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Design and technology to manufacture integral micromechanical relay with movable electrode as structure with piezoelectric layer

Design and technology to manufacture integral micromechanical relay with movable electrode as structure with piezoelectric layer
IPC classes for russian patent Design and technology to manufacture integral micromechanical relay with movable electrode as structure with piezoelectric layer (RU 2481675):
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FIELD: electricity.

SUBSTANCE: method to manufacture an integral micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer, comprising a substrate, coated with a dielectric layer with a lower (fixed) electrode and a movable electrode, consisting serially of a lower current-conductive layer, a dielectric layer with high elastic properties, a medium current-conductive layer, a piezoelectric layer, an upper current-conductive layer, arranged on the surface of the above substrate is realised on the surface of silicon plates. Development of an integral micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer is carried out in a single process cycle with simplified manufacturing technology compatible with technology of production of integrated circuits, in which formation of a movable electrode is possible in the form of a cantilever or in the form of a beam and includes the following operations: formation of a film Si3N4 on the surface of the silicon substrate by the method of SiN4 pyrolysis; sputtering of a TiN layer and formation of a "lower electrode" structure by the method of projection photolithography and plasma-chemical etching of the TiN layer; deposition of a layer of PSG (phosphate-silicate glass) by the method of chemical deposition from a gas phase and formation of a sacrificial layer on its basis by the method of liquid chemical etching; sputtering of the first TiN layer; deposition of the dielectric layer Si3N4; sputtering of the second TiN layer; deposition of the piezoelectric layer of lead zirconate titanate (LZT); sputtering of the third TiN layer; plasma-chemical etching of the layers: the third TiN layer, the LZT layer, the second TiN layer, the Si3N4 layer, the first TiN layer with formation of a movable multilayer electrode and opening of the sacrificial layer of PSG, liquid chemical etching of the sacrificial PSG layer with formation of an air gap between a fixed and a movable electrodes.

EFFECT: increased reliability and extended service life of a micromechanical relay, using microelectronic technology for production of a micromechanical relay makes it possible to minimise device dimensions down to 20-80 mcm and to simplify technology of its production.

3 cl, 5 dwg

 

Description of the invention

The technical field

The invention relates to the field of electronic technology and can be used in the manufacture of devices microelectromechanical systems, in particular the integrated micromechanical relays and devices based on them: power switches, circuits, memory, sensors, information processing systems and other

The level of technology

Integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer can be manufactured in the form of a beam, comprising a stationary electrode and movable electrode beams, mounted on poles on both sides, made in the form of a structure with a piezoelectric layer, or as a console consisting of a stationary electrode and movable electrode, console mounted on the support with one hand, made in the form of a structure with a piezoelectric layer. Relay console enables operation at lower operating voltage than the relay in the form of a beam with the same dimensions of the movable electrode. The effectiveness of the integrated micromechanical relay is determined by the inverse piezoelectric effect, causing rolling movement of the electrode, which in turn depends on the material of the movable electrode, the applied voltage and distance between the electrodes. That the same efficiency micromechanical relay is determined by the flexibility and durability of the movable electrode, which is used in the structure of the movable electrode dielectric layers with high elastic properties.

Well-known piezoelectric properties of ferroelectrics, namely TSTS-19 (based on lead, lead zirconate, titanate). To ensure high mobility of the electrode must be made of a material with a pronounced inverse piezoelectric effect, which may provide films of ferroelectric, namely TSTS-19 (based on lead, lead zirconate, titanate).

One way to obtain a device with a movable element of the device is shown in the patent of Russian Federation №2193804, which describes the design, method of manufacture and characteristics of semiconductor thermomechanical microactuator, which is intended for use in the construction of a wide class of micromanipulators, including micro relays, consisting of a base, made in the form of a frame, an electric heater and element of the silicon-containing material, suspended in the window frame using at least one movable plate can be moved in the plane perpendicular to the plane of the frame, as a result of thermal expansion of the movable plate under the influence of an electric heater. The disadvantages of this device are unreliable and low is korost operation.

