CN113299791A - Defoaming type texturing method for photovoltaic polycrystalline silicon - Google Patents
Defoaming type texturing method for photovoltaic polycrystalline silicon Download PDFInfo
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002253 acid Substances 0.000 claims abstract description 49
- 230000000694 effects Effects 0.000 claims abstract description 37
- 229920005591 polysilicon Polymers 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000012528 membrane Substances 0.000 claims description 33
- 210000002808 connective tissue Anatomy 0.000 claims description 31
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 22
- 239000000835 fiber Substances 0.000 claims description 19
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 11
- 239000000919 ceramic Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000003921 oil Substances 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 210000002268 wool Anatomy 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 230000002452 interceptive effect Effects 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims 3
- 238000006243 chemical reaction Methods 0.000 abstract description 14
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 22
- 230000009471 action Effects 0.000 description 19
- 229910002092 carbon dioxide Inorganic materials 0.000 description 11
- 239000001569 carbon dioxide Substances 0.000 description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 9
- 239000013078 crystal Substances 0.000 description 8
- 238000007789 sealing Methods 0.000 description 8
- 229910052710 silicon Inorganic materials 0.000 description 8
- 239000010703 silicon Substances 0.000 description 8
- 239000003012 bilayer membrane Substances 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 5
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
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- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
- C30B33/08—Etching
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention discloses a defoaming texturing method for photovoltaic polysilicon, which belongs to the technical field of polysilicon processing, can form an isolated environment by attaching defoaming bags by changing the traditional acid-soluble texturing mode, avoid volatilization of acid components, synchronously generate chemical reaction in a micro-absorption mode in the texturing process, generate gas to cause disturbance of the defoaming bags, accelerate the breakage of bubbles on the surface of the polysilicon by using the disturbance and avoid accumulation, simultaneously cause resonance breakage of other bubbles by using instability of the generated gas to form bubbles at the same time, thereby obviously improving the defoaming result, and extrude acid solution in the disturbance process of the defoaming bags to improve the corrosion effect of the defoaming bags on the polysilicon, compared with the prior art, the defoaming texturing method can effectively control the size and uniformity of the textured surface, thereby indirectly improving the efficiency of the photovoltaic cell.
Description
Technical Field
The invention relates to the technical field of polycrystalline silicon processing, in particular to a defoaming type texturing method for photovoltaic polycrystalline silicon.
Background
Photovoltaic: the solar photovoltaic power generation system is a novel power generation system which directly converts solar radiation energy into electric energy by utilizing the photovoltaic effect of a solar cell semiconductor material and has two modes of independent operation and grid-connected operation.
The solar photovoltaic effect, referred to as photovoltaic effect for short, refers to the phenomenon of potential difference between parts of a non-uniform semiconductor or a combination of a semiconductor and a metal when the semiconductor or the metal is illuminated. Photovoltaics are defined as direct conversion of radiation energy. In practice, conversion of solar energy into electric energy is generally referred to, i.e. solar photovoltaic. The solar cell is realized mainly by utilizing a solar panel made of semiconductor materials such as silicon and the like and utilizing illumination to generate direct current, such as a solar cell which is visible everywhere in our daily life.
Polycrystalline silicon is a form of elemental silicon. When molten elemental silicon is solidified under undercooling conditions, silicon atoms are arranged in the form of a diamond lattice into a plurality of crystal nuclei, and if the crystal nuclei grow into crystal grains with different crystal plane orientations, the crystal grains are combined and crystallized into polycrystalline silicon.
In recent years, polycrystalline silicon solar cells are more and more widely applied due to the characteristics of higher conversion efficiency, stable performance and moderate cost, and the yield of the polycrystalline silicon solar cells exceeds that of monocrystalline silicon, so that the polycrystalline silicon solar cells occupy the market dominant position. In order to improve the photoelectric conversion efficiency of the solar cell, a silicon wafer needs to be chemically treated firstly during manufacturing, so that the surface of the silicon wafer is made into a suede with a certain shape, and the reflectivity of the surface of an object can be greatly reduced due to the existence of the suede, thereby increasing the light absorption. The texturing of the polycrystalline silicon wafer is to perform isotropic corrosion on the surface of the silicon wafer through chemical reaction to form a dense pit-shaped surface structure, so that the reflection times of light on the surface of the silicon wafer are increased, the reflectivity of the light is reduced to the maximum extent, the absorption of the light is increased, the short-circuit current (Isc) is improved, and the photoelectric conversion efficiency is further improved.
