CN109509831A - A kind of PVDF piezoelectric transducer and preparation method thereof based on indium selenide transistor - Google Patents
A kind of PVDF piezoelectric transducer and preparation method thereof based on indium selenide transistor Download PDFInfo
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- CN109509831A CN109509831A CN201811553659.4A CN201811553659A CN109509831A CN 109509831 A CN109509831 A CN 109509831A CN 201811553659 A CN201811553659 A CN 201811553659A CN 109509831 A CN109509831 A CN 109509831A
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- AKUCEXGLFUSJCD-UHFFFAOYSA-N indium(3+);selenium(2-) Chemical compound [Se-2].[Se-2].[Se-2].[In+3].[In+3] AKUCEXGLFUSJCD-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 4
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- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/30—Piezoelectric or electrostrictive devices with mechanical input and electrical output, e.g. functioning as generators or sensors
- H10N30/302—Sensors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/06—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration
- H01L27/0611—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region
- H01L27/0617—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a non-repetitive configuration integrated circuits having a two-dimensional layout of components without a common active region comprising components of the field-effect type
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/24—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only semiconductor materials not provided for in groups H01L29/16, H01L29/18, H01L29/20, H01L29/22
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/857—Macromolecular compositions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N39/00—Integrated devices, or assemblies of multiple devices, comprising at least one piezoelectric, electrostrictive or magnetostrictive element covered by groups H10N30/00 – H10N35/00
Abstract
The present invention relates to a kind of PVDF piezoelectric transducer and preparation method thereof based on indium selenide transistor, belong to piezoelectric transducer field, including P-type wafer, silica membrane, aluminum oxide film, metal electrode, InSe nano thin-film and PVDF thin film, silica membrane is arranged in the side upper surface of P-type wafer, aluminum oxide film and InSe nano thin-film, PMMA layers are provided on InSe nano thin-film, two metal electrodes are fixed on InSe nano thin-film, the other side upper surface of P-type wafer is provided with PVDF thin film, PVDF thin film upper and lower surface is equipped with layer of Au, Au is connected with metal electrode.The present invention selects the PVDF thin film with highly sensitive, high mobility two-dimentional selenizing phosphide material and with excellent piezoelectric properties to provide signal, use the intrinsic amplification of transistor, the pressure signal provided by PVDF is provided, the detection accuracy and sensitivity of pressure sensor are greatly improved.
Description
Technical field
The present invention relates to a kind of PVDF piezoelectric transducer and preparation method thereof based on indium selenide transistor belongs to piezoelectricity biography
Sensor technical field.
Background technique
In recent years, piezoelectric transducer equipment is being widely used in many technical fields, such as display, robot,
Energy collecting device etc..In biomedicine field, pass of the development of highly sensitive, integrated pressure sensor by numerous scientists
Note, in palpation and robotic surgery, directly contact physical object highly sensitive touch sensor be there is an urgent need to, and select
The structure of suitable piezoelectric material and sensor is the hot spot of current piezoelectricity area research.
Since stepping into 21 century, the research field and application prospect of nanometer material and technology be extended to rapidly information, the energy,
Material, biology, medicine etc..Nano material shows excellent properties since its is many kinds of, extensive
For assembling various nano electron devices, and increasingly affect the daily life of the mankind.
Two-dimensional layer semiconductor material shows the physics and chemical property different from block materials, in nano electron device
With present huge application prospect in nano photoelectronic devices, therefore become the hot spot that material and electronic field are studied.Wherein
Typically graphene and molybdenum disulfide, though graphene has excellent property, the band structure of zero band gap makes based on stone
The field effect transistor of black alkene has extremely low photodetection signal-to-noise ratio with extremely low current on/off ratio, photodetector, greatly
Graphene is limited in the application of high-performance microelectronics and optoelectronic areas greatly.Although molybdenum disulfide has the forbidden band controllable with the number of plies
Width, however due to the limitation of material self property, lack high electron transport performance and high photodetection performance.