Another way of obtaining a piezoelectric relay is shown in patent No. RU2391736. Piezoceramic relay comprises a base, a fixed cantilever bimorph plate piezo with the contacts of the control circuit on the fixed end of the piezoelectric element and the contact of the switching circuit mounted on the free end of the piezoelectric element, interacting with the supply voltage on the contacts of the control circuit of the piezoelectric element to the other contact of the switching circuit. Moreover, the mentioned relay further comprises a mechanism for adjusting a gap between the mentioned electric contacts of the switching circuit, made in the form prescribed in the case of the cylindrical face of the Cam, with the possibility of rotation around the axis, and a spring-loaded lever, one end of which is fixed in the above-mentioned case of the clearance adjustment mechanism, and the second end of the lever is in kinematic connection with the said face Cam and contains the electrical contact of the switching circuit, interacting with others mentioned electric contact mounted on the movable end of the piezoelectric element. Working voltage of this device 18 In frequency 0-240 Hz. The disadvantages of the aforementioned devices are its large size (18×8×4 mm) and the complexity of Assembly of the device.

The closest technical solution is receiving to the proposed invention is the patent US 5.093.600, CL 310/332. This invention claims the piezoelectric relays containing base (housing)mounted thereon cantilever plate bimorph piezoelectric element with the contacts of the control circuit on the fixed end and with an electric contact switching circuit mounted on the free end of the piezoelectric element, interacting with the supply voltage on the contacts of the control circuit of the piezoelectric element with the other electrical contact of the switching circuit installed in the base of the relay. The disadvantages of this relay are that for reliable operation and ensure the reproducibility of the parameters of the relay is required with high accuracy (one micron) to maintain the gap between the contacts of the switching circuit, which significantly complicates the manufacturing process and obtaining the parameters of the relay.

The aim of the invention is to provide a method of manufacturing integrated micromechanical relay with a movable electrode on the basis of piezoelectric films, which, when simplified manufacturing techniques that are compatible with the technology of production of integrated circuits, would have high stability switches in continuous service resource.

This goal is achieved by a method for manufacturing integrated micromechanical relay with a movable electrode in the form of the structure is s with the piezoelectric layer, consisting of a substrate covered by a dielectric layer from the bottom (stationary electrode and a movable electrode that consists of the lower conductive layer, a dielectric layer with high elastic properties, the middle conductive layer, the piezoelectric layer, the upper conductive layer located on the surface of the aforementioned substrate, is carried out on the surface of a silicon wafer, is integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer in a single technological cycle in a simplified manufacturing techniques that are compatible with the technology of production of integrated circuits, in which the formation of the movable electrode may be in the form of the console or in the form of a beam and includes operations: forming on the surface of a silicon substrate film Si3N4by pyrolysis of SiH4; plating a layer of TiN and the formation of the structure of the "lower electrode" method of projection photolithography and chemical etching of the TiN layer; deposition of a layer FSS (phosphate-silicate glass) by the method of chemical deposition from the gas phase and the formation on the basis of the sacrificial layer by the method of liquid chemical etching; coating the first layer of TiN; the deposition of the dielectric layer Si3N4; napaloni the second layer of TiN; the deposition of the piezoelectric layer sjpc; coating a third layer of TiN; plasma etching of layer: the third layer is a TiN layer CTS, the second TiN layer, a layer of Si3N4the first TiN layer with the formation of the rolling multilayer electrode and the opening of the sacrificial layer FSS, liquid chemical etching of the sacrificial layer FSS with the formation of the air gap between the fixed and movable electrodes. This way you can create integrated micromechanical relay with a movable electrode in the form of a beam in the form of a console. Moreover, the formation of the rolling electrode in the form of a console is performed by means of additional plasma-chemical etching of the portion of the beam to obtain a movable electrode mounted on one pole. Micromechanical relay with a piezoelectric element manufactured by the above-mentioned technology has several advantages: micron dimensions, the relative simplicity of manufacture using standard operations used in the manufacture of integrated circuits, low power consumption, high performance, high reliability.

