EP4248500A1 - Procédé de fabrication d'un dispositif à led - Google Patents
Procédé de fabrication d'un dispositif à ledInfo
- Publication number
- EP4248500A1 EP4248500A1 EP21801860.4A EP21801860A EP4248500A1 EP 4248500 A1 EP4248500 A1 EP 4248500A1 EP 21801860 A EP21801860 A EP 21801860A EP 4248500 A1 EP4248500 A1 EP 4248500A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- leds
- upper face
- etching
- respect
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 32
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052814 silicon oxide Inorganic materials 0.000 claims abstract description 23
- 238000000151 deposition Methods 0.000 claims abstract description 22
- 239000004065 semiconductor Substances 0.000 claims abstract description 18
- 230000005693 optoelectronics Effects 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 123
- 238000005530 etching Methods 0.000 claims description 27
- 239000011241 protective layer Substances 0.000 claims description 19
- 230000008021 deposition Effects 0.000 claims description 13
- 238000001020 plasma etching Methods 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 239000002861 polymer material Substances 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 3
- 229910001882 dioxygen Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 description 14
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000005137 deposition process Methods 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000002070 nanowire Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004341 Octafluorocyclobutane Substances 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- BKHJHGONWLDYCV-UHFFFAOYSA-N [C]=O.[C] Chemical compound [C]=O.[C] BKHJHGONWLDYCV-UHFFFAOYSA-N 0.000 description 2
- 238000000231 atomic layer deposition Methods 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- BCCOBQSFUDVTJQ-UHFFFAOYSA-N octafluorocyclobutane Chemical compound FC1(F)C(F)(F)C(F)(F)C1(F)F BCCOBQSFUDVTJQ-UHFFFAOYSA-N 0.000 description 2
- 235000019407 octafluorocyclobutane Nutrition 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 238000005240 physical vapour deposition Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- IJCVBMSXIPFVLH-UHFFFAOYSA-N [C].S=O Chemical compound [C].S=O IJCVBMSXIPFVLH-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002096 quantum dot Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/813—Bodies having a plurality of light-emitting regions, e.g. multi-junction LEDs or light-emitting devices having photoluminescent regions within the bodies
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H29/00—Integrated devices, or assemblies of multiple devices, comprising at least one light-emitting semiconductor element covered by group H10H20/00
- H10H29/10—Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00
- H10H29/14—Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00 comprising multiple light-emitting semiconductor components
- H10H29/142—Two-dimensional arrangements, e.g. asymmetric LED layout
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/852—Encapsulations
- H10H20/854—Encapsulations characterised by their material, e.g. epoxy or silicone resins
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/01—Manufacture or treatment
- H10H20/036—Manufacture or treatment of packages
- H10H20/0362—Manufacture or treatment of packages of encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/85—Packages
- H10H20/852—Encapsulations
- H10H20/853—Encapsulations characterised by their shape
Definitions
- TITLE Process for manufacturing an LED device
- the present description relates generally to optoelectronic devices, and more particularly relates to the production of an emissive display device with light-emitting diodes (LEDs) comprising three-dimensional semiconductor elements, for example of the nanowire or microwire type.
- LEDs light-emitting diodes
- each pixel of the screen comprises several elementary three-dimensional LEDs, each consisting of a three-dimensional semiconductor element, for example of nanowire or microwire type, connected in parallel between two electrodes of an active screen control circuit.
- One embodiment provides a method for manufacturing an optoelectronic device, comprising the following steps:
- the first material is such that the first layer is etchable selectively with respect to the LEDs and that the second layer is etchable selectively with respect to the first layer .
- the first layer is made of a carbonaceous polymer material.
- the method further comprises, before the deposition of the first layer, a conformal deposition step of a protective layer coating the LEDs.
- the first material is selectively etchable with respect to the protective layer.
- the protective layer is made of silicon nitride.
- the method comprises a step of forming a localized cavity in the stack comprising the first and second layers.
- the step of forming the cavity comprises a first step of etching the second layer by an etching process that is selective with respect to the material of the first layer, followed by a second step of etching of the first layer by a selective etching process compared to LEDs.
- the first etching step is a plasma etching implemented by means of a fluoro-carbon plasma.
- the second etching is a plasma etching implemented by means of a plasma based on dioxygen or dihydrogen.