For piezoelectric transducer highly sensitive at present in artificial intelligence, the field that numerous forward positions such as biological medicine intersect plays must
Indispensable effect, although having carried out going deep into very much scientific research in this respect in the world at present, however the equipment of ultraprecise at present
More stringent requirements are proposed for sensitivity and precision for pressure sensor.The current pressure sensor of routine on the market
Detection accuracy and sensitivity are all lower, and general volume is larger, is not able to satisfy increasingly developed scientific and technological level.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provide a kind of PVDF piezoelectric transducer based on indium selenide transistor and its
Production method is selected with highly sensitive, high mobility two-dimentional selenizing phosphide material and with the PVDF thin film of excellent piezoelectric properties
Signal is provided, using the intrinsic amplification of transistor, the pressure signal provided by PVDF is provided, pressure sensing is greatly improved
The detection accuracy and sensitivity of device.
Term is explained:
PVDF: Kynoar, a kind of novel high molecular material belong to a kind of tough and tensile thermoplastic engineering plastic, weight
Multiple unit is made of-CH2-CH2-, its compound with regular structure is a kind of semicrystalline polymer.
PMMA: polymethyl methacrylate is referred to as acrylic compounds with the obtained polymer of acrylicacidandesters Type of Collective
Resin, corresponding plastics are referred to as polyacrylic plastics, wherein, polymethyl most widely used with polymethyl methacrylate
Sour methyl esters abbreviation code name is PMMA, is commonly called as organic glass.
PI glue band: Quan Mingwei Kapton Tape, a most important characteristic is exactly high temperature resistant.
% of the invention is mass percent.
The invention adopts the following technical scheme:
On the one hand, the present invention provides a kind of PVDF piezoelectric transducer based on indium selenide transistor, including P-type wafer, two
Silicon oxide film, aluminum oxide film, two metal electrodes, InSe nano thin-film and PVDF thin film, the one of the P-type wafer
Side upper surface sets gradually the silica membrane, aluminum oxide film and InSe nano thin-film, the InSe nanometer thin
PMMA layers are additionally provided on film, two metal electrodes are fixed on InSe nano thin-film, the other side upper surface of the P-type wafer
It is provided with the PVDF thin film, the PVDF thin film upper and lower surface is equipped with layer of Au, is connected between the Au and metal electrode.
Preferably, the silica membrane is thermal oxide and with a thickness of 80~120nm silica membrane.
In general, silicon wafer is divided into four classes, it is lightly doped, heavy doping, p-type, N-shaped permutation and combination, the present invention uses the p-type of heavy doping
Silicon wafer, the aluminum oxide film with a thickness of 10~15nm.
Preferably, described PMMA layers with a thickness of 200~250nm, the InSe nanometer film thickness is 20~50nm.
Preferably, the Au with a thickness of 50~100nm.
Preferably, the metal electrode is Ti/Au electrode, wherein Ti with a thickness of 5~15nm, Au with a thickness of 50~
100nm。
On the other hand, the present invention also provides a kind of production method of PVDF piezoelectric transducer based on indium selenide transistor,
The following steps are included:
(1) prepare the thermal oxide P-type wafer of silica, cleaned；
(2) cleaning finishes, and deposits aluminum oxide at 100~200 DEG C using atomic layer deposition (ALD) technology, so that
Aluminum oxide film with a thickness of 10~15nm, aluminum oxide film can be with the coulomb impurity scattering of shield interface；
(3) InSe nano thin-film is prepared in the P-type wafer that growth has silica membrane and aluminum oxide film；
(4) multilayer InSe nano thin-film is positioned using optical microscopy, defines electricity with metal mask version (shadowmask)
Pole position is placed in electron beam evaporation depositing system, and evaporation metal electrode obtains device one；
(5) side that device one is covered using PI glue band, by one spin coating PMMA of device, and under conditions of 110~170 DEG C
30~90min is toasted, the unlapped side of device one is packaged；
(6) PI glue band is torn, and the side region that adhesive tape covers is placed in 20 in the hydrofluoric acid of 5~15% concentration~
30min etches away the silica and aluminum oxide of the side of PI glue band covering；
(7) device side is covered using photomask, magnetron sputtering deposits 50 on the region that hf etching falls~
The gold of 100nm；
(8) PVDF material is placed on gold, generates PVDF thin film；
(9) photomask is used, magnetron sputtering grows the gold of 50~100nm of deposition in PVDF thin film, in testing
It will be connected between the Au on PVDF thin film top and metal electrode.