In the manufacturing process of the polycrystalline silicon solar cell, the texturing on the surface of a silicon wafer is a key link. The effect of texturing directly affects the conversion efficiency of the final cell. Because the polycrystalline silicon wafer is composed of crystal grains with different crystal orientations, an acid solution is mostly used for texturing, but gas generated in the texturing process can form bubbles, and then large bubbles are formed along with the accumulation of surface bubbles, so that the textured surface has larger size and poor uniformity, the color difference among different crystal grains is obvious, the surface reflectivity is higher, and the texturing stability is poor.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a defoaming texturing method for photovoltaic polysilicon, which can form an isolated environment by attaching defoaming bags by changing the traditional acid-soluble texturing mode, avoid volatilization of acid components, synchronously generate chemical reaction in a micro-absorption mode in the texturing process, generate gas to cause disturbance of the defoaming bags, accelerate the breakage of bubbles on the surface of the polysilicon by using the disturbance and avoid accumulation, simultaneously cause resonance breakage of other bubbles by using instability of the generated gas to form bubbles simultaneously, thereby obviously improving the defoaming result, and extrude acid solution in the disturbance process of the defoaming bags to improve the corrosion effect of the defoaming bags on the polysilicon, compared with the prior art, the defoaming method can effectively control the size and uniformity of the textured surface, thereby indirectly improving the efficiency of the photovoltaic cell.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A defoaming texturing method for photovoltaic polycrystalline silicon comprises the following steps:
s1, washing and cleaning the surface of the polycrystalline silicon wafer, drying and preheating to 20 ℃, and then dripping an acid solution to cover the surface of the polycrystalline silicon wafer;
s2, immediately covering the defoaming bag on the surface of the polycrystalline silicon wafer to extrude the acid solution and ensure that the acid solution does not leak from the edge;
s3, heating the polycrystalline silicon wafer in water bath, heating to 30-50 ℃, and keeping the temperature constant, wherein the texturing time is 50-70S;
s4, interfering and breaking the generated bubbles by the defoaming chamber in real time in the texturing process, and avoiding the bubbles from gathering to form large bubbles;
and S5, washing with water for 2-5 times after the wool making is finished to remove the residual acid solution, and then drying and packaging.
Further, the acid solution in the step S1 is prepared by mixing 40-55% by mass of nitric acid, 30-45% by mass of hydrofluoric acid, and the balance of pure water.
Further, the defoaming bag in the step S2 includes a top plate, a disturbance double-layer film, a plurality of position control rods and a plurality of disturbance balls, the disturbance double-layer film is connected to the lower end of the top plate to form a hollow bag-shaped structure, the disturbance balls are uniformly connected to the inner surface of the disturbance double-layer film, the position control rods are connected between the top plate and the disturbance balls, and gas is generated after trace acid solution is absorbed by the disturbance balls, so that the disturbance double-layer film is caused to realize a good defoaming effect on the disturbance of the acid solution, and the positioning effect of the position control rods on the disturbance balls is utilized to indirectly improve the uniformity of wool making.
Further, disturbance double-layer membrane includes inner membrance, adventitia and a plurality of seal cover, the intimal connection is in the inboard of adventitia, the seal cover is evenly inlayed between inner membrance and adventitia, and the seal cover only is connected with the intima, a plurality of bleeder vents corresponding with the seal cover have been seted up on the adventitia, the disturbance ball is inlayed and is linked together in the space that the intima and adventitia formed on the intima, under the normal condition under the self action of gravity and the extrusion of disturbance ball, the bleeder vent on the adventitia can be sealed to the seal cover, when the disturbance ball produced gas and enters into between inner membrance and the adventitia inflation, utilize keeping away from between inner membrance and the adventitia to drive the seal cover and break away from the bleeder vent, then gas release goes out, forms the dual disturbance of adventitia and gas, and the effect is better.
