CN109168323A - Rear surface of solar cell paste for use in electrode composition - Google Patents
Rear surface of solar cell paste for use in electrode composition Download PDFInfo
- Publication number
- CN109168323A CN109168323A CN201780024350.3A CN201780024350A CN109168323A CN 109168323 A CN109168323 A CN 109168323A CN 201780024350 A CN201780024350 A CN 201780024350A CN 109168323 A CN109168323 A CN 109168323A
- Authority
- CN
- China
- Prior art keywords
- weight
- frit
- solar cell
- rear surface
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022441—Electrode arrangements specially adapted for back-contact solar cells
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
-
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Abstract
It is excellent that the application provides a kind of Moisture stability, can improve electrode adhesion, so as to realize high transfer efficiency and open-circuit voltage solar battery rear electrode paste.In addition, the application provides a kind of stability and solar battery that is excellent in reliability and can be realized high-energy conversion efficiency using rear electrode paste composite.
Description
Technical field
The present invention relates to a kind of rear surface of solar cell paste for use in electrode composition and the solar batteries formed using it.
Background technique
Solar battery is to absorb the photoelectric effect that electrons and holes are generated from the luminous energy that the sun occurs, generation electric current,
Voltage.It has the semiconductor substrate (substarte) and emitter layer (emmitter layer) for constituting pn-junction, on emitter
Portion forms the front electrode being powered with above-mentioned emitter, and the back side being powered with substrate is formed in the another side opposite with light incident surface
Electrode.
Light due to being absorbed into solar battery has various wavelength, and refractive index is different according to wavelength, therefore exists and inhale
Receive good wave-length coverage.Generally, the light of long wavelength is not easy absorption and penetrates solar battery since refractive index is low.Cause
This, is also equipped with passivation layer, which makes the light penetrated reflection and make it again by solar battery, to play increase light
Absorption effect.
PERC type (passivation emitter rear-face contact type, Passivated Emitter and Rear Contact Type)
Solar battery is the solar battery for having passivation layer (Passivation Layer) in back surface of the wafer, and increase is incident on
The absorptivity of the light of solar battery, and can prevent electronics by generating and hole in conjunction with and bring is lost.This
When, passivation layer is generally by alumina layer (Al2O3LAYER it) is constituted with silicon nitride layer (SiNx LAYER), alumina layer is in the sun
It can cell backside generation fixed negative charge (fixed negative charge).Above-mentioned negative electrical charge (negative charge) has
The hole for helping to generate in solar battery is moved to rear electrode, reduce the electronics thus generated and hole in conjunction with
Amount, enables to collect more electrons and holes, so as to improve open-circuit voltage (Voc), increases solar battery effect
Rate.
In this PERC type solar battery, aluminium electrode cannot penetrate passivation layer, therefore opening (opening) makes
It is pasted to form local back surface field layer (Back Surface Field Layer, BSF layer) with aluminium.At this moment, due to aluminium (Al)
With the difference of the diffusion velocity of silicon (Si) and generate gap (void), this will reduce open-circuit voltage (Voc) and reduce transfer efficiency.
Under normal circumstances, above-mentioned gap is generated since the diffusion velocity of silicon is faster than aluminium, it is desirable that exploitation changes the skill for pasting interior ingredient
Art.
In addition, when aluminium paste cannot be reacted with passivation layer in the case where, due to aluminium electrode poor adhesive force and generate fine aluminium
Particle, the particle of generation lead to the pollution of face portion and reduce transfer efficiency.Such case is in production solar cell module youngster
In the case where also become problem.In addition, existing aluminium paste is poor for the stability of moisture.
Therefore, it needs to research and develop the electrode adhesion that can embody certain level or more at present and Moisture stability is excellent
Aluminium paste.
Summary of the invention
The present invention is proposed to solve the problems, such as described above, and its purpose is to provide a kind of Moisture stability is excellent
The rear electrode of solar battery that is different, can improving electrode adhesion and can be realized high transfer efficiency and open-circuit voltage is used
Paste.
In addition, it is an object of the invention to provide solar battery using above-mentioned rear electrode paste.
In order to realize that purpose as described above, a mode of the invention are a kind of combination of rear surface of solar cell paste for use in electrode
Object, it includes:
(a) aluminium electroconductive powder;
(b) contain SiO2、ZnO、Bi2O3And B2O3Frit;And
(c) organic media.