- the method further comprises, after the step of depositing the second layer and before the step of forming the cavity, a step of fixing a temporary substrate on the upper face of the second layer, then a step of removing the temporary substrate so as to free up access to the upper face of the second layer.
- the first layer is spin coated.
- Figures IA and IB are sectional views schematically representing successive steps of an example of a method of manufacturing an LED device.
- FIGS. 2A, 2B and 2C are cross-sectional views schematically representing successive steps of an example of a method for manufacturing an LED device according to one embodiment.
- Figures IA and IB are sectional views schematically representing successive steps of an example of a method of manufacturing a three-dimensional LED device.
- FIG. 1A illustrates an intermediate structure comprising a substrate 100 and, on the side of the upper face of the substrate 100, a plurality of three-dimensional elementary LEDs 101, for example identical or similar (except for manufacturing dispersions) each consisting of a three-dimensional semiconductor element, for example a semiconductor nanowire or microwire.
- a three-dimensional semiconductor element is meant here an element of elongated shape in a preferred direction called the longitudinal direction. Such an element may have a wire shape, or even a conical or frustoconical shape, or a pyramidal shape.
- each three-dimensional semiconductor element has a maximum transverse dimension comprised between 5 nm and 2.5 ⁇ m, for example between 50 nm and 1 ⁇ m, and a longitudinal dimension greater than or equal to 1 times, preferably greater than or equal to 5 times its maximum transverse dimension.
- Each elementary LED 101 comprises for example one or more semiconductor materials chosen from the group comprising III-V compounds, II-VI compounds or group IV semiconductors or compounds.
- Each LED 101 may be at least partly formed from gallium nitride.
- Each three-dimensional semiconductor element constituting an LED 101 may have an elongated shape along an axis substantially perpendicular to the upper face of the substrate 100, for example a generally cylindrical shape.
- the distance between the longitudinal axes of two LEDs 101 is for example between 100 nm and 3 ⁇ m, for example between 200 nm and 1.5 ⁇ m.
- the height (longitudinal dimension) of the LEDs 101 can be between 250 nm and 15 ⁇ m, preferably between 500 nm and 8 ⁇ m.
- the structure of Figure IA further comprises, on the side of the upper face of the substrate 100, a protective layer 103, for example in a transparent dielectric material in the visible, for example in silicon nitride, coating the sides sides and the upper face of each elementary LED 101, as well as the upper face of the substrate 100 between the elementary LEDs 101.
- the layer 103 is for example produced by a conformal deposition method, for example by DVD deposition (from the English "Physical Vapor Deposition” - physical vapor deposition) or by ALD deposition (from the English "Atomic Layer Deposition” - deposition in monatomic layers), after the growth of the LEDs 101 on the upper face of the substrate 100.
- the layer 103 is extends for example continuously and with a substantially uniform thickness over the entire upper face of the assembly comprising the substrate 100 and the elementary LEDs 101.
- the layer 103 is for example directly in contact with the upper face. ieure and with the lateral flanks of the three-dimensional semiconductor elements constituting the LEDs 101.
- the thickness of the protective layer 103 is less than the spacing between the elementary LEDs 101, so that the layer 103 does not entirely fill the space between the elementary LEDs 101.
- the thickness of the layer 103 is for example between 50 and 500 nm.
- the structure of Figure IA further comprises, on the side of the upper face of the substrate 100, a layer of silicon oxide 105 coating the upper face of the protective layer 103.
- the layer 105 extends over a thickness greater than the height of the three-dimensional elementary LEDs 101. Thus, the layer 105 completely fills the spaces left free between the LEDs 101 and covers the LEDs 101.
- the layer 105 extends for example continuously over the entire surface of the device.
- Layer 105 has a substantially planar upper face.
- the maximum thickness of layer 105 (between LEDs 101) is between 5 and 10 ⁇ m.
- the layer 105 can be deposited by a silicon oxide deposition process at low temperature, for example a deposition process at a temperature less than or equal to 400° C., which makes it possible to avoid degrading the three-dimensional LEDs 101 beforehand. formed.
- the layer 105 is deposited by a process of the PECVD-TEOS type, that is to say a chemical vapor deposition process assisted by plasma, using liquid TEOS (tetraethyl orthosilicate) as a source. of silicon.
