CN105336854B - One kind is based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device - Google Patents
One kind is based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device Download PDFInfo
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- CN105336854B CN105336854B CN201510629843.2A CN201510629843A CN105336854B CN 105336854 B CN105336854 B CN 105336854B CN 201510629843 A CN201510629843 A CN 201510629843A CN 105336854 B CN105336854 B CN 105336854B
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- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/50—Bistable switching devices
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Abstract
The present invention relates to one kind based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, include the following steps：Step 1, by basal layer (1) washes clean；Step 2, wet method makes silver electrode layer (2) on basal layer (1)；Step 3, wet method makes functional layer (3) on silver electrode layer (2)；Step 4, wet method makes upper silver electrode layer (4) in functional layer (3)；It makes silver electrode layer (2) to complete under air environment with upper silver electrode layer (4), makes functional layer (3) and complete in air or in glove box.It is of the present invention to be based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, novel silver symmetry electrode dual stabilization part structure is prepared using Whote-wet method, it is simple for process, of low cost, Electrical bistable is good, flow complexity is relatively low, is with a wide range of applications, and may replace the flow process made in the past, it realizes process simplification, improves efficiency.
Description
Technical field
It is specifically a kind of to be based on Whote-wet method silver symmetry electrode electrostrictive polymer the present invention relates to organic optoelectronic technical field
Bistable device.
Background technology
Electric bi-stable is the fundamental characteristics of semiconductor memory component, and principal phenomena is device in a scan cycle,
It is present with two kinds of different conduction states under identical applied voltage.Specifically, apply when on device function layer film both sides
During voltage, with the variation of voltage, the conductive characteristic of device also changes therewith.When applied voltage is removed, change
Conduction state can keep for a long time.And applying backward voltage can reduce again the conduction state of device, correspond to respectively
The write-in of memory element, reading and erase process.
In recent years, as information technology develops to low-carbon, low cost, portable, high power capacity and quick response direction, with
Inorganic semiconductor has progressivelyed reach Development limitation for the memory technology of medium, and is prepared based on organic material as functional layer
Memory device obtain the concern of academia, and achieve rapid development.But preparing the mistake of polymer memory device
Cheng Zhong, using preparing electrode in nitrogen environment, flow is complicated, high condition, high cost, difficult operation influence the system of dual stabilization part
It is standby.
The content of the invention
For defect in the prior art, it is an object of the invention to provide one kind to be based on Whote-wet method silver symmetry electrode
Electrostrictive polymer bistable device, it is cumbersome for the flow of the technology of preparing of existing electrostrictive polymer bistable device, complex process come into
Row improves.
To achieve the above objectives, the present invention adopts the technical scheme that：
One kind is based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, which is characterized in that includes the following steps：
Step 1, by 1 washes clean of basal layer；
Step 2, wet method makes silver electrode layer 2 on basal layer 1；
Step 3, wet method makes functional layer 3 on silver electrode layer 2；
Step 4, wet method makes silver electrode layer 4 in functional layer 3；
It makes silver electrode layer 2 to complete under air environment with upper silver electrode layer 4, making functional layer 3 is in air or gloves
It is completed in case.
Based on the above technical solutions, substrate 1 is cleaned repeatedly using cleaning agent in step 1, then it is put successively
Enter and impregnated in deionized water, acetone and ethyl alcohol, and each ultrasonic 30 minutes, it is dried through nitrogen stream.
Based on the above technical solutions, wet method described in step 2 makes silver electrode layer 2, uses technique as spin-coating method, turns
Speed is 3000 rpms, and the spin-coating film time is 40 seconds, and gained sample in hot platform is made annealing treatment, waves solvent
Hair, annealing temperature 180 degree, annealing time 30min form silver electrode layer 2, and the thickness range of the silver electrode layer 2 of gained is 70nm
To 100nm.
Based on the above technical solutions, wet method described in step 3 makes functional layer 3, and technique is used to wait to revolve for spin-coating method
After painting, 3 one end of functional layer is wiped using the cotton swab for being moistened with good solvent, the contact mouth of silver electrode layer 2 is formed, then carries out
Annealing, makes solvent volatilize.Annealing way is hot platform.
Based on the above technical solutions, wet method described in step 4 makes upper silver electrode layer 4, uses technique as spraying process,
Gained sample in hot platform is made annealing treatment, solvent is made to volatilize, annealing temperature 180 degree, annealing time 30min, in formation
Silver electrode layer 4, the thickness range of the upper silver electrode layer 4 of gained is 100nm to 150nm.
Based on the above technical solutions, 1 material of basal layer be transparent material or opaque material,
Transparent material includes but not limited to quartz, glass, organic glass, flexible base board；
Opaque material includes but not limited to ceramics, silicon chip.
