WO2022048382A1 - 一种mems结构 - Google Patents
一种mems结构 Download PDFInfo
- Publication number
- WO2022048382A1 WO2022048382A1 PCT/CN2021/110434 CN2021110434W WO2022048382A1 WO 2022048382 A1 WO2022048382 A1 WO 2022048382A1 CN 2021110434 W CN2021110434 W CN 2021110434W WO 2022048382 A1 WO2022048382 A1 WO 2022048382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode layer
- mems structure
- substrate
- layer
- piezoelectric
- Prior art date
Links
- 239000000758 substrate Substances 0.000 claims abstract description 22
- 230000002093 peripheral effect Effects 0.000 claims abstract description 12
- 230000007935 neutral effect Effects 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 7
- 230000035945 sensitivity Effects 0.000 abstract description 16
- 230000005591 charge neutralization Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 239000010408 film Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 2
- 238000001755 magnetron sputter deposition Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
Definitions
- the present application relates to the technical field of micro-electromechanical systems, and in particular, to a MEMS structure and a method for forming the same.
- MEMS Micro-Electro-Mechanical Systems, that is, Micro-Electro-Mechanical Systems
- microphones mainly include two types: capacitive and piezoelectric.
- MEMS piezoelectric microphones are prepared by using micro-electromechanical system technology and piezoelectric thin-film technology. Due to the use of semiconductor planar technology and bulk silicon processing technologies, they are small in size, small in volume, and good in consistency. At the same time, compared with the condenser microphone, it has the advantages of no bias voltage, large operating temperature range, dustproof, waterproof, etc., but its sensitivity is relatively low, which restricts the development of MEMS piezoelectric microphones.
- the present application proposes a MEMS structure, which can effectively improve the sensitivity.
- a MEMS structure comprising:
- the second part of the piezoelectric layer is formed above the second electrode layer
- first electrode layer and the first part are symmetrical with the second part and the third electrode layer with the second electrode layer as a neutral plane.
- the thickness of the middle region of the diaphragm is greater than the thickness of the peripheral region of the diaphragm, which is beneficial to release the stress at the connection between the piezoelectric layer and the substrate, and reduces the charge in the peripheral region and the middle region. and the resulting reduction in sensitivity.
- the MEMS structure provided by the present application increases the sensitivity.
- FIG. 1 shows a schematic perspective view of a MEMS structure provided according to some embodiments
- FIG. 2 illustrates a cross-sectional perspective view of a MEMS structure provided in accordance with some embodiments
- FIG. 3 illustrates a top view of a MEMS structure provided in accordance with some embodiments
- FIG. 4 shows a schematic diagram of connection of electrode layers of a MEMS structure provided according to some embodiments
- FIG. 5 shows the sensitivity frequency response curve of the MEMS structure in FIG. 1 .
- a MEMS structure that can be used in sensors or actuators, such as microphones, speakers, hydrophones.
- the MEMS structure may include a piezoelectric MEMS microphone that converts acoustic energy into electrical energy.
- the MEMS structure includes a laminated substrate 10, a first electrode layer 20, a first portion 31 of a piezoelectric layer 30, a second electrode layer 40, a second portion 32 of the piezoelectric layer 30, and a third electrode layer 50 .
- the substrate 10 has a cavity 11 .
- the first electrode layer 20 is suspended in the cavity 11 .
- the first portion 31 of the piezoelectric layer 30 is formed over the first electrode layer 20 and is connected to the substrate 10 .
- the second electrode layer 40 is formed over the first portion 31 .
- the second portion 32 of the piezoelectric layer 30 is formed over the second electrode layer 40 .
- the third electrode layer 50 is formed over the second portion 32 .
- the first electrode layer 20 and the first part 31 are symmetrical with the second part 32 and the third electrode layer 50 with the second electrode layer 40 as the neutral plane. In other words, the first electrode layer 20 and the first portion 31 are symmetrical in the thickness direction with respect to the second electrode layer 40 and the second portion 32 and the third electrode layer 50 .
- the output voltage of the MEMS structure is improved by such a bimorph structure.
- the MEMS structure further includes an isolation layer (not shown in the figure), and the isolation layer is formed at the position of the upper surface and the lower surface of the second electrode layer 40 .