- TEOS tetraethyl orthosilicate
- the layer 105 can serve as a bonding interface to fix the assembly comprising the support substrate 100 and the three-dimensional elementary LEDs 101 on a temporary support substrate, for example made of silicon.
- the complete manufacturing process of the optoelectronic device may comprise the following successive steps (not detailed in the figures): a) formation of the three-dimensional LEDs 101 on the upper face of the substrate 100; b) deposition of the protective layer 103 then of the bonding interface layer 105 on the side of the upper face of the substrate 100; c) fixing a temporary support substrate (not visible in the figures), for example made of silicon, on the upper face of the layer 105; d) partial removal of the substrate 100 and production of contact electrodes (not visible in the figures) on the side of the lower face of the elementary LEDs 101, using the temporary support substrate as a handle; e) fixing and electrical connection of an integrated circuit for controlling the elementary LEDs 101, for example a CMOS circuit, on the side of the lower face of the LEDs 101; and f)
- the temporary support substrate can be fixed by direct bonding or molecular bonding of the lower face of the temporary substrate on the upper face of the layer 105.
- the provision of an interface layer 105 in silicon oxide is advantageous in that the fixing of a temporary substrate of silicon by molecular bonding on a flat face of a layer of silicon oxide (step c)) and the subsequent removal of the temporary substrate (step f) ) are well-known processes in the field of microelectronics.
- the three-dimensional elementary LEDs 101 are for example all substantially identical, to the manufacturing dispersions close, and all emit substantially at the same wavelength.
- the elementary LEDs 101 may be coated with at least some pixels of a photoluminescent conversion element (not visible in the figures) .
- the conversion element is adapted to absorb photons at the emission wavelength of the LEDs, and to re-emit photons at another wavelength.
- the LEDs are suitable for mainly emitting blue light
- red in second pixels, to coat the LEDs 101 of the pixel with a conversion element suitable for converting blue light into green light, and, in third pixels, to leave the LEDs 101 uncoated by a conversion element .
- a red-green-blue color image display device is thus obtained.
- the photoluminescent conversion elements are, for example, portions of an organic layer in which quantum dots are embedded, or portions of a layer of phosphorescent material.
- each pixel provided with a photoluminescent conversion element to maximize the coupling between the elementary LEDs 101 and the photoluminescent conversion element of the pixel, provision can be made to locally remove the silicon oxide layer 105 opposite vis-à-vis the LEDs 101 of the pixel.
- the photoluminescent conversion element can then be deposited as close as possible to the LEDs 101.
- Figures IA and IB more particularly illustrate steps of a process for localized removal of the silicon oxide layer 105 vis-à-vis the elementary LEDs 101 of a pixel of the device, with a view to the subsequent deposition of a photoluminescent conversion element.
- Figure IA illustrates the structure obtained at the end of a step of forming an etching mask 107 on the upper face of the layer of silicon oxide 105.
- the mask 107 is for example made of resin, and has an opening 109 facing the portion of the layer 105 that is to be removed.
- the mask 107 is for example produced by photolithography.
- Figure IB illustrates the structure obtained after a step of removing the silicon oxide layer 105 vis-à-vis the opening 109 of the mask 107. During this step, the layer 105 is removed over its entire thickness opposite the opening 109. A cavity 111 located in the layer 105 is thus formed opposite the elementary LEDs 101 of the pixel. Cavity 111 is subsequently intended to receive a photoluminescent conversion element of the pixel. In this example, layer 105 remains intact at the periphery of the pixel.
- the layer 105 is for example removed by a plasma etching process, for example by means of a fluoro-carbon type plasma, for example a plasma based on octafluorocyclobutane (C4F 8 ), carbon monoxide carbon (CO) and argon (Ar).
- a fluoro-carbon type plasma for example a plasma based on octafluorocyclobutane (C4F 8 ), carbon monoxide carbon (CO) and argon (Ar).
- the layer 105 etching process is chosen to be relatively selective with respect to the material of the protective layer 103.
- the selectivity obtained is insufficient in practice.
- FIG. 1B significant faceting of the three-dimensional LEDs 101 is observed during etching. In other words, the LEDs 101 located in the cavity 111 are degraded, and may possibly be destroyed during burning.
- Figures 2A, 2B and 2C are sectional views schematically representing successive steps of an example of a method of manufacturing a three-dimensional LED device according to one embodiment, aimed at overcoming the aforementioned drawback of the method of Figures IA and IB.
