3-D molecular assembly and its applications for molecular display and moletronics

• US 7,782,408 B2
• Filed: 07/07/2003
• Issued: 08/24/2010
• Est. Priority Date: 07/07/2003
• Status: Expired due to Fees

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Zhang, Xiao-An, Zhou, Zhang-Lin, Leung, Sui-Hing, Vincent, Kent D.
• Primary Examiner(s): RUDE, TIMOTHY L
• Application Number:
  US10/614,855
• Publication Number:
  US 20050008321A1
• Time in Patent Office: 2,605 Days
• Field of Search: 349/58
• US Class Current: 349/1
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: G02F 1/1516 comprising organic material
• CPC Class Codes: G02F 1/174 based on absorption band-shift, e.g. Stark - or Franz-Keldysh effect G02F1/015, G02F1/178 take precedence
• CPC Class Codes: H10K 10/701 Organic molecular electronic devices
• CPC Class Codes: H10K 85/10 Organic polymers or oligomers
• CPC Class Codes: H10K 85/111 comprising aromatic, heteroaromatic, or aryl chains, e.g. polyaniline, polyphenylene or polyphenylene vinylene
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/649 Aromatic compounds comprising a hetero atom
• CPC Class Codes: H10K 85/701 Langmuir Blodgett films

Abstract

A three-dimensional molecular assembly and method of formation are provided. The molecular assembly is formed on a substrate. The molecular assembly comprises: a first monolayer of seed molecules for initiating self-assembled molecular growth, the first monolayer formed on the substrate; a second monolayer of active molecules comprising a plurality of rotor and stator moieties, with one rotor moiety supported between two stator moieties, the second monolayer of active molecules formed on the first monolayer of seed molecules, with a one-to-one correspondence between molecules in the first monolayer and the second monolayer; a third monolayer of spacer molecules, formed on the second monolayer of active molecules, with a one-to-one correspondence between molecules in the second monolayer and the third monolayer; and a plurality of alternating second monolayers and third monolayers having the one-to-one correspondence.

Claims

1. A three-dimensional molecular switch assembly, formed on a substrate, said molecular switch assembly comprising:

a first monolayer of seed molecules for initiating self-assembled molecular growth, said first monolayer formed on said substrate;

a second monolayer of active molecules comprising a plurality of rotor moieties and stator moieties, with one rotor moiety supported between two stator moieties, said second monolayer of active molecules formed on said first monolayer of seed molecules, with a one-to-one correspondence between molecules in said first monolayer and said second monolayer;

a third monolayer of spacer molecules, formed on said second monolayer of active molecules, with a one-to-one correspondence between molecules in said second monolayer and said third monolayer; and

a plurality of alternating second monolayers and third monolayers having said one-to-one correspondence,

wherein said active molecules are switchable between two different states by an applied external electric field.

2. The three-dimensional molecular switch assembly of claim 1 wherein said seed molecules comprise at least one connector portion and an interconnecting portion.

3. The three-dimensional molecular switch assembly of claim 2 wherein said seed molecules comprise two asymmetric connector portions, on opposite sides of said interconnecting portion.

4. The three-dimensional molecular switch assembly of claim 1 wherein said active molecules comprise said rotor moieties and said stator moieties, and at least one connector portion connected to at least one said stator moiety.

5. The three-dimensional molecular switch assembly of claim 4 wherein said active molecules comprise two connector portions connected to said at least one stator moiety, on opposite sides thereof to form a first connector portion and a second connector portion.

6. The three-dimensional molecular switch assembly of claim 5 wherein each said connector portion has at least one functional group thereon, which is the same for said first connector portions and said second connector portions.

7. The three-dimensional molecular switch assembly of claim 5 wherein said first connector portions each have at least one first functional group thereon, which is the same for all first connector portions and wherein said second connector portions each have at least one second functional group thereon, which is the same for all second connector portions, wherein said at least one first functional group is different than said at least one second functional group.

8. The three-dimensional molecular switch assembly of claim 4 wherein not all stator moieties have any said connector portions connected thereto.

9. The three-dimensional molecular switch assembly of claim 1 wherein said spacer molecules comprise at least one connector portion and an interconnecting portion.

10. The three-dimensional molecular switch assembly of claim 9 wherein said spacer molecules comprise two connector portions, on opposite sides of said interconnecting portion.

11. The three-dimensional molecular switch assembly of claim 10 wherein each said connector portion has at least one functional group thereon, which is the same for said first connector portions and said second connector portions.

12. The three-dimensional molecular switch assembly of claim 10 wherein said first connector portions each have at least one first functional group thereon, which is the same for all first connector portions and wherein said second connector portions each have at least one second functional group thereon, which is the same for all second connector portions, wherein said at least one first functional group is different than said at least one second functional group.

13. The three-dimensional molecular switch assembly of claim 1 wherein said substrate comprises a first electrode and wherein said molecular assembly further comprises a second electrode formed on an uppermost monolayer.

14. The three-dimensional molecular switch assembly of claim 13 wherein said third monolayer is formed on said first monolayer, said second monolayer is formed on said third monolayer, with subsequent alternating third monolayers and second monolayers, with said second electrode formed on said uppermost monolayer.

