RF-INTEGRATED POWER STATE CAPER

Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to creating an integrated RF power conditioning capacitor.BACKGROUND OF THE INVENTION

[0002] Without limiting the scope of the invention, its background is described in connection with power condition capacitors.

[0003] RF devices are using higher and higher power. This class of RF devices produce pulses at voltages greater that 10 V and at currents greater than 2 Amps. Switching the signal on and off at this level of current and voltage creates a significant amount of harmonic signals. These harmonic signals can disrupt the operation of the circuit. Large value integrated silicon based capacitors fail to achieve the required capacitance and suffer from dielectric breakdown.SUMMARY OF THE INVENTION

[0004] In previous work and research, that is not part of the present invention, the inventors have developed integrated photodefinable glass-ceramics that can be converted from a glass phase to a ceramic phase through a combination of ultraviolet light exposure and thermal treatments. The selective application of the ultraviolet light exposure using a photo mask or shadow mask creates regions of ceramic material in the photodefinable glass.

[0005] According to the present invention, a method of making an integrated large capacitance in a small form factor for power conditioning on a photodefinable glass substrate includes: depositing a conductive seed layer on a photodefinable glass substrate processed to form one or more via openings in the photodefinable glass substrate; placing the photodefinable glass substrate with a metallized seed layer electroplating metal to fill one or more openings in the photodefinable glass substrate to form vias; chemically-mechanically polishing a front and a back surface of the photodefinable glass substrate to leave only the filled vias; exposing and converting at least one rectangular portion of the photodefinable glass substrate around two adjacent filled vias; etching the rectangular portion exposing at least one pair of adjacent filled vias to form metal posts; flash coating a non-oxidizing layer on the metal posts that form a first electrode; depositing a dielectric layer on or around the posts; metal coating the dielectric layer to form a second electrode; connecting a first metal layer to all of the first electrodes in parallel to form a single electrode for a capacitor; and connecting a second metal layer to all of the second electrodes in parallel to form a second electrode for the capacitor. Further advantageous aspects are featured in the dependent claims. In one aspect, the dielectric layer is a thin film between 0.5 nm and 1000 nm thick. In another aspect, the dielectric layer is a sintered paste between 0.05 µm and 100 µm thick. In another aspect, the dielectric layer has an electrical permittivity between 10 and 10,000. In another aspect, the dielectric layer has an electrical permittivity between 2 and 100. In another aspect, the dielectric layer is deposited by ALD. In another aspect, the dielectric layer is deposited by doctor blading. The resulting capacitor may have a capacitance density greater than 1,000 pf / mm 2< .

[0006] In this paragraph, an example is disclosed for explanatory purposes only, this method is not part of the present invention. This method of making an integrated large capacitance in a small form factor for power conditioning on a photodefinable glass substrate includes: masking a circular pattern on the photosensitive glass substrate; exposing at least one portion of the photosensitive glass substrate to an activating UV energy source; heating the photosensitive glass substrate to a heating phase of at least ten minutes above its glass transition temperature; cooling the photosensitive glass substrate to transform at least part of the exposed glass to a crystalline material to form a glass - ceramic crystalline substrate; partially etching away the ceramic phase of the photodefinable glass substrate with an etchant solution; depositing a conductive seed layer on the photodefinable glass; placing the photodefinable glass substrate with a metallized seed layer electroplating metal to fill one or more openings in the photodefinable glass substrate to form vias; chemically-mechanically polishing a front and a back surface of the photodefinable glass substrate to leave only the filled vias; exposing and converting at least one rectangular portion of the photosensitive glass substrate around two adjacent filled vias; etching the rectangular patent exposing at least one pair of adjacent filled vias to form metal posts; flash coating a non-oxidizing layer on the metal posts that form a first electrode; depositing a dielectric layer on or around the posts; metal coating the dielectric layer to form a second electrode; connecting a first metal layer to all of the first electrodes in parallel to form a single electrode for a capacitor; and connecting a second metal layer to all of the second electrodes in parallel to form a second electrode for a capacitor. In one aspect, the dielectric layer is a thin film between 0.5 nm and 1000 nm thick. In another aspect, the dielectric layer is a sintered paste between 0.05 µm and 100 µm thick. In another aspect, the dielectric layer has an electrical permittivity between 10 and 10,000. In another aspect, the dielectric layer has an electrical permittivity between 2 and 100. In another aspect, the dielectric layer is deposited by ALD. In another aspect, the dielectric layer is deposited by doctor blading. In another aspect, the capacitor has a capacitance density greater than 1,000 pf / mm 2< .