Based on the above technical solutions, 2 material of silver electrode layer is silver paste, silver content 18w% in silver paste,
The existence form of silver is no particle, wherein resin containing organic molecule, solvent is ethyl alcohol, by mass percentage, silver paste：Ethyl alcohol
For 4:1.
Based on the above technical solutions, 3 material of functional layer is the material with polymerization electrical bistable property.
Based on the above technical solutions, the material that the functional layer 3 polymerize electrical bistable property has various structures class
Type, the structure type of material include but not limited to single polymer layer, mixed polymer, multiple layer polymer, doped polymer.
Based on the above technical solutions, upper 4 material of silver electrode layer is silver paste, silver content in silver paste
18w%, silver-colored existence form is no particle, wherein resin containing organic molecule, solvent is ethyl alcohol, by mass percentage, silver
Slurry：Ethyl alcohol is 1:1.
Prepare as stated above based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, sequentially consist of base
Bottom 1, silver electrode layer 2, functional layer 3, upper silver electrode layer 4, basal layer 1, silver electrode layer 2, functional layer 3, upper silver electrode layer 4 are successively
It is connected,
Silver electrode layer 2, functional layer 3, upper silver electrode layer 4 are prepared using Whote-wet method,
For upper silver electrode layer 4 using silver-colored symmetry electrode, silver-colored symmetry electrode is cold electrode.
It is of the present invention to be based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, simple for process, of low cost, electricity
Bistable characteristic is good, and flow complexity is relatively low, is with a wide range of applications, and may replace the flow process made in the past,
It realizes process simplification, improves efficiency.
Description of the drawings
The present invention has drawings described below：
The structure chart of Fig. 1 present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing.
As shown in Figure 1, it is of the present invention based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, including walking as follows
Suddenly：
Step 1, by 1 washes clean of basal layer；
Step 2, wet method makes silver electrode layer 2 on basal layer 1；
Step 3, wet method makes functional layer 3 on silver electrode layer 2；
Step 4, wet method makes silver electrode layer 4 in functional layer 3；
It makes silver electrode layer 2 to complete under air environment with upper silver electrode layer 4, making functional layer 3 is in air or gloves
It is completed in case.
The dual stabilization part being prepared using the above method sequentially consists of basal layer 1, silver electrode layer 2, function
Layer 3, upper silver electrode layer 4, basal layer 1, silver electrode layer 2, functional layer 3, upper silver electrode layer 4 are sequentially connected,
Silver electrode layer 2, functional layer 3, upper silver electrode layer 4 are prepared using Whote-wet method,
For upper silver electrode layer 4 using silver-colored symmetry electrode, silver-colored symmetry electrode is cold electrode.
Based on the above technical solutions, substrate 1 is cleaned repeatedly using cleaning agent in step 1, then it is put successively
Enter and impregnated in deionized water, acetone and ethyl alcohol, and each ultrasonic 30 minutes, it is dried through nitrogen stream.
Based on the above technical solutions, wet method described in step 2 makes silver electrode layer 2, uses technique as spin-coating method, turns
Speed is 3000 rpms, and the spin-coating film time is 40 seconds, and gained sample in hot platform is made annealing treatment, waves solvent
Hair, annealing temperature 180 degree, annealing time 30min form silver electrode layer 2, and the thickness range of the silver electrode layer 2 of gained is 70nm
To 100nm.
Based on the above technical solutions, wet method described in step 3 makes functional layer 3, and technique is used to wait to revolve for spin-coating method
After painting, 3 one end of functional layer is wiped using the cotton swab for being moistened with good solvent, the contact mouth of silver electrode layer 2 is formed, then carries out
Annealing, makes solvent volatilize.Annealing way is hot platform.
Based on the above technical solutions, wet method described in step 4 makes upper silver electrode layer 4, uses technique as spraying process,
Gained sample in hot platform is made annealing treatment, solvent is made to volatilize, annealing temperature 180 degree, annealing time 30min, in formation
Silver electrode layer 4, the thickness range of the upper silver electrode layer 4 of gained is 100nm to 150nm.
Based on the above technical solutions, 1 material of basal layer be transparent material or opaque material,
Transparent material includes but not limited to quartz, glass, organic glass, flexible base board；
Opaque material includes but not limited to ceramics, silicon chip.
Based on the above technical solutions, 2 material of silver electrode layer is silver paste, silver content 18w% in silver paste,
The existence form of silver is no particle, wherein resin containing organic molecule, solvent is ethyl alcohol, by mass percentage, silver paste：Ethyl alcohol
For 4:1.