15. The three-dimensional molecular switch assembly of claim 13 wherein said seed layer is omitted, said second monolayer is formed directly on said first electrode, and said third monolayer is formed on said second monolayer, with subsequent alternating second monolayers and third monolayers, with said second electrode formed on said uppermost monolayer.

16. The three-dimensional molecular switch assembly of claim 13 wherein said seed layer is omitted, said third monolayer is formed directly on said first electrode, and said second monolayer is formed on said third monolayer, with subsequent alternating third monolayers and second monolayers, with said second electrode formed on said uppermost monolayer.

33. The three-dimensional molecular switch assembly of claim 1 as a bi-stable molecular color switch.

34. The three-dimensional molecular switch assembly of claim 33 wherein said bi-stable molecular color switch is switchable by an applied external electric field between a colored state and a transparent state.

35. The three-dimensional molecular switch assembly of claim 34 wherein color change occurs through a molecular conformation change that alters the degree of electron conjugation across a said active molecule and, thereby, the highest occupied molecular orbital—

lowest unoccupied molecular orbital states of said active molecule.

36. The three-dimensional molecular switch assembly of claim 1 as a bi-stable molecular switch.

17. A method for fabricating a three-dimensional switch molecular assembly, formed on a substrate, said method comprising:

forming on said substrate a first monolayer of seed molecules for initiating self-assembled molecular growth;

forming, via molecular self-assembly, on said first monolayer a second monolayer of active molecules comprising a plurality of rotor moieties and stator moieties, with one rotor moiety supported between two stator moieties, with a one-to-one correspondence between molecules in said first monolayer and said second monolayer;

forming, via molecular self-assembly, on said second monolayer a third monolayer of spacer molecules, with a one-to-one correspondence between molecules in said second monolayer and said third monolayer; and

forming, via molecular self-assembly, a plurality of alternating second monolayers and third monolayers having said one-to-one correspondence,

wherein said active molecules are switchable between two different states by an applied external electric field.

18. The method of claim 17 wherein said seed molecules comprise at least one connector portion and an interconnecting portion.

19. The method of claim 18 wherein said seed molecules comprise two asymmetric connector portions, on opposite sides of said interconnecting portion.

20. The method of claim 17 wherein said active molecules comprise said rotor moieties and said stator moieties, and at least one connector portion connected to at least one said stator moiety.

21. The method of claim 20 wherein said active molecules comprise two connector portions connected to said at least one stator moiety, on opposite sides thereof to form a first connector portion and a second connector portion.

22. The method of claim 21 wherein each said connector portion has at least one functional group thereon, which is the same for said first connector portions and said second connector portions.

23. The method of claim 21 wherein said first connector portions each have at least one first functional group thereon, which is the same for all first connector portions and wherein said second connector portions each have at least one second functional group thereon, which is the same for all second connector portions, wherein said at least one first functional group is different than said at least one second functional group.

24. The method of claim 20 wherein not all stator moieties have any said connector portions connected thereto.

25. The method of claim 17 wherein said spacer molecules comprise at least one connector portion and an interconnecting portion.

26. The method of claim 25 wherein said spacer molecules comprise two connector portions, on opposite sides of said interconnecting portion.

27. The method of claim 26 wherein each said connector portion has at least one functional group thereon, which is the same for said first connector portions and said second connector portions.

28. The method of claim 26 wherein said first connector portions each have at least one first functional group thereon, which is the same for all first connector portions and wherein said second connector portions each have at least one second functional group thereon, which is the same for all second connector portions, wherein said at least one first functional group is different than said at least one second functional group.

29. The method of claim 17 wherein said substrate comprises a first electrode and wherein said method further comprises forming a second electrode on an uppermost monolayer.

30. The method of claim 29 wherein said third monolayer is formed on said first monolayer, said second monolayer is formed on said third monolayer, with subsequent alternating third monolayers and second monolayers, with said second electrode formed on said uppermost monolayer.

31. The method of claim 29 wherein said seed layer is omitted, said second monolayer is formed directly on said first electrode, and said third monolayer is formed on said second monolayer, with subsequent alternating second monolayers and third monolayers, with said second electrode formed on said uppermost monolayer.

32. The method of claim 29 wherein said seed layer is omitted, said third monolayer is formed directly on said first electrode, and said second monolayer is formed on said third monolayer, with subsequent alternating third monolayers and second monolayers, with said second electrode formed on said uppermost monolayer.

37. The method of claim 17 wherein said three-dimensional molecular switch assembly is a bi-stable molecular color switch.

38. The method of claim 37 wherein said bi-stable molecular color switch is switchable by an applied external electric field between a colored state and a transparent state.

39. The method of claim 38 wherein color change occurs through a molecular conformation change that alters the degree of electron conjugation across a said active molecule and, thereby, the highest occupied molecular orbital—

lowest unoccupied molecular orbital states of said active molecule.

40. The method of claim 17 wherein said three-dimensional molecular switch assembly is a bi-stable molecular switch.