In the proposed technology, the creation of integrated micromechanical relay with a movable electrode in the form of a structure with the piezoelectric layer is in a single technological cycle of production of the integral element is, forming on a substrate a dielectric layer; a conductive layer forming the fixed electrode; and a sacrificial layer, and then applying the above mentioned layers sequentially to form a movable electrode of the lower conductive layer; a dielectric layer with high elastic properties; middle conductive layer, ferroelectric layer, the upper conductive layer; removing the final stage of the sacrificial layer side potroom to form a movable electrode fixed on one side (console), or on both sides (beam). In this technological route decreases the variance of the distances between the movable and fixed electrodes. The use of piezoelectric layers and dielectric layers with a high coefficient of elasticity ensures stable operation of the micromechanical relay avoids electrostatic "sticky" movable electrode fixed.

Literature

1. Vardan Century, Blame K., Jose K. RF MEMS and their application. M: Technosphere, 2004.

2. Technical paper "Microengineering Space Systems" for The First Canadian Workshop on MEMS Technology for Aerospace Applications". 2001 - P.49.

3. Majumder, S., N.E. McGruer, Adms G.G., P.M. Zavracky, R.H. Morrison, and J. Krim Study of contacts in an electrostatically actuated microswitch // Sen-sors and Actuators - 2001 - No. A93. - P.19-26.

4. Raspopov VIA Micromechanical devices. Tutorial - 'toole. th is. University. - Tula. 2002.

5. M.A.Michalicek. Introduction to micromechanical systems. URL: http://mems.colorado.edu.

Disclosure of inventions

Task to be solved by the present invention is directed, is to obtain a technical result, which consists in obtaining the integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer, simplifying the technical process of its production and obtaining the parameters of the piezoelectric relay. Integrated micromechanical relay is a device consisting of fixed and movable electrode, which, in turn, consists of conductive layers, layers of ferroelectric, dielectric layers with high elastic properties, which can be used to switch micro relays inverse piezoelectric effect and to avoid "sticking" rolling electrode after the relay is activated.

The problem is solved in the design of micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer comprising a substrate covered by a dielectric layer, and the lower conductive layer acting as a stationary electrode and a movable electrode that consists of: the lower conductive layer; a dielectric layer with high elastic properties; medium tocop Bogashevo layer, the piezoelectric layer, the upper conductive layer located on the surface of the aforementioned substrate and contact pads. Between the fixed electrode and the lower conductive layer movable electrode has a gap, providing an interrupt current when shutdown relay.

Thus, the hallmark of the invention is that the formation of a micromechanical relay is a single technological cycle in microelectronic technology. In the process of forming on the surface of the substrate is a dielectric layer and the fixed electrode and the above-mentioned dielectric layer, in turn, is movable electrode that consists of the lower conductive layer, a dielectric layer with high elastic properties, the middle conductive layer, the piezoelectric layer, the upper conductive layer. Between the fixed electrode and a movable electrode, there is an air gap formed after GHT etching the sacrificial layer, providing an interrupt current when disabled relay. This set of distinctive features allows you to achieve the technical result consists in obtaining the integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer made the CSOs in microelectronic technology, namely, in the creation in a single technological cycle stationary and movable electrodes by the method of sequential deposition of conductive, dielectric and piezoelectric layers on a silicon substrate using methods GHT etching, including IHT etching the sacrificial layer for the formation of the air gap between the fixed and movable electrodes.

A brief description of the drawings.

The invention is illustrated by the following drawings:

Figure 1 formation of a dielectric layer on the substrate.

Figure 2 Forming a fixed electrode on the dielectric layer.

Figure 3 Application of the sacrificial layer.

Figa the Formation of multi-layer movable electrode in the form of a beam.

Figb the Formation of multi-layer movable electrode in the form of a console.

Figa Liquid etching the sacrificial layer and forming a relay in the form of a beam.

