WO2008069930A2 - Flexible substrates having a thin-film barrier - Google Patents
Flexible substrates having a thin-film barrier Download PDFInfo
- Publication number
- WO2008069930A2 WO2008069930A2 PCT/US2007/024435 US2007024435W WO2008069930A2 WO 2008069930 A2 WO2008069930 A2 WO 2008069930A2 US 2007024435 W US2007024435 W US 2007024435W WO 2008069930 A2 WO2008069930 A2 WO 2008069930A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- barrier layer
- flexible substrate
- gpa
- modulus
- substrate
- Prior art date
Links
- 230000004888 barrier function Effects 0.000 title claims abstract description 222
- 239000000758 substrate Substances 0.000 title claims abstract description 144
- 239000010409 thin film Substances 0.000 title claims description 15
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- GCFDVEHYSAUQGL-UHFFFAOYSA-J fluoro-dioxido-oxo-$l^{5}-phosphane;tin(4+) Chemical compound [Sn+4].[O-]P([O-])(F)=O.[O-]P([O-])(F)=O GCFDVEHYSAUQGL-UHFFFAOYSA-J 0.000 claims description 11
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- KAMGYJQEWVDJBD-UHFFFAOYSA-N bismuth zinc borate Chemical compound B([O-])([O-])[O-].[Zn+2].[Bi+3] KAMGYJQEWVDJBD-UHFFFAOYSA-N 0.000 claims description 3
- 238000010549 co-Evaporation Methods 0.000 claims description 3
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- GEZAUFNYMZVOFV-UHFFFAOYSA-J 2-[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphastannetan-2-yl)oxy]-1,3,2$l^{5},4$l^{2}-dioxaphosphastannetane 2-oxide Chemical compound [Sn+2].[Sn+2].[O-]P([O-])(=O)OP([O-])([O-])=O GEZAUFNYMZVOFV-UHFFFAOYSA-J 0.000 description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
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- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(iii) oxide Chemical compound O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 2
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- 229910052681 coesite Inorganic materials 0.000 description 2
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- FPHIOHCCQGUGKU-UHFFFAOYSA-L difluorolead Chemical compound F[Pb]F FPHIOHCCQGUGKU-UHFFFAOYSA-L 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/58—After-treatment
- C23C14/5806—Thermal treatment
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/122—Silica-free oxide glass compositions containing oxides of As, Sb, Bi, Mo, W, V, Te as glass formers
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/14—Silica-free oxide glass compositions containing boron
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/12—Silica-free oxide glass compositions
- C03C3/23—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron
- C03C3/247—Silica-free oxide glass compositions containing halogen and at least one oxide, e.g. oxide of boron containing fluorine and phosphorus
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/10—Glass or silica
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K2102/00—Constructional details relating to the organic devices covered by this subclass
- H10K2102/301—Details of OLEDs
- H10K2102/311—Flexible OLED
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/851—Division of substrate
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/23—Sheet including cover or casing
- Y10T428/239—Complete cover or casing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24777—Edge feature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to methods and apparatus for inhibiting oxygen, moisture, and other gas or liquid penetration, and subsequent degradation of a device mounted on or protected by a flexible substrate.
- this device include a light- emitting device (e.g., organic light emitting diode (OLED) device), a display device, an electronic device (e.g., organic semiconducting devices), a photovoltaic device, a thin-film sensor, an evanescent waveguide sensor, a food container, a medicine container, etc.
- Some aspects of the invention relate to the field of flexible substrates and specifically to the application of flexible displays and flexible electronics.
- substrates that exhibit improvements in durability, thickness, weight, bend radius, and cost.
- flexible substrates having dimensional stability, matched CTE, toughness, transparency, thermal capability, and barrier properties and/or hermeticity suitable for active matrix display fabrication.
- thermoplastics e.g., Polyethylene naphthalate (PEN), Polyethersulfone (PES), Polycarbonate (PC), Polyethylene terephthalate (PET), Polypropylene (PP), oriented polypropylene (OPP), etc.
- glass e.g., borosilicate
- inorganic materials with improved hermeticity and mechanical durability are used as barrier layers for plastics, composites, or other higher temperature, flexible substrates.
- LLT low liquidus temperature
- Some embodiments of the present invention utilize an LLT (low liquidus temperature) material, which typically has a low liquidus temperature (or in specific embodiments a low glass transition temperature), to form a barrier layer on a flexible substrate.
- a device may then be disposed on the barrier layer.
- the aforementioned barrier layer or an additional barrier layer may be disposed on the device.
- the LLT material includes, but is not limited to, tin fluorophosphate glass, chalcogenide glass, tellurite glass and borate glass.
- the LLT material can be deposited onto the flexible substrate by, for example, sputtering, co-evaporation, laser ablation, flash evaporation, spraying, pouring, frit- deposition, vapor-deposition, dip-coating, painting or rolling, spin-coating, or any combination thereof. Defects in the LLT material from the deposition step can be removed by a consolidation step (for example, heat treatment), to produce a pore-free, gas and moisture impenetrable protective coating on the flexible substrate.
- a consolidation step for example, heat treatment
- the consolidation step is only practical with the LLT material where the consolidation temperature is sufficiently low so as to not damage the flexible substrate (and/or any inner layers in the device if disposed thereon).