- Figure 2A illustrates an intermediate structure similar to the structure of Figure IA.
- the structure of FIG. 2A differs from that of FIG. IA mainly in that, in the structure of FIG. 2A, the layer of silicon oxide 105 is replaced by a bi-layer comprising a lower layer 205a of a first material different from silicon oxide, and an upper layer 205b of silicon oxide.
- the layer 205a extends over a thickness greater than the height of the three-dimensional elementary LEDs 101. Thus, the layer 205a completely fills the spaces left free between the LEDs 101 and covers the LEDs 101.
- the layer 205a extends by example continuously over the entire surface of the device.
- Layer 205a preferably has a substantially planar upper face. By way of example, the maximum thickness of layer 205a (between LEDs 101) is between 5 and 10 ⁇ m.
- the layer 205a is for example in contact, by its lower face, with the upper face of the protective layer 103.
- the layer 205a is preferably deposited by a low temperature deposition process, for example at a temperature lower than or equal to 400°C.
- Layer 205a can be deposited by a spin coating process, having the advantage of planarizing the upper surface of layer 205a.
- the layer 205b extends continuously and over a substantially uniform thickness, over the entire surface of the device.
- the layer 205b is for example in contact, by its lower face, with the upper face of the layer 205a.
- Layer 205b has a substantially planar top surface.
- Layer 205b can be deposited by a low temperature silicon oxide deposition process, for example a deposition process at a temperature less than or equal to 400° CA.
- layer 205b is deposited by a process of PECVD-TEOS type.
- a step of planarization of the upper face of the layer 205b can be implemented to improve its flatness.
- the thickness of layer 205b is for example between 0.5 and 5 ⁇ m, for example between 1 and 2 ⁇ m.
- the layer 205b can serve as a bonding interface to fix the assembly comprising the support substrate 100 and the three-dimensional elementary LEDs 101 on a temporary support substrate, for example made of silicon, as described above.
- cavities can be formed in the stack of layers 205a and 205b facing certain pixels of the sensor, these cavities being for receiving photoluminescent color conversion elements.
- FIGS. 2A, 2B and 2C more particularly illustrate steps of a process for the localized removal of the stack of layers 205a and 205b opposite the elementary LEDs 101 of a pixel of the device, in view subsequent deposition of a photoluminescent conversion element.
- the layer 205a is made of a material such that the first layer is etchable selectively with respect to the LEDs 101 and such that the silicon oxide layer 205b is etchable selectively with respect to the layer 205a.
- the material of layer 205a is chosen to be selectively etchable relative to the material of protective layer 103.
- protective layer 103 may be omitted, in which case the material of layer 205a is chosen to be etchable selectively with respect to the semiconductor materials of the LEDs 101.
- the layer 205a is preferably made of a dielectric material.
- Layer 205a is for example made of a polymer material, preferably a carbon polymer or organic polymer.
- the material of layer 205a is preferably resistant to relatively high temperatures, for example between 400°C and 600°C. This makes it possible to withstand subsequent heat treatment steps, in particular during the deposition of the photoluminescent conversion elements.
- the material of layer 205a is a hydrocarbon polymer, for example of the type known under the trade name SiLK.
- the material of the layer 205a can be a polymer of the type commonly designated by the acronym SoC, from the English “spin-on carbon", that is to say a polymer material with a high carbon content. , for example with a carbon concentration greater than 80%, which can be deposited with a spinner.
- the material of layer 205a may be a polyimide.
- FIG. 2A illustrates the structure obtained at the end of a step of forming an etching mask 107 on the upper face of the layer of silicon oxide 205b.
- the mask 107 is for example made of resin, and has an opening 109 facing the portion of the stack of layers 205a and 205b that one wishes to remove.
- the mask 107 is for example produced by photolithography.
- FIG. 2B illustrates the structure obtained at the end of a step of removing the layer of silicon oxide 205b opposite the opening 109 of the mask 107.
- the layer 205b is removed over its entire thickness opposite the opening 109.
- a cavity 111 located in the layer 205b is thus formed opposite the elementary LEDs 101 of the pixel.
- etching is interrupted on the upper face of layer 205a.
- the layer 205b is removed by an etching process suitable for etching the silicon oxide selectively with respect to the material of the layer 205a.