Preferably, in the step (1), the process of cleaning are as follows:
A, P-type wafer is pre-purged using nitrogen gun；
B, use concentration for 3~10% 90 alkaline cleaning fluid of enlightening health Decon, after 5~10min of ultrasound, with largely go from
Sub- water (DI water) is rinsed；
C, after being rinsed with a large amount of deionized waters, it is put into 5~10min of ultrasound in the beaker equipped with deionized water；
D, it places into another beaker equipped with deionized water and is taken out after 5~10min of ultrasound, blown immediately with nitrogen gun
It is dry；
E, it is taken out after 5~10min of ultrasound in acetone, is immediately placed in the beaker equipped with ethyl alcohol, and in the burning that ethyl alcohol is housed
It takes out after 5~10min of cup ultrasound, is dried up immediately with nitrogen gun.
Preferably, in the step (1), the size of P-type wafer is long 3~5cm, wide 1~2cm；
The Ti/Au electrode that metal electrode in the step (4) is, Ti with a thickness of 5~15nm, Au with a thickness of 50~
100nm。
Preferably, in the step (3), the process of InSe nano thin-film is prepared are as follows: the InSe material for the use of purity being 99%
Material, takes a fritter InSe to be placed on Scotch adhesive tape, then sticks tear tape repeatedly, repeatedly after adhesive tape sticked have in growth
In the P-type wafer of silica membrane and aluminum oxide film, tears adhesive tape off and obtain the InSe nano thin-film of multilayer.
The invention has the benefit that
1) present invention uses PVDF material, and piezoelectric membrane softness is frivolous, piezoelectric constant is high, frequency response is wide, response is fast
Degree is fast, is adapted to significantly deform and have stronger thermal stability.
2) present invention is integrated on a circuit chip using two-dimentional field effect transistor in conjunction with piezoelectric material, selects two
The channel material in material with high mobility, highly sensitive selenizing phosphide material as transistor is tieed up, uses PVDF as pressure
Electric material is played the effect of crystal amplifier by grid modulation, voltage signal is converted to highly sensitive current signal.
3) the New Two Dimensional selenizing phosphide material that the present invention selects has lesser electron effective mass, high electron transfer
Rate, the high absorption coefficient of light and small direct band gap have the performances such as excellent electricity, light, mechanics, the field-effect based on indium selenide
The electron mobility of transistor can achieve 1000cm2/Vs。
To sum up, the present invention two-dimentional selenizing phosphide material of the selection with highly sensitive high mobility and with excellent piezoelectric properties
PVDF thin film provides signal, using the intrinsic amplification of transistor, amplifies the pressure signal provided by PVDF thin film, significantly
Pressure detecting and signal transmitting are integrated on a micro chip by the detection accuracy and sensitivity for improving pressure sensor,
The application in terms of reality can be greatly improved.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of PVDF piezoelectric transducer based on indium selenide transistor of the invention；
Fig. 2 is the X-ray diffraction image (XRD) for the InSe nano material that the present invention uses；
Fig. 3 is the atomic force microscope schematic diagram for the InSe nano thin-film that the present invention is transferred on substrate, substrate herein
Refer to that growth has the P-type wafer of silica membrane and aluminum oxide film；
Fig. 4 is the transmission electron microscope image of InSe nano material of the invention；
Fig. 5 is scanning electron microscope (SEM) image of indium selenide field effect transistor of the invention；
In Fig. 6, figure (a) is the transfer characteristic curve of indium selenide field effect transistor, and figure (b) is indium selenide field effect transistor
The corresponding mutual conductance image of pipe transfer characteristic curve, figure (c) are the output characteristic curve of indium selenide field effect transistor, and figure (d) is
Transfer characteristic curve of the indium selenide field effect transistor under different source-drain voltages；
Fig. 7 is that the present invention is based on the PVDF sensors of indium selenide transistor under grid impulse voltage and under pressure pulse
Source-drain current modified-image；
Wherein: 1-p type silicon wafer, 2- silica membrane, 3- aluminum oxide film, 4-InSe nano thin-film, 5- metal
Electrode, 6-PMMA layers, 7-Au, 8-PVDF film.