- the deposition step and/or heat treatment step take place in a vacuum, or in an inert atmosphere, or in ambient conditions depending upon the LLT's composition.
- methods and apparatus provide for: applying an inorganic barrier layer to at least a portion of a flexible substrate; and sintering the inorganic barrier layer at a temperature lower than a critical temperature of the flexible substrate.
- Sintering may include consolidation, annealing, or other mechanisms that expose the barrier layer to thermal or other radiation and result in improved hermetic properties.
- the critical temperature may be at least one of: a softening temperature, a Tg temperature, temperature where about 10% weight loss occurs in the flexible substrate, and a thermal failure temperature of the flexible substrate.
- the temperature of the sintering step may be sufficient to reduce at least one of pinholes, inherent porosity, and defects in the barrier layer.
- the step of sintering may include controlling at least one of: (i) a thickness of the inorganic barrier layer; and (ii) a modulus of the inorganic barrier layer. This may include increasing the modulus of the inorganic barrier layer by sintering to a consolidation temperature. Alternatively or additionally, the control may provide for sintering the inorganic barrier layer to form a modulus gradient such that the modulus at a first depth is different from the modulus at a second depth of the inorganic barrier layer.
- methods and apparatus provide for: (a) computing stress in a barrier layer that has been disposed on a flexible substrate as a function of a modulus of the barrier layer, where the flexible substrate is of a given thickness, a given modulus, and a given radius of curvature; (b) computing the stress in the barrier layer as a function of a thickness of the barrier layer; (c) selecting a target stress for the barrier layer and determining a modulus and thickness for the barrier layer from the computation in (a) - (b); applying the barrier layer to at least a portion of the flexible substrate; and sintering the barrier layer at a temperature lower than a critical temperature of the flexible substrate to control the thickness and modulus of the barrier layer such that the target stress is not exceeded at the given radius of curvature.
- methods and apparatus provide for: applying an inorganic barrier layer to at least a portion of a flexible substrate such that the inorganic barrier layer is patterned on the flexible substrate to create at least one region of the flexible substrate that is free of the inorganic barrier layer; and sintering the inorganic barrier layer at a temperature lower than a critical temperature of the Attorney Docket SP06-180
- an apparatus may include: a flexible substrate; an inorganic barrier layer covering at least a portion of the flexible substrate, wherein at least one of: (i) the modulus of the barrier layer is one of about 30 GPa to about 120 GPa, about 30 GPa to about 80 GPa, and about 30 GPa to about 50 GPa; and (ii) the thickness of the barrier layer is one of less than about 10 ⁇ m, less than about 5 ⁇ m, and less than about 2 ⁇ m.
- the apparatus may further include: a device disposed on the barrier layer; and an encapsulation layer covering the device and terminating on the barrier layer, thereby forming an hermetic seal for the device.
- the device may be at least one of an electronic device, an optoelectronic device, an optical device, a light-emitting device, an OLED device, an organic semiconducting device, an LCD display device, a photovoltaic device, a thin-film sensor, an evanescent waveguide sensor, a food container, and a medicine container.
- FIGURE 1 is a flowchart illustrating the steps of a method for inhibiting oxygen and moisture degradation of a device in accordance with the present invention
- FIGURE 2 is a cross-sectional side view of the device that is protected by LLT material applied by the method shown in FIGURE 1 in accordance with the present invention
- FIGURES 3-6 illustrate several different graphs, photos and diagrams that are used to help explain the different experiments and the results of the different experiments which were conducted to demonstrate the capabilities and advantages of the present invention
- FIGURE 7 is a cross-sectional view of a device that is hermetically sealed between a barrier layer and a flexible substrate layer
- FIGURES 8-13 illustrate several different graphs, photos and diagrams that are used to help explain the different experiments and the results of the different experiments which were conducted to demonstrate the capabilities and advantages of the present invention.
- DETAILED DESCRIPTION [0024] In order to fully and clearly describe the details of the use of a barrier layer on a flexible substrate, a discussion of the deposition and processing of a low liquidus temperature material on one or more layers (such as device layers), all supported on a substrate is first discussed with reference to FIGURES 1-6. Referring to FIGURES 1-2, there are respectively illustrated a flowchart of a method 100 for inhibiting oxygen and moisture degradation of a device 200 and a cross-sectional side view of the protected device 200. As described below, the device 200 includes a heat treated low liquidus temperature (LLT) material 202, one or more inner layers 204 and a support 206.
- LLT heat treated low liquidus temperature
- the method 100 includes step 102 in which the LLT material 202 is deposited over one or more inner layers 204 located on top of the support 206 (e.g., substrate 206)(see also FIGURE 5) of the device 200.
- the LLT material 202 can be deposited using any one of variety of processes including, for example, sputtering, flash evaporation, spraying, pouring, frit-deposition, vapor-deposition, dip-coating, painting, rolling (for example a film LLT material 202), spin-coating, a co-evaporation, a laser ablation process, or any combination thereof. These methods may also deposit other materials associated with the LLT material at the same time such as dispersants or particle surface coatings.
- LLT material 202 can be deposited (e.g., sputtered) at the same time over one or more inner layers 204 located on top of the support 206 (e.g., substrate 206).
- multiple layers of the same or different types of LLT material 202 can be deposited (e.g., sputtered) over one or more inner layers 204 located on top of the support 206 (e.g., substrate 206).