Figb Liquid etching the sacrificial layer and forming a relay in the console view.

Designation of layers: 1 - substrate (Si); 2 - dielectric layer (Si3N4); 3 - lower electrode conductive layer (TiN); 4 - the first conductor layer movable electrode (TiN); 5 - dielectric layer with high elastic properties (Si3N4); 6 - the second conductor layer movable electrode (TiN); 7 - piezoelectric layer (sjpc); 8 - the third conductor layer concentration in the second electrode (TiN); 9 - the sacrificial layer (FSS).

An example of carrying out the invention

The technology for manufacture of integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer on the surface of silicon wafers with a diameter of 100 mm, including the following operations to obtain a micro relays in the form of a beam: forming on the surface of a silicon substrate (1) film Si3N4(2) thickness of 0.25 μm by pyrolysis of SiH4; plating a layer of TiN with a thickness of 0.15 μm and structure formation "bottom electrode" (3) when conducting projection photolithography and chemical etching of the TiN layer; deposition of a layer FSS (phosphate-silicate glass) of a thickness of 0.5 μm by chemical vapor deposition from the gas phase and the formation on the basis of the sacrificial layer (9) by the method of liquid chemical etching; coating the first layer of TiN (4) thickness 0.25 μm; the deposition of a dielectric layer with high elastic properties of Si3N4(5) with a thickness of 0.7 μm; coating a second layer of TiN (6) thickness 0.25 μm; the deposition of the piezoelectric layer CTS (7) with a thickness of 0.7 μm; coating a third layer of TiN (8) thickness 0.25 μm; plasma etching of layer: the third layer is a TiN layer CTS, the second TiN layer, a layer of Si3N4the first TiN layer with the formation of the rolling multilayer electrode and the opening of the sacrificial layer is SS, liquid chemical etching of the sacrificial layer FSS with the formation of the air gap (11) between the fixed and movable electrodes; to obtain micro relays console produced plasma etching of part of the beam to obtain a movable electrode mounted on one pole.

Obtained according to the described technology integrated micromechanical relays have a micron size of 20-80 microns, operating voltage U=10 V at a frequency 0-1000 Hz, provide high stability switches in continuous service resource.

1. A method of manufacturing integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer consisting of a substrate covered by a dielectric layer from the bottom (stationary electrode and a movable electrode that consists of the lower conductive layer, a dielectric layer with high elastic properties, the middle conductive layer, the piezoelectric layer, the upper conductive layer located on the surface of the aforementioned substrate, is carried out on the surface of a silicon wafer, characterized in that the integrated micromechanical relay with a movable electrode in the form of a structure with a piezoelectric layer in a single technological cycle in a simplified manufacturing techniques, overestimat technology production of integrated circuits, in which the formation of the movable electrode may be in the form of the console or in the form of a beam, and includes the steps: forming on the surface of a silicon substrate film Si3N4by pyrolysis SiN4; plating a layer of TiN and the formation of the structure of the "lower electrode" method of projection photolithography and chemical etching of the TiN layer; deposition of a layer FSS (phosphate-silicate glass) by the method of chemical deposition from the gas phase and the formation on the basis of the sacrificial layer by the method of liquid chemical etching; coating the first layer of TiN; the deposition of the dielectric layer Si3N4; spraying a second layer of TiN; the deposition of the piezoelectric layer sjpc; coating a third layer of TiN; plasma etching of layer: the third layer is a TiN layer CTS, the second TiN layer, a layer of Si3N4the first TiN layer with the formation of the rolling multilayer electrode and the opening of the sacrificial layer FSS, liquid chemical etching of the sacrificial layer FSS with the formation of the air gap between the fixed and movable electrodes.

2. The method according to claim 1, wherein forming the movable electrode is in the form of a beam.

3. The method according to claim 2, in which the formation of the movable electrode is in the form of a console method additional plasma-chemical etching of the portion of the beam to obtain the concentration in the second electrode, mounted on the same support.

 

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