Specific embodiment:
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool
Body embodiment is described in detail, but is not limited only to this, what the present invention did not elaborated, presses this field routine techniques.
Embodiment 1:
As shown in Figure 1, a kind of PVDF piezoelectric transducer based on indium selenide transistor, including P-type wafer 1, silica
Film 2,3, two metal electrodes 5 of aluminum oxide film, InSe nano thin-film 4 and PVDF thin film 8, on the side of P-type wafer 1
Surface sets gradually silica membrane 2, aluminum oxide film 3 and InSe nano thin-film 4, also sets on InSe nano thin-film 4
It is equipped with PMMA layer 6, two metal electrodes 5 are fixed on InSe nano thin-film 4, and the other side upper surface of P-type wafer 1 is provided with
PVDF thin film 8,8 upper and lower surface of PVDF thin film are equipped with layer of Au 7, are connected between Au7 and metal electrode 5.
Embodiment 2:
A kind of PVDF piezoelectric transducer based on indium selenide transistor, structure is as described in Example 1, the difference is that two
Silicon oxide film is thermal oxide and with a thickness of 100nm silica membrane；Aluminum oxide film with a thickness of 10nm；
PMMA layers with a thickness of 250nm, InSe nanometer film 4 with a thickness of 30nm, Au with a thickness of 50nm.
Embodiment 3:
A kind of PVDF piezoelectric transducer based on indium selenide transistor, structure is as described in Example 2, the difference is that golden
Category electrode is Ti/Au electrode, wherein Ti with a thickness of 10nm, Au with a thickness of 60nm.
Embodiment 4:
A kind of production method of the PVDF piezoelectric transducer based on indium selenide transistor, comprising the following steps:
(1) prepare the thermal oxide P-type wafer of silica, cleaned；
(2) cleaning finishes, and deposits aluminum oxide at 100~200 DEG C using atomic layer deposition (ALD) technology, so that
Aluminum oxide film with a thickness of 10~15nm, aluminum oxide film can be with the coulomb impurity scattering of shield interface；
(3) InSe nano thin-film is prepared in the P-type wafer that growth has silica membrane and aluminum oxide film；
(4) multilayer InSe nano thin-film is positioned using optical microscopy, defines electricity with metal mask version (shadowmask)
Pole position is placed in electron beam evaporation depositing system, and evaporation metal electrode obtains device one；
(5) side that device one is covered using PI glue band, by one spin coating PMMA of device, and under conditions of 110~170 DEG C
30~90min is toasted, the unlapped side of device one is packaged；
(6) PI glue band is torn, and the side region that adhesive tape covers is placed in 20 in the hydrofluoric acid of 5~15% concentration~
30min etches away the silica and aluminum oxide of the side of PI glue band covering；
(7) device side is covered using photomask, magnetron sputtering deposits 50 on the region that hf etching falls~
The gold of 100nm；
(8) PVDF material is placed on gold, generates PVDF thin film；
(9) photomask is used, magnetron sputtering grows the gold of 50~100nm of deposition in PVDF thin film, in testing
It will be connected between the Au on PVDF thin film top and metal electrode.