- the method 100 also includes step 104 in which the device 200 including the deposited LLT material 202 is annealed, consolidated, sintered, or heat treated.
- the heat treatment step may Attorney Docket SP06-180
- the heat treatment step 104 is performed to remove defects (e.g., pores or other features that reduce barrier properties) within the LLT material 202 which were formed during the deposition step 102.
- the heat treatment is conducted at a temperature that does not damage inner layers located on the support (substrate) 206 of the device 200.
- Some examples of different devices 200 that can be protected by the heat treated LLT material 202 include a light-emitting device (e.g., OLED device), display devices (e.g., LCD displays), a photovoltaic device, a thin-film sensor, an evanescent waveguide sensor, a food container and a medicine container.
- the deposition step 102 and the heat treatment step 104 can be performed in a vacuum or inert atmosphere. This is done to ensure that the water-less and oxygen-free condition is maintained throughout the sealing process. This is especially important for robust, long-life operation of organic electronics with minimal degradation.
- the device 200 is an OLED device that has multiple inner layers 204 which include a cathode and electro-luminescent materials that are located on the substrate 206.
- the cathode and electro-luminescent materials 204 can be easily damaged if they are heated above, for example, 100-125 °C.
- the heat treatment step 104 (so as to minimize or eliminate porosity) would not be possible in this particular application if traditional glass was deposited on the OLED device 200.
- the heat treatment step 104 can be performed in this particular application because the temperature (e.g., 120°C) needed to remove the defects in the LLT material 202 can be relatively low such that the OLED device's inner layers 204 would not be damaged. Likewise, the heat treatment step 104 occurs at a temperature low enough that no damage occurs to substrate 206 which may include polymeric or composite materials.
- LLT material 202 makes this all possible because this type of material has a relatively low liquidus temperature, e.g., ⁇ 1000°C.
- the low liquidus temperature means that the LLT 202 can be heat treated at a relatively low temperature to obtain a pore-free film which will not thermally damage the OLED device's inner layer(s) 204 or substrate 206.
- the heat treated LLT material 202 can also be used as a barrier layer on a wide variety of devices 200 in addition to the OLED device 202 such as a Attorney Docket SP06-180
- thin-film sensor display devices, an organic semiconductor device, a photovoltaic device, other electronic devices, an evanescent waveguide sensor, a food container, a medicine container or an electronic device that is sensitive to moisture, oxygen or other gases or liquids (for example).
- the LLT material 202 has low liquidus temperature ⁇ 1000°C (and more preferably ⁇ 600°C and even more preferably ⁇ 400°C) and can include, for example, glass such as tin fluorophosphate glass, chalcogenide glass, tellurite glass, borosilicate glass, borate glass and phosphate glass (e.g., alkali Zn or SnZn pyrophosphates), materials containing both glass and crystalline components, as well as other materials responsive to an annealing treatment.
- glass such as tin fluorophosphate glass, chalcogenide glass, tellurite glass, borosilicate glass, borate glass and phosphate glass (e.g., alkali Zn or SnZn pyrophosphates), materials containing both glass and crystalline components, as well as other materials responsive to an annealing treatment.
- glass such as tin fluorophosphate glass, chalcogenide glass, tellurite glass, borosilicate glass,
- the low liquidus temperature (LLT) materials can be devoid of heavy metals and other environmentally undesirable materials.
- the LLT materials can be durable and exhibit low dissolution rates when immersed in water at 85 0 C ( ⁇ 20 microns per day). See, Tick, P. A., "Water Durable Glasses with
- the LLT material can contain dye molecules and can be doped to levels as high as
- the LLT phosphate glasses have helium permeability coefficients 4 to 5 orders of magnitude less than that of fused silica. See, Peter, K. H., Ho, D., Thomas, S., Friend,
- TABLE 1 The tin fluorophosphate glass 202 is discussed first and the preferred composition ranges of the various constituents (in parts by weight) are indicated in TABLE 1. TABLE 1
- composition nos. 1-3 Three different tin fluorophosphate glasses 202 (composition nos. 1-3), one tellurite glass 202 (composition no. 4) and one borate glass 202 (composition no. 5) have been tested. Details about these tested LLT glasses 202 and the results and conclusions from those experiments are described next.
- TABLES 2 A and 2B illustrate the compositions of the tested exemplary LLT glasses 202 with their T G (in this example and other examples herein T G is related to the low liquidus temperature) and various constituents as follows: TABLE 2A (atomic or element percenf)
- FIGURE 3 is a graph that illustrates the results of a weight loss experiment that was conducted for 1000 hours in 85°C DI water.
- the tested LLT glasses 202 (composition nos. 1, 2 and 4) have a durability that is comparable to Corning Incorporated code 1737 glass (traditional glass).
- the graph results for code 1737 glass, and composition numbers 1, 2, and 4 are indicated using reference numerals "1737", “1", "2", and "4", respectively.
- FIGURE 4 is a graph that indicates the normalized weight loss measurements of the tested LLT glasses 202 (composition nos. 1 and 4-5).
- composition numbers 1, 4, and 5 are designated by reference numerals "1", "4", and "5", respectively.