- isolation layers are formed at the locations of the upper surface of the first electrode layer 20 and the lower surface of the third electrode layer 50 . Providing the isolation layer can avoid short circuits between the first electrode layer 20 , the second electrode layer 40 and the third electrode layer 50 .
- the top surface of the first electrode layer 20 is located below the top surface of the substrate 10
- the bottom surface of the second electrode layer 40 is located above the top surface of the substrate 10
- the vertical projection area of the first electrode layer 20 is located in the cavity 11 .
- the second portion 32 is formed over the second electrode layer 40 and the first portion 31 .
- the top surface of the peripheral region of the second portion 32 is lower than the top surface of the middle region of the second portion 32
- the peripheral region of the second portion 32 is connected to the substrate 10
- the third electrode layer 50 is formed in the middle region of the second portion 32 above.
- the thickness of the middle region of the diaphragm is greater than the thickness of the peripheral region of the diaphragm, which is beneficial to release the stress at the connection between the piezoelectric layer 30 and the substrate 10 and reduce the charge neutralization in the peripheral region and the middle region. decreased sensitivity.
- the MEMS structure provided by the present application increases the sensitivity.
- the first electrode layer 20 , the second electrode layer 40 and the third electrode layer 50 have corresponding at least two equal divisions. In some embodiments, the first electrode layer 20 , the second electrode layer 40 and the third electrode layer 50 have corresponding 12 equal divisions.
- the second electrode layer 40 is drawn out through a first wire (not shown in the figure) as a terminal of the MEMS structure .
- the first electrode layer 20 and the third electrode layer 50 are connected, they are connected to the second electrode layer 40 in the second equal division.
- the first equal division is adjacent to the second equal division, and multiple adjacent equal divisions are repeatedly connected.
- the first electrode layer 20 and the third electrode layer 50 in the twelfth equal division are connected as another terminal of the MEMS structure. Through this electrode connection method, the output charge can be increased without changing the output voltage, thereby increasing the output energy of the MEMS structure.
- the material of the substrate 10 includes the material of silicon or any suitable silicon-based compound or derivative (eg, silicon wafer, SOI, polysilicon on SiO2 /Si).
- the substrate 10 may have various shapes, not limited to pentagons, hexagons, or other regular or irregular shapes.
- the first electrode layer 20 may be formed by electron beam evaporation, magnetron sputtering process.
- the first electrode layer 20 includes aluminum, gold, platinum, molybdenum, titanium, chromium and their composite films or other suitable materials.
- the materials of the second electrode layer 40 and the third electrode layer 50 may be the same as or different from those of the first electrode layer 20 .
- the piezoelectric layer 30 includes one or more layers of zinc oxide, aluminum nitride, organic piezoelectric films, lead zirconate titanate (PZT), perovskite piezoelectric films, or other suitable materials.
- the piezoelectric layer 30 may be formed by a CVD process or a magnetron sputtering process or other suitable processes.
- the cavity 11 may be formed by reactive ion etching or the like.
- FIG. 5 represents the sensitivity frequency response curve for the specific dimensions and parameters of the structure shown in FIG. 1 .
- the radius of the cavity 11 of the substrate 10 is 500 ⁇ m, and the radius of the center portion of the piezoelectric layer 30 and the electrode layer is 450 ⁇ m.
- the thickness of the electrode layer is 100 nm, and the material is aluminum (Al).
- the center thickness of the composite film is 1900 nm, and the edge thickness is 800 nm.
- the piezoelectric material is aluminum nitride (AlN). It can be seen from the sensitivity frequency response curve that the sensitivity of the structure is above -42dB in the frequency range of 100-20000Hz, and it is very flat within 10kHz. This just gives a size parameter and material parameter, which can be adjusted at will according to different needs.
- the thickness of the middle region of the diaphragm is greater than the thickness of the peripheral region of the diaphragm, thereby facilitating the connection between the release piezoelectric layer 30 and the substrate 10
- the stress at the outer and middle regions reduces the chance of sensitivity reduction due to charge neutralization at the peripheral and intermediate regions.