Based on the above technical solutions, 3 material of functional layer is the material with polymerization electrical bistable property.
Based on the above technical solutions, the material that the functional layer 3 polymerize electrical bistable property has various structures class
Type, the structure type of material include but not limited to single polymer layer, mixed polymer, multiple layer polymer, doped polymer.
Based on the above technical solutions, upper 4 material of silver electrode layer is silver paste, silver content in silver paste
18w%, silver-colored existence form is no particle, wherein resin containing organic molecule, solvent is ethyl alcohol, by mass percentage, silver
Slurry：Ethyl alcohol is 1:1.
It is specific embodiment below.
The material of basal layer 1 is glass；
The material of silver electrode layer 2 is silver paste, and silver paste is directly bought in Kunshan Hai Si Electronic Science and Technology Co., Ltd.s SC-100,
By the dilution of former silver paste by mass percentage, silver paste：Ethyl alcohol is 4:1；Through repetition test, ratio is 4:It is best ratio when 1, effect
Fruit is best；
The material of functional layer 3 for polyethylene glycol oxide PEO and 3- hexyl thiophenes P3HT polymer blend, PEO and P3HT's
Mass ratio is 36mg:4mg is dissolved in the chlorobenzene of good solvent 1ml；
The material of upper silver electrode layer 4 is silver paste, and silver paste is directly bought in Kunshan Hai Si Electronic Science and Technology Co., Ltd.s SC-
100, by the dilution of former silver paste by mass percentage, silver paste：Ethyl alcohol is 1:1；Through repetition test, ratio is 1:It is optimal ratio when 1
Rate, effect are best；
Making step is as follows：
Step 1：Substrate 1 is cleaned up (substrate sizes 16.1mm*16.2mm) using glass cleaner, then by its according to
Secondary insert in deionized water, acetone and alcohol is impregnated, and each ultrasonic 30 minutes, it is dried through nitrogen stream；
Step 2：Claim former silver paste 0.4g, add in 0.1g ethyl alcohol and form solution, addition size is the magneton of C7 in magnetic agitation
Be sufficiently stirred on machine 24 it is small when, 40 degree of whipping temp is sufficiently mixed it, wherein the mass ratio of silver paste and ethyl alcohol be 4:1；It will be mixed
The wet solution of conjunction, which is spun on glass substrate layers 1, makes silver electrode layer 2, after treating that spin coating finishes, is made annealing treatment, made molten
Agent is volatilized completely；
The process conditions of wet method spin coating are：3000 rpms of rotating speed, 40 seconds time；
The process conditions of annealing are：Under air environment, hot platform heating, heating temperature 180 degree, heating time
30min, 2 thickness range of gained silver electrode layer are 70nm to 100nm；
Step 3：Weigh polyethylene oxide PEO (36mg) respectively, poly- 3- hexyl thiophenes P3HT (4mg) is completely dissolved in
Chlorobenzene solution (1ml)；Gained liquid wet method spin coating is made on silver electrode layer 2, makes functional layer 3.After treating spin coating, use
The cotton swab for being moistened with chlorobenzene wipes its one side, forms the contact mouth of silver electrode layer 2, is made annealing treatment afterwards, wave its solvent
Hair, obtains functional layer 3；
The process conditions of spin coating are：6000 rpms of rotating speed, 60 seconds time；
The process conditions of annealing are：Under glove box environment, hot platform heating, 70 degree of heating temperature, time 120min；
Step 4：Claim former silver paste 0.5g, add in 0.5g ethyl alcohol and form solution, addition size is the magneton of C7 in magnetic agitation
Be sufficiently stirred on machine 24 it is small when, 40 degree of whipping temp is sufficiently mixed it, wherein the mass ratio of silver paste and ethyl alcohol be 1:1；It will be through
Device after step 4 makes upper silver electrode layer 4 using watering can spraying.To be sprayed finish is made annealing treatment afterwards, makes its solvent
It volatilizees, 4 thickness range of silver electrode layer is 100nm to 150nm on gained.It is made a kind of and is based on Whote-wet method silver symmetry electrode polymer
Dual stabilization part；
The process conditions of annealing are：Under air environment, hot platform heating, heating temperature 180 degree, time 30min.