The rear surface of solar cell paste for use in electrode composition of a mode according to the present invention, wherein above-mentioned frit can be with
SiO comprising 5 to 30 weight %2, the ZnO of 1 to 20 weight %, 10 to 60 weight % Bi2O3And 5 to 20 weight %
B2O3。
Another way of the invention provides a kind of rear surface of solar cell paste for use in electrode composition, it includes:
(a) aluminium electroconductive powder;
(b ') contains SiO2、ZnO、Bi2O3、B2O3, PbO and Al2O3Frit;And
(c) organic media.
At this moment, according to the rear surface of solar cell paste for use in electrode composition of aforesaid way, wherein above-mentioned frit includes 5
To the SiO of 30 weight %2, the ZnO of 1 to 20 weight %, 10 to 60 weight % Bi2O3, 5 to 20 weight % B2O3, 5 to 50 weights
Measure the Al of the weight of PbO and 1 to 20 % of %2O3。
The rear surface of solar cell paste for use in electrode composition of an embodiment according to the present invention, wherein above-mentioned frit
Average grain diameter can be 0.5 to 5.0 μm.
The rear surface of solar cell paste for use in electrode composition of an embodiment according to the present invention, wherein relative to total weight,
It may include the above-mentioned frit of 0.6 to 20 weight %.
The rear surface of solar cell paste for use in electrode composition of an embodiment according to the present invention, wherein above-mentioned aluminium electric conductivity
The average grain diameter of powder can be 2 to 10 μm.
The rear surface of solar cell paste for use in electrode composition of an embodiment according to the present invention, wherein above-mentioned organic media
It can be comprising the organic selected from one or more of cellulose-based resin, acrylic resin and polyethylene-based resin
Agent is dissolved in organic media made of solvent.
In addition, the present invention provides and a kind of has conventional type (Conventional using what above-mentioned paste composite was formed
) or the solar battery of PERC type (Passivated Emitter and Rear Cell type) structure type.
Rear surface of solar cell paste for use in electrode composition according to the present invention has the excellent in stability to moisture and can
The advantages of improving electrode adhesion and can be realized high transfer efficiency and open-circuit voltage.
In addition, the present invention, which has, is capable of providing stability and excellent in reliability and can be realized height using above-mentioned paste composite
Energy conversion efficiency solar battery the advantages of.
Specific embodiment
In the following, to rear surface of solar cell paste for use in electrode composition of the invention, using its manufacture solar battery it is detailed
Carefully it is illustrated.It can further more fully understand that the present invention, following embodiments are for example by following embodiments
Show the present invention, and does not limit claimed protection scope.At this moment, as long as the technical terms and scientific words that use
Without other definition, then refer to the normally understood meaning of personnel in the technical field that the present invention belongs to Conventional wisdom.
Present invention can apply to conventional type (Conventional type) or PERC type (Passivated
Emitter and Rear Cell type) structure solar battery.Wherein, solar battery illustrated below is PERC
Type, but the present invention is not necessarily limited to PERC type solar battery and applies.
PERC type solar battery overleaf has passivation layer (passivation), can be improved the light of long wavelength region
Absorptivity, reduce electronics and hole in conjunction with and improve short circuit current (Isc) and open-circuit voltage (Voc), so as to mention
The efficiency of high solar battery.However, needing to form local back surface field layer (Local BSF since there are passivation layers
Layer), in the case where application aluminium paste, the asking in the presence of generation gap (void) due to the difference of the diffusion velocity of aluminium and silicon
Topic.In addition, this phenomenon may be decreased electrode adhesion and reduce transfer efficiency, it is also difficult to ensure the reliability of module youngster.
The present inventor is by providing the combined rear electrode paste composite comprising special component as a result, to inhibit
Gap as described above occurs, and the efficiency of solar battery can be made to maximize, while can improve existing for the steady of moisture
The physical property of qualitative weak aluminium paste, so as to complete the present invention.
In the present invention, rear surface of solar cell paste for use in electrode composition both can be applied to conventional type solar battery,
It can be applied to the PERC type solar battery comprising passivation layer, but be not limited to comprising usually as silicon known to solar battery
The various effects of semiconductor device.In addition, paste composite according to the present invention is due to excellent between silicon and aluminium interface
Reactivity and local BSF layer can be effectively formed, so as to prevent pollution caused by passivation layer.
The first method of rear surface of solar cell paste for use in electrode composition according to the present invention includes:
(a) aluminium electroconductive powder;
(b) contain SiO2、ZnO、Bi2O3And B2O3Frit;And
(c) organic media.
