Switchable memory diode-a new memory device
View Patent ↗Systems and methodologies are provided for forming a diode component integral with a memory cell to facilitate programming arrays of memory cells created therefrom. Such a diode component can be part of a PN junction of memory cell having a passive and active layer with asymmetric semiconducting properties. Such an arrangement reduces a number of transistor-type voltage controls and associated power consumption, while enabling individual memory cell programming as part of a passive array. Moreover, the system provides for an efficient placement of memory cells on a wafer surface, and increases an amount of die space available for circuit design.
1. A memory cell comprising:
an active layer with a state changeable based on a migration of at least one of ions, electrons and holes therefrom when subject to at least one of an external electric field and light radiation, the state indicative of information content; and
a passive layer that facilitates supply of charges to the active layer, one of the active layer and the passive layer is composed of a P-type material and one of the active layer and the passive layer is composed of an N-type material such that combining the layers forms a diodic junction.
2. The memory cell of claim 1 , the active layer comprises material selected from at least one of: organic material, non-organic material, semivonducting material, and inclusion compounds.
3. The memory device of claim 2 , the active layer comprises molecular units with redox-active metals.
4. The memory device of claim 3 , the redox-active metals comprise at least one of: metallocenes complex and polypyridine metal complex.
5. The memory device of claim 2 , the active layer comprises at least one of: polyaniline, polythiophene, polypyrrole, polysilane, polystyrene, polyfuran, polyindole, polyazulene, polyphenylene, polypyridine, polybipyridine, polyphthalocyanine, polysexithiofene, poly(siliconoxohemiporphyrazine), poly(germaniumoxohemiporphyrazine), and poly(ethylenedioxythiophene).
6. The memory device of claim 1 , the active layer comprises at least one of: hydrocarbons; organic molecules with donor and acceptor properties, metallo-organic complexes; porphyrin, phthalocyanine, and hexadecafluoro phthalocyanine.
7. The memory device of claim 2 , the organic molecules with donor acceptor properties comprises at least one of: N-Ethylcarbazole, tetrathiotetracene, tetrathiofulvalene, tetracyanoquinodimethane, tetracyanoethylene, cloranol, and dinitro-n phenyl.
8. The memory device of claim 2 , the metallo-organic complexes are selected from the group of bisdiphenylglyoxime, bisorthophenylenediimine, and tetraaza-tetramethylannulene.
9. The memory device of claim 2 , the active layer comprises organic material selected from the group comprising of polyacetylene, polyphenylacetylene, polydiphenylacetylene, polyaniline, poly(p-phenylene vinylene), polythiophene, polyporphyrins, porphyrinic macrocycles, thiol derivatized polyporphyrins, polymetallocenes, polyferrocenes, polyphthalocyanines, polyvinylenes, and polystiroles.
10. The memory device of claim 2 , the active layer comprises material selected from the group comprising of electric dipole elements, polymer ferroelectrics clusters, non-organic ferro-electrics, salts, alkalis, acids, and water molecules.