Embodiment 5:
A kind of production method of the PVDF piezoelectric transducer based on indium selenide transistor, method is as described in Example 4, and institute is not
With, in step (1), the process of cleaning are as follows:
A, P-type wafer is pre-purged using nitrogen gun；
B, using 3~10% 90 alkaline cleaning fluid of enlightening health Decon, after 5~10min of ultrasound, with a large amount of deionized waters
(DI water) is rinsed；
C, after being rinsed with a large amount of deionized waters, it is put into 5~10min of ultrasound in the beaker equipped with deionized water；
D, it places into another beaker equipped with deionized water and is taken out after 5~10min of ultrasound, blown immediately with nitrogen gun
It is dry；
E, it is taken out after 5~10min of ultrasound in acetone, is immediately placed in the beaker equipped with ethyl alcohol, and in the burning that ethyl alcohol is housed
It takes out after 5~10min of cup ultrasound, is dried up immediately with nitrogen gun.
Embodiment 6:
A kind of production method of the PVDF piezoelectric transducer based on indium selenide transistor, method is as described in Example 4, and institute is not
With in step (1), the size of P-type wafer is long 3~5cm, wide 1~2cm；The Ti/ that metal electrode in step (4) is
Au electrode, Ti with a thickness of 5~15nm, Au with a thickness of 50~100nm.
Embodiment 7:
A kind of production method of the PVDF piezoelectric transducer based on indium selenide transistor, method is as described in Example 4, and institute is not
It is same, in step (3), prepare the process of InSe nano thin-film are as follows: the InSe material for the use of purity being 99% takes a fritter
InSe is placed on Scotch adhesive tape, then sticks tear tape repeatedly, repeatedly after adhesive tape sticked have silica thin in growth
In the P-type wafer of film and aluminum oxide film, tears adhesive tape off and obtain the InSe nano thin-film of multilayer.
In the present invention, using New Two Dimensional selenizing phosphide material, there is lesser electron effective mass, high electron transfer
Rate, the high absorption coefficient of light and small direct band gap have the performances such as excellent electricity, light, mechanics, the field-effect based on indium selenide
The electron mobility of transistor can achieve 1000cm2/ Vs, as shown in Fig. 2, be the X-ray diffraction image of InSe nano material,
Its abscissa is the angle of incident ray and reflection light, and ordinate is the intensity of incident ray and reflection light, the position of peak value
The lattice radial direction for indicating different is set, peak sharply illustrates that crystal property is fine very much, and the selenizing phosphide material for illustrating growth has preferably
Lattice structure.
Fig. 3 is atomic force microscope (AFM, the CSPM5500) pattern for the InSe nano thin-film that the present invention is transferred on substrate
Figure and altitude profile figure, substrate herein refer to that growth has the P-type wafer of silica membrane and aluminum oxide film, wherein
Its abscissa is step-length, and ordinate is height, and what the present invention used makes with a thickness of the InSe nanometer film of 20~50nm
High performance electronic device.
Fig. 4 is the transmission electron microscope image of InSe nano material, it can be seen from the figure that InSe nanometer film has
There is preferable lattice structure.
Fig. 5 is scanning electron microscope (SEM) image of indium selenide field effect transistor, illustrates field effect transistor
Planar structure.
The embodiment of the present invention 3 is surveyed under the conditions of room temperature (20~25 DEG C) using AgilentB2901A parameter analyzer
Amount uses the transfer characteristic and output characteristic curve of the multilayer indium selenide field effect transistor of PMMA encapsulation.
For transfer characteristic, as shown in Fig. 6 (a), abscissa is grid voltage VGSSize, ordinate is source-drain current
IDSSize, VGSIn VDSTo be scanned when 1V from -10V to 10V, it is seen that device has very high switching current
Than subthreshold swing very little, performance is fine, is calculated from Fig. 6 (a), and the switching current ratio of transistor is 106, subthreshold value pendulum
Width S is 750mV/decade, off-state current 10pA.