Above-mentioned frit is free from forming by lead, each ingredient as Moisture stability, electrode adhesion it is main because
Element and act on, these ingredients can be realized synergy by the combination with other compositions in paste composite.
The frit of first method according to the present invention modifying ingredients can contain in the range of achieving the object of the present invention
Amount, can preferably comprise the SiO of 5 to 30 weight %2, the ZnO of 1 to 20 weight %, 10 to 60 weight % Bi2O3And 5 to
The B of 20 weight %2O3.At this moment, the insufficient part of total weight of mentioned component can also include other more than at least one
Oxide.As specific example, may include selected from P2O5、Na2O、K2O and Sb2O3In any one more than.It is above-mentioned to be selected from
P2O5、Na2O and K2Content of any one ingredient in frit in O is 0.1 to 3 weight %, can preferably comprise 0.5
To 2 weight %.In addition, above-mentioned Sb2O3Content in frit is 5 to 20 weight %, can preferably comprise 10 to 16 weights
Measure %.In the case where meeting the above range, excellent Moisture stability and electrode adhesion can not only be realized, improving too
It is more preferable in terms of positive energy battery performance.
On the basis of the above-mentioned 1st aspect of the present invention further, rear surface of solar cell electrode according to the present invention
It can also include PbO and Al with paste composite2O3In any one ingredient as frit compositions.At this moment, although solar battery
Performance may be reduced slightly, but preferable in terms of ensuring Moisture stability and improving electrode adhesion.
In turn, the present invention can be realized Moisture stability and electrode attachment in the case where solar cell properties do not reduce
The raising of power provides the second method of following rear surface of solar cell paste for use in electrode compositions according to the present invention.
The rear surface of solar cell paste for use in electrode composition of second method according to the present invention includes:
(a) aluminium electroconductive powder;
(b ') contains SiO2、ZnO、Bi2O3、B2O3, PbO and Al2O3Frit;And
(c) organic media.
Above-mentioned frit is leaded composition, in the combination and paste composite by constituting the ingredient of the composition other at
The combination divided, can be improved Moisture stability and electrode adhesion, and then ensure quality stability, reliability, so as to
Enhance durability and it is more preferable.
The frit of second method according to the present invention can in the range of achieving the object of the present invention modifying ingredients content,
It is preferred that may include the SiO of 5 to 30 weight %2, the ZnO of 1 to 20 weight %, 10 to 35 weight % Bi2O3, 5 to 20 weight %
B2O3, 5 to 50 weight % the weight of PbO and 1 to 20 % Al2O3.At this moment, above-mentioned frit compositions are met the above range
In the case where, it is more effective in terms of improving solar cell properties, strengthen electrode adhesion and durability can be further enhanced.
According in the second method of above-mentioned paste composite of the invention, with regard to PbO and Al2O3Combination for, and only include
PbO and Al2O3In any one ingredient the case where compare, include PbO and Al in frit2O3Combination when, in transfer efficiency
Or it can ensure excellent solar cell properties in terms of open circuit voltage characteristic, and can be realized the physical property such as electrode adhesion
Improve and it is more preferable.
At this moment, PbO and Al2O3The component content in frit can be in the range of achieving the object of the present invention respectively
It is adjusted, in durability, electrode adhesion or the aspect of performance for inhibiting generation bubble, model of the preferably PbO in 5 to 50 weight %
In enclosing, Al2O3In the range of 1 to 20 weight %.
As described above, rear surface of solar cell paste for use in electrode composition according to the present invention can be according to the ingredient of frit
It combines and realizes various modes.
In rear surface of solar cell paste for use in electrode composition of the invention, as a concrete example of frit, Ke Yiyou
SiO2、ZnO、Bi2O3、B2O3、P2O5、Na2O、K2O and Sb2O3It constitutes, it, can be by SiO as other concrete examples2、ZnO、Bi2O3、
B2O3、PbO、Al2O3、Na2O、SrO、K2O and Sb2O3It constitutes.
At this moment, above-mentioned frit preferably comprises the SiO of 5 to 30 weight %2, 1 to 20 weight % ZnO, 10 to 60 weights
Measure the Bi of %2O3, 5 to 20 weight % B2O3, 0 to 50 weight % the weight of PbO and 0 to 20 % Al2O3.In satisfaction
In the case where stating range, the appropriate viscosity for maintaining paste especially substantially reduces the diffusion velocity difference between aluminium silicon, can prevent
Interface formed gap (void), improve and electrode between adhesive force, transfer efficiency and open-circuit voltage are excellent, by with other at
/ combination and the efficiency of solar battery can be made to maximize.
