EP0708473B1 - Procédé de fabrication d'une source d'électrons à micropointes - Google Patents
Procédé de fabrication d'une source d'électrons à micropointes Download PDFInfo
- Publication number
- EP0708473B1 EP0708473B1 EP95402312A EP95402312A EP0708473B1 EP 0708473 B1 EP0708473 B1 EP 0708473B1 EP 95402312 A EP95402312 A EP 95402312A EP 95402312 A EP95402312 A EP 95402312A EP 0708473 B1 EP0708473 B1 EP 0708473B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- lift
- electrically insulating
- deposition
- une
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/022—Manufacture of electrodes or electrode systems of cold cathodes
- H01J9/025—Manufacture of electrodes or electrode systems of cold cathodes of field emission cathodes
Definitions
- the present invention relates to a method of fabrication of a microtip electron source ("microtips").
- the invention applies to any field where is likely to use such an electron source to microtips, in particular the field of flat display also called "flat screens”.
- the invention makes it possible for example to manufacture large micropoint flat screens, the surface area of which can be of the order of 1000 cm 2 and can even go up to around 1 m 2 .
- document (1) describes a matrix point electron source with microtips and a method of manufacturing this source.
- Documents (2) to (4) relate to source improvements described in document (1).
- microtips are produced by a method vacuum evaporation.
- This method involves two steps.
- a first step is to evaporate, under grazing incidence, a sacrificial layer ("lift off layer "in articles in the English language), for example nickel.
- this layer 12 under incidence grazing allows to selectively deposit nickel on the grid layer 8 without putting holes at the bottom.
- a second step is to deposit on the entire structure thus obtained a layer 14 of an electron emitting material like for example the molybdenum.
- This deposit is made by evaporation of molybdenum under almost normal incidence.
- the major drawback of the technique just remembered basically lies in evaporation of the sacrificial layer under incidence grazing.
- the grazing incidence means that place on a crown, in the evaporation device, the structures on which we want to form the layer of nickel.
- the processing time is long, in particular due to the evaporation of nickel which must be made at low speed to avoid projections.
- Evaporation of the material leading to microtips is done at an angle of incidence less than 10 ° (almost normal incidence).
- the object of the present invention is to remedy to the previous drawbacks, replacing evaporation under grazing incidence by a wet chemical deposit.
- the invention makes it possible in particular to simplify the evaporation device it was question above and increase the ability to production of it, as will be seen better by the after.
- the present invention allows deposit microtips on large areas.
- the wet chemical deposition is an electrolytic deposition.
- the grid layer as a cathode for this electrolytic deposition.
- the sacrificial layer is eliminated by electrolysis.
- This sacrificial layer can be made of a material chosen from the group comprising the metals Cr, Fe, Ni, Co, Cd, Cu, Au, Ag and alloys of these metals.
- this sacrificial layer is made of an alloy of iron and nickel.
- Figure 2 illustrates schematically a structure that was discussed in the description of FIG. 1 and which comprises, on the surface, the grid layer 8, this structure not comprising not layers 12 and 14.
- FIG. 2 The structure of Figure 2 has been coated a sacrificial layer 18 in accordance with the invention, by electrolytic deposition.
- the technique used in the present invention leads to a selective deposition on the grid layer 8, like the allowed evaporation under grazing incidence.
- This electrolysis deposition technique which can be used in the present invention, has the advantage of being fast and inexpensive since it does not requires only electrolysis equipment.
- Figure 3 shows a device evaporation under vacuum allowing, in accordance with prior art, the deposition of a layer sacrificial under grazing incidence and the deposit of a layer of electron-emitting material under incidence almost normal.
- FIG. 3 We have represented very schematically on the FIG. 3 a vacuum enclosure 20 and, therein, substrates 22 on which we want to do first evaporation of the sacrificial layer under incidence grazing then depositing the layer of emitting material of electrons under almost normal incidence.
- Tilting means 26, which are shown schematically by arrows in Figure 3, are planned to go from grazing incidence deposit to almost normal incidence deposition from a source 28 of electron emitting material.
- Figure 4 shows a device of evaporation usable in the present invention.
- This device is much simpler than that of FIG. 3 since, in a conforming process to the invention, only the evaporation of a electron-emitting material, under an incidence almost normal, to form microtips.
- the deposition of the sacrificial layer can be easily performed on malls.
- a structure 29 comprising a glass substrate 30 on which is formed a layer of silica 32.
- Cathodic conductors made of niobium 34 are formed on the silica layer 32.
- cathode conductors 34 have a 0.2 ⁇ m thick and have a lattice structure with for example square meshes whose pitch is worth 25 ⁇ m.
- cathode conductors 34 made of niobium constitute the columns of the electron source to form.
- a resistive layer 36 of amorphous silicon doped with phosphorus is deposited on the conductors cathodic.