- FIGURE 5 is a cross- sectional side view of an oven 502 which contains a device 200 that includes LLT glass films 202 (composition no. 1), two inner layers 204 (Al and Ca) and a substrate 206 (Corning
- the inner layers 204 may include a 100 nm (nanometer) thick calcium layer and/or a 200 run thick aluminum layer.
- the LLT glass layers 202 (which may be made of composition 1) may have a thickness equal to or greater than 1000 nm.
- the Al and Ca layers 204 were deposited on the thick substrate 206 and then encapsulated with LLT glass films 202 (composition no. 1).
- the Ca layer 204 was initially a highly reflecting metallic mirror. If water and oxygen penetrated the top encapsulation layer of LLT glass films 202, then the metallic Ca Attorney Docket SP06-180
- the "calcium patch” test was performed as follows. A 100 nm Ca film 204 was evaporated onto a Corning Incorporated code 1737 glass substrate 206. Then, a 200 nm Al layer 204 was evaporated on the Ca film 204. The Al layer 204 was used to simulate the conditions of a cathode typically used to produce polymer light emitting diodes (PLEDs). Using a "dual-boat” customized thermal evaporator (308R evaporator, Cressington Scientific Instruments Ltd., Watford, UK, www.cressington.com), the code 1737 glass substrate 206 was maintained at 130°C and approximately 10 "6 Torr during the Ca and Al evaporation steps.
- PLEDs polymer light emitting diodes
- the LLT glass 202 (composition no. 1) was then sputtered onto the Al and Ca layers 204 under relatively gentle RF power deposition conditions (30 W forward/1 W reflected RF power) and low argon pressure ( ⁇ 19 sccm)(see step 102 in FIGURE 1). The sputtering was performed for 24 hours to obtain a glass thickness in the range of 2.5 ⁇ m (chamber pressure ⁇ 10 "3 Torr).
- the LLT material thickness can be made as thick as one needs depending on one's chosen deposition duration.
- some of the newly created devices 200 were heated to -121 °C by an infrared lamp which was mounted in the vacuum chamber to consolidate the sputtered LLT glass layers 202.
- the vacuum was broken and the heat-treated devices 200 and the non-heat-treated devices 200 were placed in a humidity chamber and held at 85 0 C and 85% relative humidity. During this period, pictures were taken at regular time intervals to quantify the evolution of the tested devices 200. A discussion of the changes to the calcium film in the tested devices 200, prepared under slightly different conditions, is provided below.
- FIGURE 6 is a graph that illustrates the percentage of calcium area oxidized due to time (in hours) spent in the 85°C and 85% relative humidity oven 502 for the three tested devices 200 (for which the second through fourth sets of images were taken, discussed above) and one non-covered device.
- data 702 represents the percentage of the calcium patch surface area that was oxidized on a calcium patch that had the 100 nm calcium and 200 ran aluminum layers but was not coated with LLT glass 202.
- Data 704 represents the calcium patch surface area that was oxidized in one of the tested devices 200 which had a 2.5 ⁇ m sputtered LLT glass layer 202 (composition no. 1) that was not heat treated. Data 704 were generated from the second set of images in the discussion above.
- Data 706 represents the calcium patch surface area that was oxidized in another tested device 200 which had a 2.5 ⁇ m sputtered LLT glass layer 202 (composition no. 1) that was heat treated at 121°C for the first hour during the 24 hour deposition period.
- Data 706 were generated from the third set of images in the discussion above.
- data 708 represents the calcium patch surface area that was oxidized in another test device 200 which had a 2.5 ⁇ m sputtered LLT glass layer 202 (composition no. 1) that was heat treated at 121°C for one hour after the 24 hour deposition period.
- Data 708 were generated using the fourth set of images in the discussion above. As can be seen from data 708, the device 200 that was heat treated after the deposition period performed the best.
- the fraction of area, deemed "calcium oxidized” (that is, the percentage of the area of the devices 200 having Ca(OH) 2 coverage), at any given time in the oven 502, is plotted in FIGURE 6.
- the tested device 200 with the LLT glass 202 (composition no. 1) that was heat treated at 121°C after the 24 hour film deposition step exhibited the best impermeability for moisture and oxygen (plot 708).
- this experiment has demonstrated that physically deposited low TQ glass thin-film layers 202 can be gently “annealed” to restore the essentially pore-free barrier layer.
- Plot 708 illustrates oxidation data for a sputtered composition 1 material experiencing entire film consolidation.
- Plot 706 illustrates oxidation data for a sputtered composition 1 material experiencing partial film consolidation.
- plot 704 illustrates oxidation data for a sputtered composition 1 material experiencing no consolidation.
- This calcium layer may also be described as having #Ca° ⁇ 7.51 x 10 17 atoms. This calcium layer may further be described as having (#Ca72) gm - 2.51 x 10 "5 grams.
- the water permeation rate in the tested devices 200 were estimated by first calculating the total amount of calcium metal in the 100 nm layer 204. Then, by consulting FIGURE 6 and other additional data, we estimated the time it took for half the calcium in the 1 A" x 1" x 100 nm patch to become oxidized, the so-called half life. This yields the average number of grams oxidized with water vapor per day, per unit meter 2 in an 85/85 environment. To convert to Attorney Docket SP06-180
- LLT materials which have low liquidus temperatures to form a barrier layer with permeation properties comparable to the bulk material itself.