Specifically, above-mentioned SiO2Relative to frit total weight, may include 5 to 30 weight %, more preferably comprising 7 to
21 weight %.In addition, ZnO may include 1 to 20 weight % relative to frit total weight, it more preferably include 5 to 16 weights
Measure %.
In addition, Bi2O3It relative to frit total weight, may include 10 to 60 weight %, more preferably include 12 to 45 weights
Measure %.Further, with regard to above-mentioned Bi2O3For, in frit include lead in the case where with PbO and Al2O3Combined ingredient one
It rises in use, preferably comprising 15 to 30 weight % comprising 10 to 35 weight %, this is more preferable in terms of solar cell properties.
As an example, above-mentioned Bi2O3When being used together in frit with PbO in the case that its content is more than 35 weight %,
Transfer efficiency and open-circuit voltage may be decreased.
In addition, B2O3It relative to frit total weight, may include 5 to 20 weight %, more preferably include 10 to 15 weights
Measure %.
Above-mentioned frit can also be comprising being selected from PbO and Al2O3In any one more than, at this moment PbO is relative to frit
Total weight may include 5 to 50 weight %, more preferably include 17 to 43 weight %.In addition, Al2O3Relative to frit gross weight
Amount, may include 1 to 20 weight %, more preferably include 4 to 8 weight %.
In the case that ingredient in above-mentioned frit meets respective content range, by with other compositions in frit it
Between combination be more advantageous to further by the aluminium electroconductive powder in paste composite and the combination between organic media
Realize present invention effect to be achieved.
In the case that ingredient more than a certain kind in the ingredient in above-mentioned frit is more than above-mentioned content range, it is difficult to
Expect ingredient combine bring synergy, may make solar cell properties reduce or electrode adhesion reduction, for water
The stability divided reduces.
In the present invention, the main metal component of (a) electroconductive powder is aluminium.This aluminium electroconductive powder can be by single particle
It is formed or mixing has the particle of different characteristics each other and uses.Also the particle of core-shell structure can be used.
Above-mentioned aluminium electroconductive powder it is preferably spherical, according to desired mechanical properties, thin slice can also be used
(flake) shape, plate, amorphous or their combination.
The powder that average grain diameter is 0.5 to 10 μm, preferably 1 to 9 μm can be used in above-mentioned aluminium electroconductive powder.It can be more
It is preferable to use 1 to 7 μm of powder.In the case where meeting the above range, it can be ensured that dispersibility and compactness make solar-electricity
The electrical property in pond optimizes, therefore more preferably.Additionally, it is preferred that being used in mixed way the electric conductivity powder with average grain diameter different from each other
End.
In addition, the BET of above-mentioned electroconductive powder is 0.2 to 3.0m2/ g is, it is preferable to use 0.4 to 2.0m2The powder of/g, full
In the case where sufficient above range, it is more advantageous to the electrical characteristics for improving solar battery.
Above-mentioned electroconductive powder may include conductive metal in addition to aluminum, but be not particularly limited to this.As
One example, can be suitably comprising such as silver, copper, nickel, palladium, platinum, chromium, cobalt, tin, zinc, iron, iridium, rhodium, tungsten, molybdenum or magnesium in addition to aluminium
Metal or alloy in addition.
Above-mentioned aluminium electroconductive powder can contain 60 to 95 weight %, preferably comprise 65 relative to paste composite total weight
To 85 weight %.In the case where meeting above-mentioned content, it is able to suppress generation and mutually separates, viscosity preferably has printing excellent
The advantages of.
Frit includes as illustrated in first method, second method, Third Way and fourth way in the present invention
Special component, and formed and pasted with organic media, thus passivation layer when being especially applied to PERC type solar battery, with the back side
Between reactivity it is excellent, improve the adhesive force between electrode and solar battery efficiency can be made to maximize, and can
Ensure Moisture stability.
In the present invention, content range of the above-mentioned frit in rear electrode paste all compositions of the invention can be excellent
It is selected as 0.1 to 5.0 weight %, more preferably 0.5 to 2.0 weight %.In the case where meeting above-mentioned content range, at interface
Reactivity is excellent, and electrode adhesion is excellent and can reduce contact resistance, solar battery efficiency can be made to maximize.