- This layer 36 is around 1 ⁇ m.
- An insulating layer 38 of silica is deposited on this resistive layer 36.
- the thickness of the silica layer 38 is also of the order of 1 ⁇ m.
- a metallic layer 40 of niobium is deposited on the silica layer 38.
- This layer 40 constitutes a layer of wire rack.
- This grid layer 40 is around 0.4 ⁇ m.
- Holes 42 of 1.4 ⁇ m in diameter are etched in the grid layer 40 and in the layer insulating 38.
- These holes 42 are placed in the area central mesh of the trellis and lead to the resistive layer 36.
- sacrificial layer 44 of iron alloy and of nickel on the gate layer 40 by electrolysis.
- the layer of grid 40 serves as a cathode.
- This deposition is carried out by evaporation under almost normal incidence.
- Microdots 54 are thus formed in the holes 42.
- microtips 42 rest on the layer resistive 36.
- the sacrificial layer 44 is dissolved by electrolysis.
- an electric voltage source appropriate 58 By means of an electric voltage source appropriate 58, an electrical voltage is established between the sacrificial layer 44 and an appropriate electrode 60 placed in the electrolytic bath 52.
- the sacrificial layer 44 serves as an anode and electrode 60 acts as a cathode during electrolysis.
- the voltage applied by the source 58 enters the layer 44 and the electrode 60 is approximately 2V.
- the time required for the dissolution of the sacrificial layer 44 generally varies between 30 min and 60 mins.
Description
- un substrat électriquement isolant 2, par exemple en verre,
- des conducteurs cathodiques 4 sur ce substrat,
- une couche électriquement isolante 6 qui recouvre chaque conducteur cathodique, et
- une couche de grille 8 électriquement conductrice qui recouvre cette couche électriquement isolante.
- on fabrique une structure comprenant un substrat électriquement isolant, au moins un conducteur cathodique sur ce substrat, une couche électriquement isolante qui recouvre chaque conducteur cathodique, une couche de grille électriquement conductrice qui recouvre cette couche électriquement isolante,
- on forme des trous à travers la couche de grille et la couche électriquement isolante au niveau de chaque conducteur cathodique,
- on forme sur la couche de grille une couche sacrificielle,
- on dépose sur l'ensemble de la structure ainsi obtenue une couche d'un matériau émetteur d'électrons, d'où la formation, dans chaque trou, d'une micropointe, et
- on élimine la couche sacrificielle, ce qui entraíne l'élimination du matériau émetteur d'électrons placé au-dessus de cette couche sacrificielle,
- la figure 1, déjà décrite, illustre schématiquement des étapes de fabrication d'une source d'électrons à micropointes selon un procédé connu,
- la figure 2 illustre schématiquement une étape de fabrication d'une telle source selon un procédé conforme à l'invention,
- la figure 3 est une vue schématique et partielle d'un dispositif d'évaporation permettant une évaporation sous incidence rasante d'une couche sacrificielle selon une technique antérieure,
- la figure 4 est une vue schématique et partielle d'un dispositif d'évaporation utilisable pour la mise en oeuvre de la présente invention, et
- les figures 5 et 6 illustrent schématiquement des étapes d'un mode de mise en oeuvre particulier du procédé objet de l'invention.
Claims (5)
- Procédé de fabrication d'une source d'électrons à micropointes, procédé selon lequel :on fabrique une structure comprenant un substrat électriquement isolant (2, 32), au moins un conducteur cathodique (4, 34) sur ce substrat, une couche électriquement isolante (6, 38) qui recouvre chaque conducteur cathodique, une couche de grille électriquement conductrice (8, 40) qui recouvre cette couche électriquement isolante,on forme des trous (10, 42) à travers la couche de grille et la couche électriquement isolante au niveau de chaque conducteur cathodique,on forme sur la couche de grille une couche sacrificielle (18, 44),on dépose sur l'ensemble de la structure ainsi obtenue une couche (52) d'un matériau émetteur d'électrons, d'où la formation, dans chaque trou, d'une micropointe (54), eton élimine la couche sacrificielle, ce qui entraíne l'élimination du matériau émetteur d'électrons placé au-dessus de cette couche sacrificielle,
- Procédé selon la revendication 1, caractérisé en ce que le dépôt chimique humide est un dépôt électrolytique.
- Procédé selon la revendication 2, caractérisé en ce que la couche sacrificielle (18, 44) est éliminée par électrolyse.
- Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la couche sacrificielle (18, 44) est faite d'un matériau choisi dans le groupe comprenant les métaux Cr, Fe, Ni, Co, Cd, Cu, Au, Ag et les alliages de ces métaux.