[0007] In this paragraph, an example is disclosed for explanatory purposes only, that is not part of the present invention. This method including: masking a circular pattern on a photosensitive glass substrate; exposing at least one portion of the photosensitive glass substrate to an activating UV energy source; heating the photosensitive glass substrate to a heating phase of at least ten minutes above its glass transition temperature; cooling the photosensitive glass substrate to transform at least part of the exposed glass to a crystalline material to form a glass - ceramic crystalline substrate; partially etching away the ceramic phase of the photodefinable glass substrate with an etchant solution; depositing a conductive seed layer on the photodefinable glass; placing the photodefinable glass substrate with a metallized seed layer electroplating metal to fill one or more openings in the photodefinable glass substrate to form vias; chemically-mechanically polishing a front and a back surface of the photodefinable glass substrate to leave only the filled vias; exposing and converting at least one rectangular portion of the photosensitive glass substrate around two adjacent filled vias; etching the rectangular patent exposing at least one pair of adjacent filled vias to form metal posts; flash coating a non-oxidizing layer on the metal posts that form a first electrode; depositing a dielectric layer on or around the posts; metal coating the dielectric layer to form a second electrode; connecting a first metal layer to all of the first electrodes in parallel to form a single electrode for a capacitor; and connecting a second metal layer to all of the second electrodes in parallel to form a second electrode for the capacitor. In one aspect, the dielectric layer is a thin film between 0.5 nm and 1000 nm thick. In another aspect, the dielectric layer is a sintered paste between 0.05 µm and 100 µm thick. In another aspect, the dielectric material has an electrical permittivity between 10 and 10,000. In another aspect, the dielectric thin film has an electrical permittivity between 2 and 100. In another aspect, the dielectric thin film material is deposited by ALD. In another aspect, the dielectric paste material is deposited by doctor blading. In another aspect, the capacitor has a capacitance density greater than 1,000 pf / mm 2< .BRIEF DESCRIPTION OF THE DRAWINGS

[0008] For a more complete understanding of the features and advantages of the present invention, reference is now made to the detailed description of the invention along with the accompanying figures and in which: FIG. 1 shows the image of copper electroplated filled through hole via with seed layer. FIG. 2A shows a cross section of the RF power conditioning capacitor and the materials key where the dielectric material is HfO 2 . FIG. 2B shows a top view of the RF power conditioning capacitor. FIG. 3 shows a BaTiO 3 based integrated power condition capacitor. FIG. 4 shows a through hole via with 65 µm diameter, 72 µm center-to-center pitch. DETAILED DESCRIPTION OF THE INVENTION

[0009] While the making and using of various embodiments of the present invention are discussed in detail below, it should be appreciated that the present invention provides many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed herein are merely illustrative of specific ways to make and use the invention and do not delimit the scope of the invention. The invention is limited by the scope of the claims.

[0010] To facilitate the understanding of this invention, a number of terms are defined below. Terms defined herein have meanings as commonly understood by a person of ordinary skill in the areas relevant to the present invention. Terms such as "a", "an" and "the" are not intended to refer to only a singular entity, but include the general class of which a specific example may be used for illustration. The terminology herein is used to describe specific embodiments of the invention, but their usage does not limit the invention, except as outlined in the claims.

[0011] Photodefinable glass materials are processed using first generation semiconductor equipment in a simple three step process where the final material can be fashioned into either glass, ceramic, or contain regions of both glass and ceramic. Photodefinable glass has several advantages for the fabrication of a wide variety of microsystems components, systems on a chip and systems in a package. Microstructures and electronic components have been produced relatively inexpensively with these types of glass using conventional semiconductor and printed circuit board (PCB) processing equipment. In general, glass has high temperature stability, good mechanical and electrically properties, and a better chemical resistance than plastics as well as many types of metals.