- the MEMS structure provided by the present application increases the sensitivity.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Micromachines (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
Description
Claims (10)
- 一种MEMS结构,其特征在于,包括:衬底,具有空腔;第一电极层,悬置于所述空腔内;压电层的第一部分,形成于所述第一电极层上方,并且与所述衬底连接;第二电极层,形成于所述第一部分上方;所述压电层的第二部分,形成于所述第二电极层上方;第三电极层,形成于所述第二部分上方;其中,所述第一电极层和所述第一部分以所述第二电极层为中性面与所述第二部分和所述第三电极层对称。
- 根据权利要求1所述的MEMS结构,其特征在于,所述第一电极层的顶面位于所述衬底的顶面下方,所述第二电极层的底面位于所述衬底的顶面的上方。
- 根据权利要求1所述的MEMS结构,其特征在于,所述第一电极层的竖直方向投影区域位于所述空腔内。
- 根据权利要求1所述的MEMS结构,其特征在于,所述第二部分形成于所述第二电极层和所述第一部分上方。
- 根据权利要求1所述的MEMS结构,其特征在于,所述第二部分的***区域的顶面低于所述第二部分的中间区域的顶面,所述第二部分的***区域与所述衬底连接,所述第三电极层形成于所述第二部分的中间区域的上方。
- 根据权利要求1所述的MEMS结构,其特征在于,所述第一电极层、所述第二电极层和所述第三电极层具有相对应的至少两个等分区。
- 根据权利要求6所述的MEMS结构,其特征在于,所述第一电极层、所述第二电极层和所述第三电极层具有相对应的12个等分区。
- 根据权利要求7所述的MEMS结构,其特征在于,在第一等分区内,所述第二电极层通过第一导线引出作为所述MEMS结构的一个端子;在所述第一等分区内的所述第一电极层和所述第三电极层连接后与第二等分区内的所述第二电极层相连,所述第一等分区与所述第二等分区相邻,依此重复连接多个相邻等分区;在第十二等分区内的所述第一电极层和所述第三电极层连接后作为所述MEMS结构的另一个端子。
- 根据权利要求1所述的MEMS结构,其特征在于,所述MEMS结构还包括隔离层,所述隔离层形成于所述第二电极层的上下表面的位置处,或者所述隔离层形成于所述第一电极层的上表面和所述第三电极层的下表面的位置处。
- 根据权利要求1所述的MEMS结构,其特征在于,所述MEMS结构包括压电式MEMS麦克风。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202010922526.0A CN111901736A (zh) | 2020-09-04 | 2020-09-04 | 一种mems结构 |
CN202010922526.0 | 2020-09-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022048382A1 true WO2022048382A1 (zh) | 2022-03-10 |
Family
ID=73225030
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2021/110434 WO2022048382A1 (zh) | 2020-09-04 | 2021-08-04 | 一种mems结构 |
Country Status (2)
Country | Link |
---|---|
CN (1) | CN111901736A (zh) |
WO (1) | WO2022048382A1 (zh) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111901736A (zh) * | 2020-09-04 | 2020-11-06 | 安徽奥飞声学科技有限公司 | 一种mems结构 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150350792A1 (en) * | 2008-06-30 | 2015-12-03 | Karl Grosh | Piezoelectric mems microphone |
CN109319726A (zh) * | 2017-07-31 | 2019-02-12 | 新加坡商格罗方德半导体私人有限公司 | 具有偏向控制的压电麦克风及其制造方法 |
CN111146328A (zh) * | 2019-12-31 | 2020-05-12 | 诺思(天津)微***有限责任公司 | 单晶压电结构及具有其的电子设备 |
CN111146327A (zh) * | 2019-12-25 | 2020-05-12 | 诺思(天津)微***有限责任公司 | 单晶压电结构及其制造方法、单晶压电层叠结构的电子设备 |
CN111901736A (zh) * | 2020-09-04 | 2020-11-06 | 安徽奥飞声学科技有限公司 | 一种mems结构 |
CN212324361U (zh) * | 2020-09-04 | 2021-01-08 | 安徽奥飞声学科技有限公司 | 一种mems结构 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010247295A (ja) * | 2009-04-17 | 2010-11-04 | Toshiba Corp | 圧電mems素子及びその製造方法 |
JP6787553B2 (ja) * | 2017-02-14 | 2020-11-18 | 新日本無線株式会社 | 圧電素子 |
CN110739931A (zh) * | 2019-09-04 | 2020-01-31 | 深圳市汇芯通信技术有限公司 | 一种滤波器及其制备方法 |
CN110636421A (zh) * | 2019-09-09 | 2019-12-31 | 安徽奥飞声学科技有限公司 | 一种mems结构及其制造方法 |
CN111017861A (zh) * | 2019-10-14 | 2020-04-17 | 清华大学 | 基于逆压电效应的电容-悬臂梁微型式电场测量传感器件 |