For output characteristics, as shown in Fig. 6 (b), abscissa is source-drain voltage VDSVariation, ordinate is source-drain current
IDSSize, VDSIt is scanned from 0 to 10V, while VGSThe stepping from -10V to 10V, increment 4V, different curves is different
Curve under grid voltage, curve table funerary objects part have preferable saturation region, can reach faster saturation region and be saturated electricity
Stream is high；From the fitting of the least square method of Fig. 6 (b), the linear electron mobility that we are extracted transistor is about 297cm2/
Vs, threshold voltage VTFor -5.8V.
It shown in output characteristics image such as Fig. 6 (c), is extracted from Fig. 1 with grid voltage VGSThe mutual conductance of variation
With mobility image, the variation of mobility is shown, mobility of the invention is very high, and device has very high mobility and response speed
Degree, performance are preferable.
Fig. 6 (d) illustrates indium selenide field effect transistor in different source-drain voltage (VDS) under transfer characteristic curve, from
Linear zone is to saturation region, and for n-type semiconductor, transistor generally has positive threshold voltage, InSe nanometer of the invention
Film illustrates the threshold voltage of negative sense, and this demonstrate indium selenide-dielectric layer interfaces a certain amount of positive charge, the present invention
Aluminum oxide and silica are grown together as dielectric layer using ALD, this is because three oxygen with high dielectric constant k
Change two aluminium can coulomb impurity scattering at effective shield interface, and effectively improve the field-effect mobility of device, this hair
Bright piezoelectric transducer can be in linear zone saturation region operation.
Fig. 7 is source and drain of the PVDF sensor based on indium selenide transistor under grid impulse voltage and under pressure pulse
Curent change (Ids) image, abscissa is the time, and ordinate is source-drain current (Ids), upper figure is corresponding to apply different grids
The source-drain current of pulse voltage changes, and the following figure is the source-drain current variation for applying pressure pulse.From image as can be seen that with
The increase of grid impulse voltage, the variation tendency of electric current increase, and are positively related variations, by grid impulse voltage variation with it is corresponding
Curent change fitting, then can be obtained by the variation of electric current grid offer pulse voltage size, i.e., pressure production
The size of raw voltage, it is available by simulating the size of the available power applied on PVDF of piezoelectric polarization characteristic
The voltage that the pulse that PVDF applies is generated in 400mV or so,
In Fig. 7, the pressure of application is 0.098N (10g counterweight).
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of PVDF piezoelectric transducer based on indium selenide transistor, which is characterized in that thin including P-type wafer, silica
Film, aluminum oxide film, two metal electrodes, InSe nano thin-film and PVDF thin film, the side upper surface of the P-type wafer
The silica membrane, aluminum oxide film and InSe nano thin-film are set gradually, is also set on the InSe nano thin-film
PMMA layers are equipped with, two metal electrodes are fixed on InSe nano thin-film, and the other side upper surface setting of the P-type wafer is
PVDF thin film is stated, the PVDF thin film upper and lower surface is equipped with layer of Au, is connected between the Au and metal electrode.
2. the PVDF piezoelectric transducer according to claim 1 based on indium selenide transistor, which is characterized in that the dioxy
SiClx film is thermal oxide and with a thickness of 80~120nm silica membrane.
3. the PVDF piezoelectric transducer according to claim 2 based on indium selenide transistor, which is characterized in that the p-type
Silicon wafer be heavy doping P-type wafer, the aluminum oxide film with a thickness of 10~15nm.
4. the PVDF piezoelectric transducer according to claim 3 based on indium selenide transistor, which is characterized in that the PMMA
Layer with a thickness of 200~250nm, the InSe nanometer film thickness is 20~50nm.
