim 26 , each of the ionic complexes comprises at least one negatively charged Cl ion and at least one positively charged ion.
28. The method of claim 27 , the positively charged ion is at least one of a Na ion and a Cs ion.