The glass transition temperature (Tg) of above-mentioned frit can be 300 to 600 DEG C, preferably 300 to 500 DEG C.In addition,
The softening point (Ts) of (b) frit of the invention can be 350 to 750 DEG C, preferably 400 to 650 DEG C.Meeting above-mentioned glass
In the case where changing transition temperature and softening point range, it is more advantageous to and realizes desired physical property effect.
In addition, the average grain diameter of above-mentioned frit is 0.5 to 5.0 μm, preferably 1.0 to 3.0 μm.It is meeting the above range
In the case where, when can prevent from being formed electrode there is a situation where needle pore defect and it is preferred that.
As an example, above-mentioned frit is by carrying out cooling step after melting constituent together under atmospheric pressure
And it is allowed to that there is vitreous property on the whole and manufacture.By melt process, each constituent of frit it is intermolecular
Bonding fracture and lose the property as metal oxide, in the molten state, each ingredient equably mixes, and passes through cooling
And become the nature of glass.At this moment, melting temperature and time is without too big restriction, but can preferably melting temperature be 800 to
1500 DEG C, implement under conditions of 10 minutes to 1 hour melting time.
In the present invention, (c) organic media (vehicle) is and the physical mixed for the inorganic constituents pasted with rear electrode
The viscosity and rheological behavior for being conducive to printing are assigned to composition.
Above-mentioned organic media can be used commonly used in the organic media of electrode of solar battery paste, as an example,
It can be the mixture of macromolecule and solvent.Can be preferably selected from TXIB (trimethylpentanediol diisobutyrate,
Trimethyl Pentanyl Diisobutylate), dibasic ester (Dibasic ester), BC (butyl carbitol, BUTYL
CARBITOL), acetate of butyl carbitol, butyl carbitol, butyl cellosolve, butyl cellosolve acetate, propylene glycol list first
Ether, dipropylene glycol monomethyl ether, dimethyl adipate, dimethyl glutarate, propylene glycol monomethyl ether propionate, ether propionate ester, terpene
Product alcohol (terpineol), propylene glycol methyl ether acetate, dimethylaminoformaldehyde, methyl ethyl ketone, gamma-butyrolacton, ethyl lactate and 2,
Addition is selected from ethyl cellulose in the solvent of one or more of -1,3 pentanediol mono isobutyrate of 2,4- trimethyl (Texanol)
The cellulose-based resins such as element, methylcellulose, nitrocellulose, cellulose esters;The polymethylacrylic acid of rosin (rosin) or alcohol
One of polyethylene-based resins such as the acrylic resins such as ester, acrylate and polyvinyl alcohol, polyvinyl butyral with
On resin made of mixture.More preferably use acetate of butyl carbitol, -1,3 pentanediol list isobutyl of 2,2,4- trimethyl
Acid esters and terpineolMixed solvent.
Above-mentioned organic media is 10 weight to 40 weight %, preferably 15 weight to 30 weights relative to paste composite total weight
Measure %.In the case where meeting the above range, can readily dispersed electroconductive powder, and can prevent calcining after residual carbon
Caused resistance increases and the transfer efficiency of solar battery reduces.
Rear surface of solar cell paste for use in electrode of the invention is special in order to improve flowing other than above-mentioned constituent element
Property, process characteristic and stability, can also add conventional additive.As above-mentioned additive, dispersing agent, thickening can be enumerated
Agent, thixotropic agent, levelling agent, plasticizer, viscosity stabiliser, defoaming agent, pigment, ultra-violet stabilizer, antioxidant, coupling agent
Deng but not limited to this.
As above-mentioned dispersing agent, can enumerate SOLSPERSE, BYK company of LUBRISOL company DISPERBYK-180,
110,996 and 997 etc., but not limited to this.As above-mentioned tackifier, BYK-410,411,420 of BYK company can be enumerated
Deng but not limited to this.As above-mentioned thixotropic agent, THIXATROL MAX of ELEMENTIS company, BYK company can be enumerated
ANTI-TERRA-203,204,205 etc., but not limited to this.As above-mentioned levelling agent, the BYK- of BYK company can be enumerated
3932P, BYK-378, BYK-306, BYK-3440 etc., but not limited to this.Organic additive is pasted relative to rear electrode
The whole 100 weight % of composition, can contain about 1 to 20 weight %.