5. the PVDF piezoelectric transducer according to claim 4 based on indium selenide transistor, which is characterized in that the Au's
With a thickness of 50~100nm.
6. the PVDF piezoelectric transducer according to claim 5 based on indium selenide transistor, which is characterized in that the metal
Electrode is Ti/Au electrode, wherein Ti with a thickness of 5~15nm, Au with a thickness of 50~100nm.
7. a kind of production method of the PVDF piezoelectric transducer described in claim 1 based on indium selenide transistor, feature exist
In, comprising the following steps:
(1) prepare the thermal oxide P-type wafer of silica, cleaned；
(2) cleaning finishes, and aluminum oxide is deposited at 100~200 DEG C using technique for atomic layer deposition, so that aluminum oxide
Film with a thickness of 10~15nm；
(3) InSe nano thin-film is prepared in the P-type wafer that growth has silica membrane and aluminum oxide film；
(4) multilayer InSe nano thin-film is positioned using optical microscopy, defines electrode position with metal mask version, is placed on electronics
In beam evaporation depositing system, evaporation metal electrode obtains device one；
(5) side that device one is covered using PI glue band, is toasted by one spin coating PMMA of device, and under conditions of 110~170 DEG C
The unlapped side of device one is packaged by 30~90min；
(6) PI glue band is torn, and the side region that adhesive tape covers is placed in 20~30min in the hydrofluoric acid of 5~15% concentration,
Etch away the silica and aluminum oxide of the side of PI glue band covering；
(7) device side is covered using photomask, magnetron sputtering deposits 50~100nm on the region that hf etching falls
Gold；
(8) PVDF material is placed on gold, generates PVDF thin film；
(9) photomask is used, magnetron sputtering grows the gold of 50~100nm of deposition in PVDF thin film, in testing will
It is connected between the Au on PVDF thin film top and metal electrode.
8. the production method of the PVDF piezoelectric transducer according to claim 7 based on indium selenide transistor, feature exist
In, in the step (1), the process of cleaning are as follows:
A, P-type wafer is pre-purged using nitrogen gun；
B, it uses concentration for 3~10% alkaline cleaning fluid, after 5~10min of ultrasound, is rinsed with a large amount of deionized waters；
C, after being rinsed with deionized water, it is put into 5~10min of ultrasound in the beaker equipped with deionized water；
D, it places into another beaker equipped with deionized water and is taken out after 5~10min of ultrasound, dried up immediately with nitrogen gun；
E, it is taken out after 5~10min of ultrasound in acetone, is immediately placed in the beaker equipped with ethyl alcohol, and super in the beaker equipped with ethyl alcohol
It takes out after 5~10min of sound, is dried up immediately with nitrogen gun.
9. the production method of the PVDF piezoelectric transducer according to claim 6 based on indium selenide transistor, feature exist
In in the step (1), the size of P-type wafer is long 3~5cm, wide 1~2cm；
The Ti/Au electrode that metal electrode in the step (4) is, Ti with a thickness of 5~15nm, Au with a thickness of 50~
100nm。
10. the production method of the PVDF piezoelectric transducer according to claim 6 based on indium selenide transistor, feature exist
In preparing the process of InSe nano thin-film in the step (3) are as follows: the InSe material for the use of purity being 99% takes a fritter
InSe is placed on adhesive tape, then sticks tear tape repeatedly, repeatedly after adhesive tape sticked have silica membrane and three in growth
In the P-type wafer of Al 2 O film, tears adhesive tape off and obtain the InSe nano thin-film of multilayer.
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| CN113066905A (en) * | 2021-04-12 | 2021-07-02 | 山东大学 | Method for preparing indium selenide photoelectric detector by photoetching technology |
| CN114105636A (en) * | 2021-12-30 | 2022-03-01 | 景德镇市鑫惠康电子有限责任公司 | Method for preparing 4M energy-gathering transducer by utilizing indium selenide modified niobium-zinc lead zirconate titanate system |
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