- Procédé selon la revendication 4, caractérisé en ce que la couche sacrificielle (18, 44) est faite d'un alliage de fer et de nickel.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9412467A FR2726122B1 (fr) | 1994-10-19 | 1994-10-19 | Procede de fabrication d'une source d'electrons a micropointes |
FR9412467 | 1994-10-19 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0708473A1 EP0708473A1 (fr) | 1996-04-24 |
EP0708473B1 true EP0708473B1 (fr) | 1999-01-20 |
Family
ID=9467993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95402312A Expired - Lifetime EP0708473B1 (fr) | 1994-10-19 | 1995-10-17 | Procédé de fabrication d'une source d'électrons à micropointes |
Country Status (5)
Country | Link |
---|---|
US (1) | US5679044A (fr) |
EP (1) | EP0708473B1 (fr) |
JP (1) | JPH08227653A (fr) |
DE (1) | DE69507418T2 (fr) |
FR (1) | FR2726122B1 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5893967A (en) * | 1996-03-05 | 1999-04-13 | Candescent Technologies Corporation | Impedance-assisted electrochemical removal of material, particularly excess emitter material in electron-emitting device |
US6027632A (en) * | 1996-03-05 | 2000-02-22 | Candescent Technologies Corporation | Multi-step removal of excess emitter material in fabricating electron-emitting device |
US5766446A (en) * | 1996-03-05 | 1998-06-16 | Candescent Technologies Corporation | Electrochemical removal of material, particularly excess emitter material in electron-emitting device |
US5944975A (en) * | 1996-03-26 | 1999-08-31 | Texas Instruments Incorporated | Method of forming a lift-off layer having controlled adhesion strength |
US6120674A (en) * | 1997-06-30 | 2000-09-19 | Candescent Technologies Corporation | Electrochemical removal of material in electron-emitting device |
US6007695A (en) * | 1997-09-30 | 1999-12-28 | Candescent Technologies Corporation | Selective removal of material using self-initiated galvanic activity in electrolytic bath |
US6062931A (en) * | 1999-09-01 | 2000-05-16 | Industrial Technology Research Institute | Carbon nanotube emitter with triode structure |
JP4803998B2 (ja) * | 2004-12-08 | 2011-10-26 | ソニー株式会社 | 電界放出型電子放出素子の製造方法 |
TWI437615B (zh) * | 2011-06-07 | 2014-05-11 | Au Optronics Corp | 場發射顯示元件之製作方法及應用於製作場發射顯示元件之電化學系統 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3340777A1 (de) * | 1983-11-11 | 1985-05-23 | M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8000 München | Verfahren zur herstellung von duennfilm-feldeffekt-kathoden |
FR2593953B1 (fr) * | 1986-01-24 | 1988-04-29 | Commissariat Energie Atomique | Procede de fabrication d'un dispositif de visualisation par cathodoluminescence excitee par emission de champ |
FR2623013A1 (fr) | 1987-11-06 | 1989-05-12 | Commissariat Energie Atomique | Source d'electrons a cathodes emissives a micropointes et dispositif de visualisation par cathodoluminescence excitee par emission de champ,utilisant cette source |
EP0364964B1 (fr) * | 1988-10-17 | 1996-03-27 | Matsushita Electric Industrial Co., Ltd. | Cathodes à émission de champ |
US4964946A (en) * | 1990-02-02 | 1990-10-23 | The United States Of America As Represented By The Secretary Of The Navy | Process for fabricating self-aligned field emitter arrays |
FR2663462B1 (fr) | 1990-06-13 | 1992-09-11 | Commissariat Energie Atomique | Source d'electrons a cathodes emissives a micropointes. |
FR2687839B1 (fr) | 1992-02-26 | 1994-04-08 | Commissariat A Energie Atomique | Source d'electrons a cathodes emissives a micropointes et dispositif de visualisation par cathodoluminescence excitee par emission de champ utilisant cette source. |
US5458520A (en) * | 1994-12-13 | 1995-10-17 | International Business Machines Corporation | Method for producing planar field emission structure |
-
1994
- 1994-10-19 FR FR9412467A patent/FR2726122B1/fr not_active Expired - Fee Related
-
1995
- 1995-09-28 US US08/535,465 patent/US5679044A/en not_active Expired - Fee Related
- 1995-10-17 DE DE69507418T patent/DE69507418T2/de not_active Expired - Fee Related
- 1995-10-17 EP EP95402312A patent/EP0708473B1/fr not_active Expired - Lifetime
- 1995-10-18 JP JP29377495A patent/JPH08227653A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPH08227653A (ja) | 1996-09-03 |
FR2726122A1 (fr) | 1996-04-26 |
US5679044A (en) | 1997-10-21 |
FR2726122B1 (fr) | 1996-11-22 |
DE69507418D1 (de) | 1999-03-04 |
EP0708473A1 (fr) | 1996-04-24 |
DE69507418T2 (de) | 1999-07-15 |
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