- the LLT materials include, but are not limited to, tin fluorophosphate glass, chalcogenide glass, borosilicate glass, tellurite glass, phosphate glass, and borate glass, materials containing both glass and crystalline components, as well as other materials responsive to an annealing treatment. These LLT materials are especially suitable for inhibiting oxygen or/and moisture degradation common to electronic devices, food or medicine.
- these LLT Attorney Docket SP06-180 are especially suitable for inhibiting oxygen or/and moisture degradation common to electronic devices, food or medicine.
- the LLT materials may be used to reduce, for example, photochemical, hydrolytic, and oxidative damage due to chemically active permeants.
- the LLT materials also act as a barrier to other gas or liquid materials that would otherwise propagate through the flexible substrate.
- the LLT materials may be deposited using one or more of the following methods such as sputtering, evaporation, spraying, pouring, frit-deposition, vapor-deposition, dip-coating, painting or rolling, spin-coating (for example). Defects in the LLT materials from the deposition step are removed by a consolidation step (heat treatment) in order to produce a pore-free, gas and liquid impenetrable protective coating on the device.
- the barrier layer is quite durable, exhibiting low weight loss (0.28%) in standardized 1000 hour, 85 0 C water- immersion tests, and enduring over 600 hours in calcium patch tests, in 85 0 C and 85% relative humidity chambers.
- the consolidation step is truly practical with the LLT materials where the consolidation temperature is sufficiently low to inhibit thermal damage to nearby layers.
- the 1 glass target has all divalent tin (i.e., Sn 2+ ); while, the sputter-deposited thin film material is composed of about 66% Sn 4+ and 34% Sn 2+ .
- Sn 2+ divalent tin
- the sputter-deposited thin film material is composed of about 66% Sn 4+ and 34% Sn 2+ .
- the tin oxidation state is driven to approximately 100% tetravalent tin (i.e., Sn 4+ ). It is believed that this difference in the Sn changes the stoichiometric composition and as a result the Tg of the deposited and heat treated composition no. 1 film.
- tin pyrophosphate powder was put into an evaporative heating boat in a vacuum chamber and pumped down to a 10 ⁇ -6 Torr vacuum. The boat was then heated with approximately 80 Watts electrical power before we started evaporating the material onto a substrate. The deposited material was then heated at 120°C for one hour in vacuum. Then, a hermeticity experiment was conducted on the resulting film and it was found that the stoichiometric composition of the material was maintained through-out the entire process. This includes both the deposited film and the heated-deposited-film. [0043] It has also been shown herein that barrier layers containing a subset of durable low liquidus temperature materials provide substantial protection from oxygen and water attack (and transport) beyond traditional physically-deposited oxide barrier layers.
- the preferred barrier layers described herein can have a water and oxygen permeance below 10 ' g/m 2 /day and 10 "5 cc/m 2 /atm/day, respectively.
- physically-deposited low liquidus temperature thin-film barrier layers can be annealed at temperatures suitable for retaining the integrity of adjoining organic layer material physicochemical properties.
- This last feature makes durable low liquidus temperature materials unique compared with other physically deposited oxide barrier layers.
- These low liquidus temperature materials can be annealed at a low temperature so as to remove mesoscopic defects from the physically deposited layers and also retain the physicochemical properties of the adjoining organic under-layers. This is in contrast to the VitexTM method in which the defects are not removed.
- these low liquidus temperature barrier layers can be used to form an integral part of various devices (e.g., waveguide, grating sensors, photonic crystals etc.) while inhibiting the transport of materials detrimental to high-performance operation.
- devices e.g., waveguide, grating sensors, photonic crystals etc.
- tin fluorophosphate glass, borate glass and tellurite glass are discussed and described in detail herein, it should be appreciated that other types of
- LLT materials may also be used in accordance with the present invention. It should also be appreciated that low liquidus temperature materials can be made which contain small- composite materials or other electro-optic dopants. These dopants can optimize the refractive indices or add additional electro-optic features to a device 200. This can be particularly, useful when the device 200 is a waveguide sensor. Attorney Docket SP06-180
- FIGURE 7 illustrates a device 1000 that includes a device layer 1004, such as an electronic device, a display device, an optoelectronic device, etc., hermetically sealed between an encapsulant 1002 and a barrier layer 1006 (which may be formed from an inorganic material as is described in the remainder of this description).
- a device layer 1004 may actually consist of multiple layers.
- the encapsulant 1002 may be sintered LLT material, an inorganic barrier, and the like.
- the device layer 1004 may also be encapsulated on the top by an additional substrate 1008 and barrier layer 1006 thereby forming a symmetrical structure.
- the inorganic barrier layer 1006 covers at least a portion of a surface of a mechanically flexible or durable substrate 1008.
- the flexible substrate 1008 may have the capability to bend to radii of less than about 20 cm, less than about 10 cm or less than about 1 cm.
- Another inorganic barrier layer 1010 may cover another, opposing surface of the mechanically flexible or durable substrate 1008.
- the inorganic barrier layers 1006 and 1010 protect the substrate 1008 and the device 1004 from oxygen, moisture, or other gas or liquid components.
- barrier layer 1006, and barrier layer 1010 may consist of the same or different materials and may also consist of multiple layers.
- the embodiments of the invention illustrated in FIGURES 7-13 and described below also exploit the thin film nature of low melting glass (LMG) hermetic-sealing organic-electronic materials described above with respect to FIGURES 1-6 in the formation of the barrier coated flexible substrate 1008.