The present invention, which is provided, has conventional type (Conventional using what above-mentioned rear electrode paste composite was formed
) or the solar battery of PERC type (Passivated Emitter and Rear Cell type) structure type.
Wherein, the PERC type solar battery of an embodiment according to the present invention includes: the substrate of the first conductive type;It is formed
The emitter layer of the second conductive type on aforesaid substrate;The antireflection film being formed on above-mentioned emitter layer;It penetrates through above-mentioned anti-
Reflectance coating and the front electrode being connect with above-mentioned emitter layer;With the passivation layer and rear electrode at the back side of aforesaid substrate.
The substrate of above-mentioned the first conductive type is selected from p-type or N-type, and the emitter layer selection of the second conductive type has and substrate phase
The material of opposite conductivity-type.In order to form P+ layers, III A race element of doping is as impurity, and in order to form N+ layers, doping VA race element is made
For impurity.For example, B, Ga, In can be adulterated in order to form P+ layers, in order to form N+ layers, P, As, Sb can be adulterated.Above-mentioned base
Interface between plate and emitter layer forms P-N junction, this is the part for receiving sunlight and generating electric current by photoelectric effect.
P layers and N layers are respectively attracted to by the electrons and holes that photoelectric effect generates, and are moved respectively to and substrate lower part and hair
The electrode of emitter layer upper bond, and loaded by applying to electrode, it can use in the electricity wherein generated.
Above-mentioned antireflection film reduces the reflectivity for being incident on the sunlight of solar battery front side.When the reflectivity of sunlight
When reduction, the light quantity for reaching P-N junction increases, and the short circuit current of solar battery increases, and the transfer efficiency of solar battery improves.
As an example, antireflection film can have selected from silicon nitride film, the silicon nitride film comprising hydrogen, silicon oxide film, silicon oxynitride
Any one monofilm or the two or more multiple membrane structures being composed in film, but not limited to this.
After front electrode carries out silk-screen printing with paste using front electrode, formed by being heat-treated, by punch through,
Front electrode passes through antireflection film and contacts with emitter layer.
Above-mentioned passivation layer formation is at the back side of substrate, by aluminum oxide (Al2O3) formed, it can also be by Si oxide
(SiO2) or silicon nitride (SiN) formation.Above-mentioned passivation layer can be formed with the thickness of 1~50nm.This can pass through atomic layer deposition
Area method (ALD, Atomic Layer Deposition) or plasma enhanced chemical vapor deposition method (PECVD, Plasma
Enhanced CVD) it is deposited.
Rear electrode can be coated to be formed by silk-screen printing at the back side of passivation layer.Above-mentioned rear electrode utilizes
Rear surface of solar cell paste for use in electrode composition according to the present invention.Above-mentioned paste composite passes through heat treatment after coating and drying
Process is calcined and is formed.Above-mentioned rear electrode is collected the charge i.e. hole for carrying out self-reference substrate and is exported to external device (ED).
In the following, an example for enumerating rear surface of solar cell paste for use in electrode according to the present invention is illustrated, but this hair
It is bright to be not limited to following embodiments.
(embodiment 1 to 6 and comparative example 1 to 6)
According to the composition of table 1, the corresponding ingredient in frit is put into reactor and mixed, it is molten at 1100 DEG C
Melt 30 minutes, then uses pure water (H2O it) quenches (Quenching) and makes its quenching.It is crushed and is quenched with ball mill (Ball-mill)
Glass melting object, manufactured the frit with 2 μm of average grain diameter.
Paste composite used for solar batteries according to the present invention has been manufactured using the frit of manufacture.
As electroconductive powder, aluminium powder has been used.It is 5.0 that above-mentioned aluminium powder, which has used the average grain diameter of 74.0 weight %,
μm powder.In addition, the frit of above-mentioned manufacture has used the frit of 1.0 weight %, as adhesive, 2.0 weights have been used
Measure the ethyl cellulose resin (AQUALON company ECN-50) of %.As solvent, the butyl carbitol of 10.0 weight % has been used
Acetic acid esters (Butyl CarbitolAcetate), and 2,2,4- trimethyl -1,3 pentanediol Dan Yi of respectively 5.5 weight %
Butyrate (Texanol) and terpineol (Terpineol) are added to the thixotroping regulator of 1.0 weight % as additive
The additive (Oleic Acid) of (ELEMENTIS company's T HIXATROL MAX) and 1.0 weight %.
