Porous thin-film-deposition substrate, electron emitting element, methods of producing them, and switching element and display element

1. A method of producing a porous thin-film-deposition substrate, comprising:

placing, onto a substrate that has an electrostatic charge on its surface, fine particles with a surface electrostatic charge opposite to the electrostatic charge of the substrate surface,

depositing a thin film, including at least one layer, on the fine-particle-placed substrate,

sticking an adhesive sheet on the fine-particle-placed substrate with the thin film deposited thereon, wherein an adhesive strength of the adhesive sheet is 0.1 N/cm to 5 N/cm, and then

peeling the adhesive sheet for removing the fine particles to form fine pores in the thin film on the substrate.

2. The method of producing a porous thin-film-deposition substrate according to claim 1 , comprising heating to soften the fine particles for adhering and fixing the particles on the substrate.

3. The method of producing a porous thin-film-deposition substrate according to claim 1 , wherein the fine particles are polymer fine particles.

4. The method of producing a porous thin-film-deposition substrate according to claim 1 , wherein an average opening diameter of the pores of the thin film is 1 nm to 10 μm.

5. The method of producing a porous thin-film-deposition substrate according to claim 1 , wherein the surface of the substrate is modified by a surface modifier.

6. A porous thin-film-deposition substrate produced in accordance with the method of claim 1 .

7. A switching element, comprising: the porous thin-film-deposition substrate of claim 6 , and another thin film formed on the porous thin-film-deposition substrate.

8. The switching element according to claim 7 , wherein at least one layer of the thin films is a layer of an organic charge-transferable material.

9. The method of producing a porous thin-film-deposition substrate according to claim 1 , wherein an adhesive plane of the adhesive sheet is smooth.

10. The method of producing a porous thin-film-deposition substrate according to claim 1 , wherein the adhesive sheet is flexible.

11. The method of producing a porous thin-film-deposition substrate according to claim 1 , wherein the thin film contains at least one organic semiconductor layer.

12. A method of producing an electron emitting element, comprising:

adding a catalyst metal on a substrate,

placing fine particles onto the catalyst-added substrate,

depositing a thin film, including at least one layer, on the fine-particle-placed substrate, then

removing the fine particles to form fine pores in the film, and

growing needle-shaped conductors as an aggregate thereof on the catalyst metal that is exposed on a bottom face of the fine pore.

13. The method of producing an electron emitting element according to claim 12 , wherein an average opening diameter of the fine pores is 1 nm to 10 μm.

14. The method of producing an electron emitting element according to claim 12 , wherein the coefficient of variation of the opening ratio of the fine pores is 50% or less.

15. The method of producing an electron emitting element according to claim 12 , wherein at least one electrode layer is formed under the catalyst metal.

16. The method of producing an electron emitting element according to claim 12 , wherein an insulation layer and an electrode layer are included in the thin film.

17. The method of producing an electron emitting element according to claim 12 , wherein a dipping adsorption method is used to provide the fine particles onto the substrate.

18. The method of producing an electron emitting element according to claim 12 , wherein the needle-shaped conductor is a whisker obtained by growing carbon nanotubes.

19. A display element, comprising the electron emitting element produced in accordance with the method of claim 12 .

20. An electron emitting element, comprising:

a substrate with at least one layer of a base film formed thereon,

another thin film layer, formed on the base film, having fine pores arranged substantially at an equal interval, and

an aggregate of needle-shaped conductors formed on each bottom face of the fine pores;

wherein the fine pores of the film layer are formed by removing fine particles from the substrate, in that the fine particles are once placed onto the surface of the base film on the substrate in accordance with a dipping adsorption method, and then the film layer is deposited on the fine-particle-placed substrate;

the electron emitting element further comprising a catalyst metal to be exposed at the bottom face of the fine pores after the fine particles are removed, and needle-shaped conductors grown on the catalyst metal.

21. The electron emitting element according to claim 20 , wherein the base film includes:

an electrode layer sharing its surface to be the bottom face of the fine pores, or

an electrode layer under a layer sharing its surface to be said bottom face; and

an insulation layer positioned under the electrode layer.

22. The electron emitting element according to claim 20 , wherein an average opening diameter of the fine pores is 1 nm to 10 μm.

23. The electron emitting element according to claim 20 , wherein the needle-shaped conductor is made of a carbon nanotube.

24. A display element comprising the electron emitting element according to claim 20 .