- LMG refers to materials previously mentioned as LLT.
- the barrier 1006 is formed from a hermetic thin LMG film layer (transparent or otherwise) that is thin enough to form a flexible structure. For example the LMG thickness allows the film to bend without fracturing.
- LMG may refer to inorganic materials that can be sintered or thermally treated at temperatures below the decomposition temperature of the supporting flexible substrate 1008. This enables the application of the inorganic barrier layer 1006 to the flexible substrate 1008 and then sintering to significantly improve the hermeticity.
- the flexible substrate 1008 may include materials such as polymer Attorney Docket SP06-180
- barrier layer 1006 film or composites whose barrier properties can be improved with the application of a barrier layer 1006.
- the basic process for forming the barrier layer 1006 onto the substrate includes the process techniques described with reference to FIGURES 1-2; however, additional description thereof is now provided.
- the barrier layer(s) 1006 is applied using, for example, sputtering, thermal evaporation, e-beam evaporation, other vacuum deposition methods, electrophoretic deposition, as well as non-vacuum deposition methods.
- the composition of the deposition target may or may not be the same resulting material composition that ultimately gets deposited onto the substrate surface 1008.
- the thickness of the barrier layer may be from about 0.1 ⁇ m or less to about 10 ⁇ m, with desired ranges being less than about 10 ⁇ m, less than about 5 ⁇ m, or less than about 2 ⁇ m. It is noted that greater or lesser thicknesses are also contemplated.
- a thermal treatment is performed to sinter / consolidate / anneal the applied barrier material 1006.
- the sintering temperature of the barrier layer 1006 would ideally be greater than any subsequent device fabrication temperatures and less than one or more thermal characteristics (e.g., critical thermal point) of the substrate 1008, such as the Tg, the softening point, a failure point, etc., of the substrate 1008 material. More specifically, the process of thermally treating the barrier layer 1006 would ideally not cause the substrate 1008 to reach one of these critical thermal points. In general, the properties of the barrier material will be bracketed by the capability of the substrate 1008 on one extreme and the requirements of the device fabrication process on the other. "Low Tg glass”, “low liquidus temperature material”, “low melting glass”, or other terms used in reference to the barrier material are with respect to the substrate thermal characteristics.
- the barrier layer 1006 must be processed under conditions that do not destroy the substrate 1008 and yet be able to survive the processing conditions required to fabricate the device 1004. Attorney Docket SP06-180
- FIGURES 8A-B depict a model of a general design of the substrate 1008 and one or more barrier layers 1006 disposed thereon.
- FIGURE 8 A illustrates the distance(s) between one or more barrier layers 1006 (and/or device layers 1004) and a neutral axis of the substrate 1008.
- FIGURE 8B depicts the aforementioned affect of stress on the substrate 1008 and the barrier layer 1006.
- Figure 8B shows a simplified calculated relationship between the resulting tensile or compressive stress in a given layer with respect to bend radius, the material modulus, and the distance from the structure neutral axis.
- Some factors that significantly affect the bending stress in the barrier layer 1006 include the barrier layer modulus and the distance from the stress-free neutral axis to the barrier layer 1006.
- the thicknesses of the various layers in the substrate 1008 and barrier layer 1006 as well as the modulus values will affect the placement of the neutral axis.
- additional stresses due to thermal expansions, thin film depositions, annealing steps, etc. also need to be taken into account.
- the stresses in a bent substrate-barrier product will be different before and after the device is fabricated on the barrier layer 1006. For example, bending a structure that consists of a substrate 1008 and a barrier layer 1006 will produce different stress levels than bending a structure that also includes device layer 1004.
- FIGURES 9 A and 9B depict examples of the effects of the barrier layer 1006 modulus and thickness, respectively, on the tensile stress of the barrier layer 1006.
- FIGURE 9A includes graphs of stress 1204 (in MPa) as a function of Glass Modulus 1202 (in GPa) for both a single-sided 1206 barrier layer product and a double-sided 1208 barrier layer product.
- FIGURE 9B includes graphs of stress 1204 (in MPa) as a function of glass thickness 1212 (in micrometers) for both a single-sided 1206 barrier layer product and a double-sided 1208 barrier layer product.
- the single-sided example refers to a barrier layer 1006 existing on the side of the substrate 1008 that experiences tensile stress.
- the double- sided example refers to a substrate 1008 that has both barrier layer 1006 and barrier layer 1010.
- the curves of FIGURES 9A and 9B will be different for different substrates 1008 and barrier layer 1006 and 1010 materials and thicknesses.
- the curves represent the hypothetical characteristics of a polymer film substrate 1008 of 50 ⁇ m thickness and 5 GPa modulus and a hypothetical barrier layer 1006 having a thickness of 2 ⁇ m (variable) a modulus of 70 GPa (variable), both bent to a radius of 2 cm.
- barrier layer 1010 has the same thickness and properties as barrier layer 1006.