(embodiment 7)
The content range of frit is set as 0.5 weight %, the content of terpineol (Terpineol) is changed into 6.0 weights
% is measured, in addition to this, is implemented by method same as Example 1.
(embodiment 8)
In embodiment 7, the content of frit is set as 1.5 weight %, the content of terpineol (Terpineol) is changed into
5.0 weight % are implemented by method same as Example 7 in addition to this.
(embodiment 9)
In embodiment 7, the content of frit is set as 2.0 weight %, the content of terpineol (Terpineol) is changed into
4.5 weight % are implemented by method same as Example 7 in addition to this.
(embodiment 10)
In embodiment 7, the content of frit is set as 2.5 weight %, the content of terpineol (Terpineol) is changed into
4.0 weight % are implemented by method same as Example 7 in addition to this.
(manufacture of solar battery)
Using 156mm crystal silicon wafer, by using POCl in tube furnace (tube furnace, 850 DEG C)3Diffusion
Process adulterates phosphorus (P), so as to form the emitter layer with 80 Ω/sq sheet resistance.Pass through chemical vapour deposition technique
(PECVD) uses precursor SiH4And NH3Silicon nitride film is deposited on above-mentioned emitter layer, is formed with 70nm thickness, to be formed
Antireflection film.In the upper surface of antireflection film coating DPS-1900V7 paste (DAEJOO) and drying.Then, in above-mentioned silicon substrate backboard
It is 2 minutes dry at 250 DEG C after face is coated with the rear electrode paste composite of the above-mentioned manufacture of 1.3g.At this moment, front electrode and back
The coating of face electrode carries out silk-screen printing (utilizing ASYS COMPANY company printing machine), is implemented with certain pattern.
When silk-screen printing, 250 mesh of stainless steel wire of 450mm × 450mm frame has been used.Dry film after silk-screen printing
With a thickness of 23 μm, drying temperature is 250 DEG C.By obtained solar battery silicon substrate in belt calciner, at about 780 DEG C
It peak temperature and is calcined simultaneously under conditions of IN-OUT about 1 minute, to manufacture target solar battery.
The solar simulator (SOL3A) manufactured using ORIEL company, to the electrical characteristics (I-V of the solar battery of manufacture
Characteristic) it is tested.Every kind of paste manufactures 10 samples respectively, and using the average value of 10 samples, by the solar-electricity of manufacture
The characteristic in pond is shown in table 2.
(evaluation)
(1) efficiency (transfer efficiency, open-circuit voltage) of solar battery
The electrode of manufacture determines solar-electricity using solar battery efficiency sensing equipment (pasna company, CT-801)
The transfer efficiency (Eff, %) and open-circuit voltage (Voc, V) in pond.At this moment, for the respective measurement of transfer efficiency and open-circuit voltage
Value, is set as a reference value as 100 for according to the end value of comparative example 1, and the value of measurement is scaled a reference value and is shown opposite
The value compared.
(2) electrode adhesion
In the aluminium electrode face of the solar battery of calcining, adhesive tape (Tape, 3M company 810-ROK) is cut into 5cm or so
And adhere to it completely, then quickly take the adhesive tape of attachment off with 180 ° of angles.At this moment, on adhesive tape complete non-cohesive electrode feelings
The case where the case where condition is labeled as zero, faintly adheres to is labeled as △ (20% or less), is adhered to the state more than it is labeled as
X。
(3) bubble generation time
The solar battery of calcining is immersed in 75 ± 5 DEG C of deionized water (DI water), is confirmed on aluminium electrode surface
The case where at the beginning of generating bubble and recording, bubble is generated after 15 minutes is labeled as ◎.It is right when starting to generate bubble quickly
It is low in the stability of moisture, it can reduce the reliability of solar cell module youngster.
[table 1]
[table 2]
As shown in Table 1 above, it can be confirmed that embodiment according to the present invention 1 to 3 is that the paste comprising lead-less glasses material combines
Object, transfer efficiency are up to 102.22%, and open-circuit voltage also reaches 100.89%, so that not only solar battery efficiency is excellent
It is different, and meet electrode adhesion and bubble generation time.Furthermore it is possible to confirm that embodiment according to the present invention 4 to 6 is to include
Contain PbO and Al2O3Frit paste composite, and there is solar battery efficiency, electrode adhesion and prevent bubble
Effect.On the other hand, it in comparative example 1 to 5, with the difference existed with the composition of frit according to the present invention, not only converts
The problems such as efficiency and open-circuit voltage significantly reduce, and there are electrode adhesion reduction, generate bubble.