CN110677795A (zh) * | 2019-11-12 | 2020-01-10 | 安徽奥飞声学科技有限公司 | 一种mems结构 |
-
2020
- 2020-09-04 CN CN202010922526.0A patent/CN111901736A/zh active Pending
-
2021
- 2021-08-04 WO PCT/CN2021/110434 patent/WO2022048382A1/zh active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150350792A1 (en) * | 2008-06-30 | 2015-12-03 | Karl Grosh | Piezoelectric mems microphone |
CN109319726A (zh) * | 2017-07-31 | 2019-02-12 | 新加坡商格罗方德半导体私人有限公司 | 具有偏向控制的压电麦克风及其制造方法 |
CN111146327A (zh) * | 2019-12-25 | 2020-05-12 | 诺思(天津)微***有限责任公司 | 单晶压电结构及其制造方法、单晶压电层叠结构的电子设备 |
CN111146328A (zh) * | 2019-12-31 | 2020-05-12 | 诺思(天津)微***有限责任公司 | 单晶压电结构及具有其的电子设备 |
CN111901736A (zh) * | 2020-09-04 | 2020-11-06 | 安徽奥飞声学科技有限公司 | 一种mems结构 |
CN212324361U (zh) * | 2020-09-04 | 2021-01-08 | 安徽奥飞声学科技有限公司 | 一种mems结构 |
Also Published As
Publication number | Publication date |
---|---|
CN111901736A (zh) | 2020-11-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US11665968B2 (en) | Piezoelectric MEMS microphone | |
US8357981B2 (en) | Transducer devices having different frequencies based on layer thicknesses and method of fabricating the same | |
CN110099344B (zh) | 一种mems结构 | |
US20100002543A1 (en) | Micromechanical Structure for Receiving and/or Generating Acoustic Signals, Method for Producing a Micromechnical Structure, and Use of a Micromechanical Structure | |
CN110149582B (zh) | 一种mems结构的制备方法 | |
CN110099345B (zh) | 一种mems结构 | |
US20180002160A1 (en) | Mems device and process | |
CN111800716A (zh) | 一种mems结构及其形成方法 | |
CN110113700A (zh) | 一种mems结构 | |
CN110113702B (zh) | 一种mems结构的制造方法 | |
CN110636421A (zh) | 一种mems结构及其制造方法 | |
WO2022048382A1 (zh) | 一种mems结构 | |
US11631800B2 (en) | Piezoelectric MEMS devices and methods of forming thereof | |
CN209748812U (zh) | 一种mems结构 | |
CN212086492U (zh) | 一种mems结构 | |
CN110113703B (zh) | 一种mems结构的制备方法 | |
CN212324361U (zh) | 一种mems结构 | |
CN209748811U (zh) | 一种mems结构 | |
CN209627695U (zh) | 一种mems结构 | |
CN110677795A (zh) | 一种mems结构 | |
JP4944494B2 (ja) | 静電容量型センサ | |
WO2022110420A1 (zh) | 压电mems麦克风及其阵列和制备方法 | |
CN113301484A (zh) | 一种mems结构及其制造方法 | |
CN209608857U (zh) | 一种mems结构 | |
CN210609703U (zh) | 一种mems结构 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21863450 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21863450 Country of ref document: EP Kind code of ref document: A1 |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21863450 Country of ref document: EP Kind code of ref document: A1 |
|
32PN | Ep: public notification in the ep bulletin as address of the adressee cannot be established |
Free format text: NOTING OF LOSS OF RIGHTS PURSUANT TO RULE 112(1) EPC (EPO FORM 1205A DATED 22.09.2023) |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21863450 Country of ref document: EP Kind code of ref document: A1 |