- FIGURE 9A it is assumed that the thicknesses of the barrier layers 1006 and 1010 if present are held fixed at 2 ⁇ m and their modulus 1202 is varied. As the moduli 1202 of the barrier layers 1006 and 1010 decrease, the tensile stress 1204 at the barrier layer 1006 also decreases. With reference to FIGURE 9B, it is assumed that the moduli of the barrier layers 1006 and 1010 if present are fixed at 70 GPa and that their thicknesses 1212 are varied. As the thicknesses 1212 of the barrier layers 1006 and 1010 decrease, the tensile stress at the barrier layer 1006 also decreases. For a double sided coated substrate 1008, this decrease in tensile stress continuous monotonically.
- FIGURES 9A-9B may be employed to select a thickness and modulus for a given barrier layers 1006 and 1010 (if present) material on a given substrate 1008 of known thickness and modulus. More specifically, a target stress is determined and then FIGURES 9A-9B are consulted to determine the modulus and thickness of the barrier layer 1006 to achieve that stress. Again, depending on materials used and the properties of the substrate 1008, the thickness of the barrier layer 1006 may be less than about 10 ⁇ m, less than about 5 ⁇ m, or less than about 2 ⁇ m. Desired modulus ranges for the barrier layer 1006 may be from about 30-120 GPa, about 30-80 GPa, or about 30-50 GPa.
- TABLE 4 lists several materials that may be used to form the barrier layer and modulus, hardness and annealing temperatures for each.
- the modulus and hardness values were obtained by using a nano-indenter. Note that the annealing temperatures listed are defined in terms of bulk material viscosity and are not necessarily the same temperatures required to thermal treat deposited barrier layers. TABLE 4 properties of barrier materials
- FIGURE 10 is a graph 1300 that illustrates the hermetic properties of the substrate and several different materials from which the barrier layer 1006 may be formed.
- the diffusion of Helium (He) through the barrier layer 1006 and the substrate 1008 was measured over time.
- the diffusion of He through 75 ⁇ m thick 0211 glass was measured and compared to the diffusion of He through:
- Composition 1 Table 2A
- PEN DuPont Teijin, Hopewell, VA, www.
- Examples of applied barrier layers 1006 include: Composition 1, bismuth zinc borate Composition 5 (Table 2A), Corning Incorporated code 7070 glass, tellurite glasses, and other compositions capable of being applied and thermally sintered at a temperature compatible with the substrate 1008.
- the composition of Corning Incorporated Code 7070 glass is about 72 parts SiO 2 , about 1 part Al 2 O 3 , about 25 parts B 2 O 3 , about 0.5 parts Li 2 O, about 0.5 parts Na 2 O, and about 1 part K 2 O.
- the substrate 1008 can be any flexible, durable material that would benefit from improved barrier properties. Examples of substrate materials include Kapton® polyimide (Dupont, www.dupont.com), PEN, silicone composites, and other flexible film materials.
- Corning Incorporated code 7070 glass was sputtered onto a polished silicon wafer to a thickness of 0.430 ⁇ m, with the process parameters including: RF power 300 W, Ar flow 25 seem, pressure 4 mtorr, and deposition time 90 minutes.
- the resulting wafer was cleaved into several pieces, and each piece was sintered in a furnace at different temperatures (in air).
- the sintering temperatures included 100, 150, 200, 300, 400, 500, and 600 degrees C (along with a room temperature baseline sample).
- the thermal profile included a 5 C/min ramp, a 1 hour hold, and an uncontrolled cooling to less than 90 degrees C.
- defects in the sputtered films were observed to be reduced starting at the 100 degree C sintering. At the 300 degree C sintering, defects present due to sputtering were not visually observed.
- FIGURE 1 IA includes graphs of the Youngs modulus (E) 1404 (in GPa) versus thermal treatment temperature 1402 (in degrees Celsius) for Corning code 7070 film
- composition 1 film 1424 composition 1 bulk material 1426
- Corning code 7070 Attorney Docket SP06-180
- FIGURE 1 IB illustrates the hardness (H) 1414 (in GPa) versus thermal treatment temperature 1412 (in degrees Celsius), of Corning code 7070 film 1422, Composition 1 film 1424 (described in Table 2A), composition 1 bulk material 1426, and Corning code 7070 bulk material 1428.
- the composition 1 film 1424 and Corning Incorporated code 7070 film 1422 were sputtered onto silicon wafers and then sintered at varying temperatures. These values were obtained through nano-indentation techniques.
- the Corning Incorporated code 7070 film was sputtered using an RF power of 30 W, an Ar flow of 19 seem, a pressure of 2 mtorr, and a duration of 13 hours.
- the average Composition 1 (Table 2A) thickness was 1.5 ⁇ m, and the average 7070 thickness was 0.4 ⁇ m. Also noted on the graphs are the Young's modulus 1404 and hardness 1414 values for the Composition 1 bulk material 1426 (Table 2A) and the code 7070 bulk material 1428. It can be seen that the code 7070 modulus increases with temperature up until the possible consolidation temperature. The code 7070 hardness continued to increase. [0062]
- the above curves (or similarly obtained curves using other materials and conditions) may be used to produce a modulus or hardness gradient in the barrier layer 1006 with an appropriate thermal treatment. For example, a degree of heat treatment / sintering may be varied through the thickness of the barrier layer 1006 to achieve the modulus gradient.
- laser sintering can be used to vary the sintering effect on the upper thickness of the barrier layer 1006 as opposed to the lower thickness thereof.
- the thermal treatment of the barrier layer 1006 may be varied during the deposition process. For example, different depths of the barrier layer 1006 may be thermally treated differently.