In addition, embodiment according to the present invention 7 to 9 is to change the example for pasting interior frit content, transfer efficiency and open circuit
Voltage is excellent, and electrode adhesion and the generation of anti-bubble are had excellent performance.The content of the frit of embodiment 10 is higher and converts
Efficiency and open-circuit voltage performance slightly reduce.
Although this is only in order to help as described above, being illustrated in the present invention by the embodiment limited
It is provided in the further whole understanding present invention, the present invention is not limited to the above embodiments, as long as belonging to the present invention
With the personnel of Conventional wisdom in field, then various modifications and deformation can be realized based on this record.
Therefore, thought of the invention should not be limited to the embodiment of explanation, it may be said that be not only claimed
Range, and the deformation whole forms impartial or with equivalence with the scope of protection of present invention belong to inventive concept
Range.
Claims (11)
1. a kind of rear surface of solar cell paste for use in electrode composition, includes:
(a) aluminium electroconductive powder;
(b) contain SiO2、ZnO、Bi2O3And B2O3Frit;And
(c) organic media.
2. rear surface of solar cell paste for use in electrode composition according to claim 1, wherein (b) frit includes 5
To the SiO of 30 weight %2, the ZnO of 1 to 20 weight %, 10 to 60 weight % Bi2O3And 5 to 20 weight % B2O3。
3. a kind of rear surface of solar cell paste for use in electrode composition, includes:
(a) aluminium electroconductive powder;
(b ') contains SiO2、ZnO、Bi2O3、B2O3, PbO and Al2O3Frit;And
(c) organic media.
4. rear surface of solar cell paste for use in electrode composition according to claim 3, wherein (the b ') frit includes
The SiO of 5 to 30 weight %2, the ZnO of 1 to 20 weight %, 10 to 60 weight % Bi2O3, 5 to 20 weight % B2O3, 5 to 50
The Al of the weight of PbO and 1 to 20 % of weight %2O3。
5. rear surface of solar cell paste for use in electrode composition according to claim 1, wherein the average grain of the frit
Diameter is 0.5 to 5.0 μm.
6. rear surface of solar cell paste for use in electrode composition according to claim 3, wherein the average grain of the frit
Diameter is 0.5 to 5.0 μm.
7. rear surface of solar cell paste for use in electrode composition according to claim 1, wherein relative to composition gross weight
Amount, the frit comprising 0.1 to 5.0 weight %.
8. rear surface of solar cell paste for use in electrode composition according to claim 3, wherein relative to composition gross weight
Amount, the frit comprising 0.1 to 5.0 weight %.
9. rear surface of solar cell paste for use in electrode composition according to claim 1, wherein the aluminium electroconductive powder
Average grain diameter is 0.5 to 10 μm.
10. rear surface of solar cell paste for use in electrode composition according to claim 1, wherein the aluminium electroconductive powder
Average grain diameter be 0.5 to 10 μm.
11. a kind of solar battery is formed using paste composite described in any one of any one of claims 1 to 10 10, and is had normal
Formalism or PERC type structure.
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KR10-2016-0046907 | 2016-04-18 | ||
KR20160046907 | 2016-04-18 | ||
PCT/KR2017/004129 WO2017183881A1 (en) | 2016-04-18 | 2017-04-18 | Paste composition for rear surface electrode of solar cell |
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CN109168323A true CN109168323A (en) | 2019-01-08 |
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KR (1) | KR20170119300A (en) |
CN (1) | CN109168323A (en) |
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Cited By (3)
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CN114628057A (en) * | 2022-02-11 | 2022-06-14 | 广州市儒兴科技股份有限公司 | Organic carrier and application thereof |
DE102022122802A1 (en) | 2022-08-19 | 2024-02-22 | Triton Hydrogen Ltd | Sealing can be used as a hydrogen barrier |
CN114628057B (en) * | 2022-02-11 | 2024-06-07 | 广州市儒兴科技股份有限公司 | Organic carrier and application thereof |
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KR102285734B1 (en) * | 2020-11-27 | 2021-08-05 | 주식회사 제이솔루션 | Conductive additive for solar cell module and manufacturing method thereof |
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KR20170119300A (en) | 2017-10-26 |
WO2017183881A1 (en) | 2017-10-26 |
TW201803943A (en) | 2018-02-01 |
TWI657119B (en) | 2019-04-21 |
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