[0012] When exposed to UV-light within the absorption band of cerium oxide, the cerium oxide acts as a sensitizer by absorbing a photon and losing an electron. This reaction reduces neighboring silver oxide to form silver atoms, e.g.,         Ce 3+< + Ag +< = □Ce 4+< + Ag 0<

[0013] The silver ions coalesce into silver nano-clusters during the heat treatment process and induce nucleation sites for the formation of a crystalline ceramic phase in the surrounding glass. This heat treatment must be performed at a temperature near the glass transformation temperature. The ceramic crystalline phase is more soluble in etchants, such as hydrofluoric acid (HF), than the unexposed vitreous, amorphous glassy regions. In particular, the crystalline [ceramic] regions of FOTURAN ®< are etched about 20 times faster than the amorphous regions in 10% HF, enabling microstructures with wall slope ratios of about 20:1 when the exposed regions are removed. See T. R. Dietrich et al., "Fabrication technologies for microsystems utilizing photoetchable glass," Microelectronic Engineering 30, 497 (1996), which is incorporated herein by reference. Other compositions of photodefinable glass will etch at different rates.

[0014] One method of fabricating a metal device using a photosensitive glass substrate-comprised of silica, lithium oxide, aluminum oxide and cerium oxide-involves the use of a mask and UV light to create a pattern with at least one, 2-dimensional or 3-dimensional, ceramic phase region within the photosensitive glass substrate.

[0015] Preferably, the shaped glass structure contains at least one or more, two or three dimensional inductive device. The capacitive device is formed by making a series of connected structures to form a high surface area capacitor for power condition. The structures can be either rectangular, circular, elliptical, fractal or other shapes that create a pattern that generates capacitance. The patterned regions of the APEX ™< glass can be filled with metal, alloys, composites, glass or other magnetic media, by a number of methods including plating or vapor phase deposition. The electrical permittivity of the media combined with the dimensions, high surface area and number of structures in the device provide the inductance of devices. Depending on the frequency of operation the inductive device design will require different magnetic permittivity materials, so at higher frequency operations material such as copper or other similar material is the media of choice for inductive devices. Once the capacitive device has been generated the supporting APEX ™< glass can be left in place or removed to create an array of capacitive structures that can be attached in series or in parallel.

[0016] This process can be used to create a large surface area capacitor that will exceed the desired technical requirements for an integrated power conditioning capacitance density with values of greater than or equal to 1nf per mm 2< . There are different device architectures based on the relative permittivity used and the preferred deposition technique for the dielectric material. This disclosure provides a method to create a device architectures for each dielectric material.

[0017] Generally, glass ceramics materials have had limited success in microstructure formation plagued by performance, uniformity, usability by others and availability issues. Past glass-ceramic materials have yielded an etch aspect-ratio of approximately 15:1, in contrast APEX ®< glass has an average etch aspect ratio greater than 50:1. This allows users to create smaller and deeper features. Additionally, our manufacturing process enables product yields of greater than 90% (legacy glass yields are closer to 50%). Lastly, in legacy glass ceramics, approximately only 30% of the glass is converted into the ceramic state, whereas with APEX ®< glass ceramic this conversion is closer to 70%.

[0018] The APEX ®< composition provides three main mechanisms for its enhanced performance: (1) the higher amount of silver leads to the formation of smaller ceramic crystals which are etched faster at the grain boundaries, (2) the decrease in silica content (the main constituent etched by the HF acid) decreases the undesired etching of unexposed material, and (3) the higher total weight percent of the alkali metals and boron oxide produces a much more homogeneous glass during manufacturing.

[0019] Ceramicization of the glass is accomplished by exposing the entire glass substrate to approximately 20J / cm 2< of 310nm light. When trying to create glass spaces within the ceramic, users expose all of the material, except where the glass is to remain glass. In one embodiment, the present invention provides a quartz / chrome mask containing a variety of concentric circles with different diameters.

[0020] Previous high surface area capacitors demonstrated by the inventors use thin film metalized via using a CVD process. The metalized via is then coated with a thin film of dielectric material such as a 20 nm layer of Al 2 O 3 using an ALD process then applying a top metallization to make a large capacitance due to the effect surface area of the via(s) and the ultra thin coating of the dielectric.