- the modulus, hardness, or other mechanical properties can be optimized during the thermal treatment step.
- the barrier layer 1006 is generally thicker prior to sintering. After sintering, the thickness of the barrier layer 1006 is reduced.
- the barrier layers 1006 described above create a continuous layer on the substrate 1008, which may be susceptible to brittle fractures. Along with minimizing the stress levels in the layers, stress concentration points may also be minimized to achieve high quality hermetic products. Stress concentrations where fracture of the barrier layer 1006 can occur include edge defects and surface defects / roughness in the barrier layer 1006 or originating in the substrate 1008. Specifically, poor edge quality can limit the mechanical durability of the Attorney Docket SP06-180
- Fractures in the barrier layer 1006 can propagate to the device 1004 or reduce the hermetic properties.
- FIGURE 12 is a top-view of a flexible substrate 1008, comprising a 1-2 ⁇ m Composition 1 (Table 2A) glass layer sputtered onto a 125 ⁇ m thick PEN substrate.
- the edge of the substrate 1008 is shown after bending, and cracks are seen propagating from the edge defects.
- FIGURE 13 illustrates a technique for creating a substrate 1008 having a high strength edge with reduced defects.
- FIGURE 13 A shows polymeric support (substrate) 1008 with a glass barrier (barrier layer) 1006 deposited thereon.
- the barrier layer 1006 has contoured (e.g., rounded) or otherwise low defect level edges that are formed through shadow masking (patterning), sintering, etching, or other methods that create low defect level edges in the barrier layer 1006.
- barrier layer 1006 is deposited on only a portion or portions of the substrate 1008 to form runs 1606 on which no barrier layer 1006 exists.
- the deposited barrier layer 1006 can also be formed away from an edge 1602 of the substrate 1008 such that the edge region of the substrate 1008 is totally devoid of any barrier layer 1006.
- the substrate 1008 may be cut through the runs 1606 without affecting edge quality or strength of the barrier layer 1006 .
- These runs 1606 may form two-dimensional patterns on the substrate 1008 to produce areas in which individual devices 1004 may be separated from each other.
- barrier coating flexible substrates may include a single deposition step followed by a thermal sintering.
- alternative prior art multi-layer barrier techniques require several vacuum deposition steps each with their associated yield.
- High thermal capability - The barrier layer composition can be tuned to fit the required device fabrication process and final application. This includes the ability to shift the thermal capability as needed. In comparison, alternative prior art multi-layer barrier approaches incorporate an organic layer that will limit their thermal capability.
- barrier layer composition and the process used to apply and sinter it can be modified to control the resulting mechanical properties. This is not easily achieved in alternative prior art barrier technologies. Additionally, one or more embodiments of the invention employ techniques to pattern the barrier layer to avoid cutting issues or other steps that would reduce the mechanical strength thereof. Overall, this allows control of the barrier layer 1006 mechanical properties in both the vertical and horizontal directions.
- the barrier layer 1006 deposited onto the flexible substrate 1008 is able to seal directly to the top encapsulating layer 1002.
- the intermediate organic layers cause edge seal issues. Specifically, oxygen and moisture can propagate in these organic layers at the edge and reduce the device hermeticity.
- composition of the barrier layer can also be modified to be compatible with the device chemical processing requirements. Specifically, the compatibility of the barrier layer 1006 to acids, bases, water, organic solvents, and other processing environments can be optimized as needed.
- Improved barrier performance creates an improved device barrier in a single layer.
- the composition selection allows sintering and consolidation at acceptable temperatures to significantly reduce (or eliminate) pinholes, inherent porosity, or other defects that would reduce the hermeticity. This technique is not possible with traditional
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Abstract
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CN2007800436517A CN101542771B (en) | 2006-11-30 | 2007-11-26 | Flexible substrates having a thin-film barrier |
JP2009539287A JP2010511975A (en) | 2006-11-30 | 2007-11-26 | Flexible substrate with thin film barrier |
KR1020157005225A KR101603877B1 (en) | 2006-11-30 | 2007-11-26 | Flexible substrates having a thin-film barrier |
EP07870912A EP2087538A2 (en) | 2006-11-30 | 2007-11-26 | Flexible substrates having a thin-film barrier |
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US87200806P | 2006-11-30 | 2006-11-30 | |
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EP (1) | EP2087538A2 (en) |
JP (1) | JP2010511975A (en) |
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CN (1) | CN101542771B (en) |
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Also Published As
Publication number | Publication date |
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KR20090096483A (en) | 2009-09-10 |
US20090121333A1 (en) | 2009-05-14 |
US20120045567A1 (en) | 2012-02-23 |
US8435605B2 (en) | 2013-05-07 |
US8115326B2 (en) | 2012-02-14 |
CN101542771B (en) | 2011-04-13 |
KR20150030779A (en) | 2015-03-20 |
WO2008069930A3 (en) | 2009-03-05 |
KR101603877B1 (en) | 2016-03-15 |
CN101542771A (en) | 2009-09-23 |
TW200841500A (en) | 2008-10-16 |
EP2087538A2 (en) | 2009-08-12 |
JP2010511975A (en) | 2010-04-15 |
KR101589313B1 (en) | 2016-01-28 |
TWI389367B (en) | 2013-03-11 |
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