- the layer 205b is for example removed by a plasma etching process, for example by means of a plasma of the fluoro-carbon type, for example a plasma based on octaf luorocyclobutane (C4F 8 ), carbon monoxide carbon (CO) and argon (Ar).
- a plasma of the fluoro-carbon type for example a plasma based on octaf luorocyclobutane (C4F 8 ), carbon monoxide carbon (CO) and argon (Ar).
- FIG. 2C illustrates the structure obtained at the end of a step of removing layer 205a facing opening 109 of mask 107.
- layer 205a is removed on its entire thickness facing the opening 109.
- the cavity 111 is thus extended facing the elementary LEDs 101 of the pixel.
- the etching is interrupted on the upper face of the protective layer 103 of the elementary LEDs 101.
- the layer 205a is removed by an etching process suitable for etching the material of the layer 205a selectively with respect to to the material of the protection layer 103.
- the protection layer 103 can be omitted, in which case the etching is interrupted directly on the semiconductor material of the elementary LEDs 101.
- the layer 205a is removed by an etching process adapted to etching the material of the layer 205a selectively with respect to the semiconductor materials of the LEDs 101.
- the layer 205a is for example removed by a plasma etching process, for example by means of a plasma based on oxygen, for example a plasma based on oxygen (O2) and argon (Ar), or a plasma based on oxygen (O2), nitrogen (N 2 ) and carbon tetrafluoride (CF 4 ), or a plasma based on sulfur dioxide (SO2) and oxygen (O2) or a plasma based carbon oxysulphide (COS) and dioxygen (O2).
- a plasma based on oxygen for example a plasma based on oxygen (O2) and argon (Ar)
- the layer 205a is removed by means of a plasma based on dihydrogen (H2) or a plasma based
- chemistries have the advantage of etching the carbonaceous polymer materials very selectively compared to the silicon nitride of the protective layer 103, or compared to the semiconductor materials of the LEDs 101 in the absence of the protective layer 103 .
- An advantage of the method described in relation to FIGS. 2A, 2B and 2C is that it makes it possible to eliminate the problem of faceting of the elementary LEDs 101 of the method of FIGS. IA and IB. This can in particular make it possible to reduce the thickness of the protective layer 103, or even to entirely eliminate the protective layer 103.
- the layer 103 has a thickness comprised between 0.1 and 1 ⁇ m.
Landscapes
- Led Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2011913A FR3116381B1 (fr) | 2020-11-19 | 2020-11-19 | Procédé de fabrication d'un dispositif à LED |
| PCT/EP2021/079708 WO2022106160A1 (fr) | 2020-11-19 | 2021-10-26 | Procédé de fabrication d'un dispositif à led |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4248500A1 true EP4248500A1 (fr) | 2023-09-27 |
Family
ID=74860033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21801860.4A Pending EP4248500A1 (fr) | 2020-11-19 | 2021-10-26 | Procédé de fabrication d'un dispositif à led |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20240006459A1 (fr) |
| EP (1) | EP4248500A1 (fr) |
| FR (1) | FR3116381B1 (fr) |
| WO (1) | WO2022106160A1 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1993297U (de) | 1968-06-10 | 1968-09-05 | Burger Eisenwerke Ag | Abluftstutzen fuer dunstabzugshaube. |
| TW201515091A (zh) * | 2013-06-18 | 2015-04-16 | Glo Ab | 藉由乾式蝕刻移除3d半導體結構之方法 |
| FR3076170B1 (fr) * | 2017-12-22 | 2020-05-15 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede de report de structures electroluminescentes |
| FR3091027B1 (fr) | 2018-12-21 | 2022-11-18 | Aledia | Dispositif optoélectronique |
-
2020
- 2020-11-19 FR FR2011913A patent/FR3116381B1/fr active Active
-
2021
- 2021-10-26 WO PCT/EP2021/079708 patent/WO2022106160A1/fr not_active Ceased
- 2021-10-26 EP EP21801860.4A patent/EP4248500A1/fr active Pending
- 2021-10-26 US US18/037,283 patent/US20240006459A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20240006459A1 (en) | 2024-01-04 |
| FR3116381A1 (fr) | 2022-05-20 |
| WO2022106160A1 (fr) | 2022-05-27 |
| FR3116381B1 (fr) | 2022-12-16 |
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