[0021] For explanatory purposes, a comparable method for fabricating an inductive device in or on glass ceramic structure electrical microwave and radio frequency applications is discussed. The glass ceramic substrate may be a photosensitive glass substrate having a wide number of compositional variations including but not limited to: 60 - 76 weight % silica; at least 3 weight % K 2 O with 6 weight % - 16 weight % of a combination of K 2 O and Na 2 O; 0.003-1 weight % of at least one oxide selected from the group consisting of Ag2O and Au2O; 0.003-2 weight % Cu 2 O; 0.75 weight % - 7 weight % B2O3, and 6 - 7 weight % Al 2 O 3 ; with the combination of B 2 O 3 ; and Al 2 O 3 not exceeding 13 weight %; 8-15 weight % Li 2 O; and 0.001 - 0.1 weight % CeO 2 . This and other varied compositions are generally referred to as the APEX ®< glass.

[0022] The exposed portion of the glass may be transformed into a crystalline material by heating the glass substrate to a temperature near the glass transformation temperature. When etching the glass substrate in an etchant such as hydrofluoric acid, the anisotropic-etch ratio of the exposed portion to the unexposed portion is at least 30:1 when the glass is exposed to a broad spectrum mid-ultraviolet (about 308-312 nm) flood lamp to provide a shaped glass structure that has an aspect ratio of at least 30:1, and to create an inductive structure. The mask for the exposure can be of a halftone mask that provides a continuous grey scale to the exposure to form a curved structure for the creation of an inductive structure / device. A digital mask can also be used with the flood exposure and can be used to produce the creation of an inductive structure / device. The exposed glass is then baked, typically in a two-step process. Temperature range heated between 420°C-520°C for between 10 minutes to 2 hours, for the coalescing of silver ions into silver nanoparticles and temperature range heated between 520°C-620°C for between 10 minutes and 2 hours allowing the lithium oxide to form around the silver nanoparticles. The glass plate is then etched. The glass substrate is etched in an etchant, of HF solution, typically 5% to 10% by volume, wherein the etch ratio of exposed portion to that of the unexposed portion is at least 30:1 when exposed with a broad spectrum mid-ultraviolet flood light, and greater than 30:1 when exposed with a laser, to provide a shaped glass structure with an anisotropic-etch ratio of at least 30:1. FIG. 1 shows the image of copper electroplated filled through hole via with seed layer.

[0023] A method of making an integrated capacitor on a photodefinable glass substrate leads to capacitive structures created in the multiple metal posts in a glass-ceramic substrate, such process employing the photodefinable glass structure in a wafer containing at least one or more, two or three-dimensional capacitor device. The photodefinable glass wafer can range from 50 µm to 1,000 µm, in our case preferably 250 µm. The photodefinable glass is then patterned with a circular pattern and etched through the volume of the glass. The circular pattern can range from 5 µm to 250 µm in diameter but is preferably 30 µm in diameter. A uniform titanium seed layer is deposited across the wafer including the vias by a CVD process. The seed layer thickness can range from 50 nm to 1000 nm but is preferably 150 nm in thickness. The wafer is then placed into an electroplating bath where copper (Cu) is deposited on the seed layer. The copper layer needs to be sufficient to fill the via, in this case 25 µm. The front side and backside of the wafer is the lapped and polished back to the photodefinable glass. This can be seen in FIG. 2A. A rectangular pattern is made in the photodefinable glass using the process described earlier to convert between 10% and 90% of the glass, preferably 80% of the volume of the photodefinable glass. The via may also receive an additional low concentrated rinse, with an etchant, such as dilute HF. The dilute HF will pattern or texture the ceramic wall of the via. The texturing of the ceramic wall significantly increases the surface area of the structure, directly increasing the capacitance of the device. The photodefinable glass with the exposed copper has a metalized polyimide is placed in physical / electrical contact to the copper filled via on the backside of the wafer. The metalized polyimide contacted photodefinable glass with the exposed copper columns are placed into a electroplating bath where a flash coating of non-oxidizing metal or a metal that forms a semiconductor oxide or conductive oxide is electroplated on the surface of the metal posts. This metal is preferably gold (Au). The thin flash coating prevents the oxidation of the copper posts during the deposition of the dielectric media / material. The dielectric is deposited using an atomic layer deposition (ALD) process to deposit a metal that can be oxidized or directly deposit a oxide material such as 10Å of the dielectric layer of Ta 2 O 5 , Al 2 O 3 or other vapor phase dielectrics including but not limited to Al 2 O3. Al 2 O 3 at 380 °C using TMA and O 3 - cycle time: 3.5 s. The Al 2 O 3 layer is then heated in oxygen ambient to 300°C for 5 min fully oxidized the dielectric layer. The thickness of this dielectric layer can range from 5 nm to 1000 nm. Our preferred thickness is 5 nm thick as can be seen in FIG 2A. Next a RLD of copper is deposited to fill the rectangular hole. The RLD is preferably a copper paste that is deposited by a silk screening process. The wafer is then placed into a furnace that is heated to between 450°C to 700°C for between 5 and 60 min in an inert gas or vacuum environment. Our preferred temperature and time is 600 °C for 20 min in argon gas. The last step is to make contact to the RLD copper making the front surface of the die into rows and backside of the wafer into columns. All of the rows on the front surface are tied together in parallel to make an electrode for a large integrated surface area capacitor. Similarly all of the columns on the back surface of the die are tied together in parallel to make a bottom electrode for a large integrated surface area capacitor. FIG. 2B shows a top view of the RF power conditioning capacitor.