The content not being described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (6)
1. a kind of preparation method based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, which is characterized in that including as follows
Step：
Step 1, by basal layer (1) washes clean；
Step 2, wet method makes silver electrode layer (2) on basal layer (1)；
Step 3, wet method makes functional layer (3) on silver electrode layer (2)；
Step 4, wet method makes upper silver electrode layer (4) in functional layer (3)；
It makes silver electrode layer (2) to complete under air environment with upper silver electrode layer (4), making functional layer (3) is in air or hand
It is completed in casing；
Functional layer (3) material is the material with polymerization electrical bistable property,
The material of functional layer (3) has various structures type, and the structure type of material includes but not limited to single polymer layer, mixing
Polymer, multiple layer polymer, doped polymer；
Wet method described in step 2 makes silver electrode layer (2), uses technique as spin-coating method, and rotating speed is 3000 rpms, spin-coating film
Time is 40 seconds, and gained sample in hot platform is made annealing treatment, solvent is made to volatilize, annealing temperature 180 degree, annealing time
30min forms silver electrode layer (2), and the thickness range of the silver electrode layer (2) of gained is 70nm to 100nm；
Wet method described in step 3 makes functional layer (3), uses technique as spin-coating method, after treating spin coating, using being moistened with good solvent
Cotton swab erasing functional layer (3) one end, formed silver electrode layer (2) contact mouth, then made annealing treatment, solvent made to volatilize,
Annealing way is hot platform；
Wet method described in step 4 makes upper silver electrode layer (4), uses technique as spraying process, gained sample is moved back in hot platform
Fire processing, makes solvent volatilize, annealing temperature 180 degree, annealing time 30min, silver electrode layer (4) in formation, the upper silver electricity of gained
The thickness range of pole layer (4) is 100nm to 150nm.
2. the preparation method as described in claim 1 based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, feature
It is：Basal layer (1) is cleaned repeatedly using cleaning agent in step 1, then it is inserted successively in deionized water, acetone and ethyl alcohol
It impregnates, and each ultrasonic 30 minutes, it is dried through nitrogen stream.
3. the preparation method as described in claim 1 based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, feature
It is：Basal layer (1) material be transparent material or opaque material,
Transparent material includes but not limited to quartz, glass, organic glass, flexible base board；
Opaque material includes but not limited to ceramics, silicon chip.
4. the preparation method as described in claim 1 based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, feature
It is：Silver electrode layer (2) material is silver paste, and silver content 18w% in silver paste, silver-colored existence form is no particle,
In resin containing organic molecule, solvent is ethyl alcohol, by mass percentage, silver paste：Ethyl alcohol is 4:1.
5. the preparation method as described in claim 1 based on Whote-wet method silver symmetry electrode electrostrictive polymer bistable device, feature
It is：Upper silver electrode layer (4) material is silver paste, and silver content 18w% in silver paste, silver-colored existence form is no particle,
Wherein resin containing organic molecule, solvent are ethyl alcohol, by mass percentage, silver paste：Ethyl alcohol is 1:1.
It is 6. a kind of as the preparation of Claims 1 to 5 any one of them method is double based on Whote-wet method silver symmetry electrode electrostrictive polymer
Steady device, it is characterised in that：Sequentially consist of basal layer (1), silver electrode layer (2), functional layer (3), upper silver electrode layer
(4), basal layer (1), silver electrode layer (2), functional layer (3), upper silver electrode layer (4) are sequentially connected,
Silver electrode layer (2), functional layer (3), upper silver electrode layer (4) are prepared using Whote-wet method,
For upper silver electrode layer (4) using silver-colored symmetry electrode, silver-colored symmetry electrode is cold electrode.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719637A (en) * | 2005-07-15 | 2006-01-11 | 华南理工大学 | Method for making cathode of organic/polymer LED |
| CN1815771A (en) * | 2005-12-22 | 2006-08-09 | 复旦大学 | Erasable, readable molecular-base electric double-stable negative-resistance component |
| CN101684214A (en) * | 2008-09-26 | 2010-03-31 | 昆山海斯电子有限公司 | Nanoparticle conductive ink and preparation method thereof |
| CN102299264A (en) * | 2010-06-23 | 2011-12-28 | 海洋王照明科技股份有限公司 | Organic solar cell and making method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7482621B2 (en) * | 2003-02-03 | 2009-01-27 | The Regents Of The University Of California | Rewritable nano-surface organic electrical bistable devices |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719637A (en) * | 2005-07-15 | 2006-01-11 | 华南理工大学 | Method for making cathode of organic/polymer LED |
| CN1815771A (en) * | 2005-12-22 | 2006-08-09 | 复旦大学 | Erasable, readable molecular-base electric double-stable negative-resistance component |
| CN101684214A (en) * | 2008-09-26 | 2010-03-31 | 昆山海斯电子有限公司 | Nanoparticle conductive ink and preparation method thereof |
| CN102299264A (en) * | 2010-06-23 | 2011-12-28 | 海洋王照明科技股份有限公司 | Organic solar cell and making method thereof |
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