[0024] Another method of making an integrated capacitor on a photodefinable glass substrate leads to capacitive structures created in the multiple metal posts in a glass-ceramic substrate as shown in Fig. 3, such process employing the photodefinable glass structure in a wafer containing at least one or more, two or three-dimensional capacitor device. The photodefinable glass wafer can range from 50 µm to 1,000 µm, in our case preferably 250 µm. The photodefinable glass is then patterned with a circular pattern and etched through the volume of the glass. The circular pattern can range from 5 µm to 250 µm in diameter but preferably 30 µm in diameter. A uniform titanium seed layer is deposited across the wafer including the vias by a CVD process. The seed layer thickness can range from 50 nm to 1000 nm, but is preferably 150 nm in thickness. The wafer is then placed into an electroplating bath where copper (Cu) is deposited on the seed layer. The copper layer needs to be sufficient to fill the via, in this case 25 µm. The front side and backside of the wafer is the lapped and polished back to the photodefinable glass. This can be seen in FIG. 3. A rectangular pattern is made in the photodefinable glass using the process described earlier to convert between 10% and 90% of the glass, preferably 80% of the volume of the photodefinable glass. The via may also receive an additional low concentrated rinse, with an etchant, such as dilute HF. The metalized polyimide contacted photodefinable glass with the exposed copper columns are placed into a electroplating bath where a flash coating of non-oxidizing metal or a metal that forms a semiconductor oxide or conductive oxide is electroplated on the surface of the metal posts. This metal is preferably gold (Au). The thin flash coating prevents the oxidation of the copper posts during the deposition of the dielectric media / material. A dielectric region is then created by use of commercially available BaTiO 3 paste that is silk-screened into the rectangular wells. The wafer is then placed into a furnace that is heated to between 450°C to 700°C for between 5 and 60 min in an oxygen ambient. A preferred temperature and time is 600 °C for 30 min in oxygen ambient. The last step is to make contact to the RLD copper making the front surface of the die into rows and backside of the wafer into rows that are parallel to the top electrodes. All of the rows on the front surface are tied together in parallel to make an electrode for a large integrated surface area capacitor. Similarly all of the rows on the back surface of the die are tied together in parallel to make a bottom electrode for a large integrated surface area capacitor.

[0025] FIG. 4 shows a through hole via with 65 µm diameter, 72 µm center-to-center pitch.

[0026] This method creates a cost effective glass ceramic three-dimensional capacitor structure or three-dimensional capacitor array device. Where a glass ceramic substrate has demonstrated capability to form such structures through the processing of both the vertical as well as horizontal planes either separately or at the same time to form two or three-dimensional capacitive devices.

[0027] The present disclosure includes a method to fabricate a substrate with one or more, two or three dimensional capacitor devices by preparing a photosensitive glass substrate with via or post and further coating or filling with one or more conductive layer typically a metal, dielectric material and a top layer conductive layer typically a metal.

[0028] It is contemplated that any embodiment discussed in this specification can be implemented with respect to any method, kit, reagent, or composition of the disclosure, and vice versa. Furthermore, compositions of the disclosure can be used to achieve methods of the disclosure.

[0029] All publications and patent applications mentioned in the specification are indicative of the level of skill of those skilled in the art to which this invention pertains.

[0030] The use of the word "a" or "an" when used in conjunction with the term "comprising" in the claims and / or the specification may mean "one," but it is also consistent with the meaning of "one or more," "at least one," and "one or more than one." The use of the term "or" in the claims is used to mean "and / or" unless explicitly indicated to refer to alternatives only or the alternatives are mutually exclusive, although the disclosure supports a definition that refers to only alternatives and "and / or." Throughout this application, the term "about" is used to indicate that a value includes the inherent variation of error for the device, the method being employed to determine the value, or the variation that exists among the study subjects.

[0031] As used in this specification and claim(s), the words "comprising" (and any form of comprising, such as "comprise" and "comprises"), "having" (and any form of having, such as "have" and "has"), "including" (and any form of including, such as "includes" and "include") or "containing" (and any form of containing, such as "contains" and "contain") are inclusive or open-ended and do not exclude additional, unrecited elements or method steps. In embodiments of any of the compositions and methods provided herein, "comprising" may be replaced with "consisting essentially of" or "consisting of". As used herein, the phrase "consisting essentially of" requires the specified integer(s) or steps as well as those that do not materially affect the character or function of the object or method As used herein, the term "consisting" is used to indicate the presence of the recited integer (e.g., a feature, an element, a characteristic, a property, a method / process step or a limitation) or group of integers (e.g., feature(s), element(s), characteristic(s), property(ies), method / process steps or limitation(s)) only.

[0032] The term "or combinations thereof" as used herein refers to all permutations and combinations of the listed items preceding the term. For example, "A, B, C, or combinations thereof" is intended to include at least one of: A, B, C, AB, AC, BC, or ABC, and if order is important in a particular context, also BA, CA, CB, CBA, BCA, ACB, BAC, or CAB. Continuing with this example, expressly included are combinations that contain repeats of one or more item or term, such as BB, AAA, AB, BBC, AAABCCCC, CBBAAA, CABABB, and so forth. The skilled artisan will understand that typically there is no limit on the number of items or terms in any combination, unless otherwise apparent from the context.

[0033] As used herein, words of approximation such as, without limitation, "about", "substantial" or "substantially" refers to a condition that when so modified is understood to not necessarily be absolute or perfect but would be considered close enough to those of ordinary skill in the art to warrant designating the condition as being present. The extent to which the description may vary will depend on how great a change can be instituted and still have one of ordinary skill in the art recognize the modified feature as still having the required characteristics and capabilities of the unmodified feature. In general, but subject to the preceding discussion, a numerical value herein that is modified by a word of approximation such as "about" may vary from the stated value by at least ±1, 2, 3, 4, 5, 6, 7, 10, 12 or 15%. All of the compositions and / or methods disclosed and claimed herein can be made and executed without undue experimentation in light of the present disclosure. While the compositions and methods of this disclosure have been described in terms of preferred embodiments, it will be apparent to those of skill in the art that variations may be applied to the compositions and / or methods and in the steps or in the sequence of steps of the method described herein without employing inventive skill. The scope of the invention is defined by the appended claims.

Claims

1. A method of making an integrated capacitor in a small form factor for power conditioning on a photodefinable glass substrate comprising: depositing a conductive seed layer on a photodefinable glass substrate processed to form one or more via openings in the photodefinable glass substrate; placing the photodefinable glass substrate with a metallized seed layer electroplating metal to fill one or more openings in the photodefinable glass substrate to form vias; characterized by chemically-mechanically polishing a front and a back surface of the photodefinable glass substrate to leave only the filled vias; exposing with UV-light and converting by heat treatment at least one rectangular portion of the photodefinable glass substrate around two adjacent filled vias; etching the rectangular portion exposing at least one pair of adjacent filled vias to form metal posts; flash coating a non-oxidizing layer on the metal posts that form a first electrode; depositing a dielectric layer on or around the metal posts; metal coating the dielectric layer to form a second electrode; connecting a first metal layer to all of the first electrodes in parallel to form a single electrode for a capacitor; and connecting a second metal layer to all of the second electrodes in parallel to form a second electrode for the capacitor.

2. The method of claim 1 wherein the dielectric layer is a thin film between 0.5 nm and 1000 nm thick.

3. The method of claim 1, wherein the dielectric layer is a sintered paste between 0.05 pm and 100 pm thick.

4. The method of claim 1, wherein the dielectric layer has an electrical permittivity between 10 and 10,000.

5. The method of claim 1, wherein the dielectric layer has an electrical permittivity between 2 and 100.

6. The method of claim 1, wherein the dielectric layer is deposited by ALD.

7. The method of claim 1, wherein the dielectric layer is deposited by doctor blading.