Further, the disturbance bilayer membrane is still including many evenly distributed's water guide fiber, and the water guide fiber inlays and connects on inner membrance and adventitia, water guide fiber both ends extend to the outside of disturbance ball inboard and adventitia respectively, and water guide fiber can carry trace acid solution to disturbance ball department on the one hand, supplies the disturbance ball to absorb and produce gas, and on the other hand can promote the defoaming effect through water guide fiber when the outer membrane disturbance to can stretch into and carry out the disturbance in the hole that has formed.
Further, accuse position pole is including the magnet end, extension rod and the stay cord end that connect gradually, the magnet end is connected with the roof, the stay cord end is connected with the disturbance ball, utilizes the repulsion of magnet end pair disturbance ball, improves the effect of pressing of seal cover on the one hand, and on the other hand repulsion force is unstable relatively, can improve the disturbance of disturbance ball when the action, and the extension rod plays connection effect and extension, avoids the too big gaseous release failure that leads to of repulsion force, and the stay cord end allows the disturbance ball to carry out slight action, with amplitude control for the acceleration of frequency.
Furthermore, the magnet end and the disturbing ball keep a magnetic repulsion effect, the extension rod is made of a hard material, and the pull rope end is made of a flexible material.
Furthermore, the disturbing ball comprises an outer heat conduction sleeve, a magnetic hemisphere and a hollow hemisphere, the magnetic hemisphere and the hollow hemisphere are symmetrically connected, the magnetic hemisphere and the hollow hemisphere are connected to the inner side of the outer heat conduction sleeve in an embedded mode and form a ball body, the magnetic hemisphere is connected with the position control rod, one end, far away from the magnetic hemisphere, of the hollow hemisphere is provided with a gas port, the outer heat conduction sleeve plays the roles of weight reduction and heat conduction, the magnetic hemisphere is used for being matched with the magnet end, and the hollow hemisphere is used for absorbing acid solution to generate gas to trigger defoaming action.
Furthermore, the outer heat conducting sleeve is made of a light heat conducting material, ceramic particles and calcium carbonate particles are filled in the hollow hemisphere, the mixing mass ratio of the ceramic particles to the calcium carbonate particles is 5-10:1, the calcium carbonate particles can generate a chemical reaction after contacting with an acid solution to generate carbon dioxide gas, the ceramic particles can absorb the heat of the carbon dioxide on one hand and can improve the overall instability of the disturbance ball on the other hand, so that the disturbance effect is indirectly improved, the cooled carbon dioxide is heated after being released to form bubbles on the surface of polycrystalline silicon, and then the carbon dioxide is rapidly heated to expand and crack to cause resonance, so that the cracking of other bubbles is accelerated.
Further, the space that roof and disturbance bilayer membrane enclose is filled with the conduction oil, and in close contact with between the disturbance ball, and the conduction oil both can conduct away the heat on the disturbance ball, and the frictional resistance when also can reduce the disturbance ball action simultaneously makes things convenient for floating the migration on it to the conduction oil of liquid has certain transmission effect, can transmit the disturbance phenomenon of single disturbance ball to all the other each disturbance balls on, thereby improves holistic disturbance defoaming effect and homogeneity.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can form full texturing in an isolation environment by changing a traditional acid-soluble texturing mode and pasting the defoaming bag, avoids volatilization of acid components, and synchronously generates chemical reaction in a micro-absorption mode in the texturing process, so that generated gas causes disturbance of the defoaming bag.
(2) The defoaming bag in the step S2 comprises a top plate, a disturbance double-layer film, a plurality of position control rods and a plurality of disturbance balls, wherein the disturbance double-layer film is connected to the lower end of the top plate to form a hollow bag-shaped structure, the disturbance balls are uniformly connected to the inner surface of the disturbance double-layer film, the position control rods are connected between the top plate and the disturbance balls, and gas is generated after trace acid solution is absorbed by the disturbance balls, so that the disturbance double-layer film is caused to achieve a good defoaming effect on the disturbance of the acid solution, and the positioning effect of the position control rods on the disturbance balls is utilized to indirectly improve the texturing uniformity.
(3) Disturbance bilayer membrane includes the inner membrance, adventitia and a plurality of seal cover, inner membrance connection is in the inboard of adventitia, the seal cover is evenly inlayed between inner membrance and adventitia, and the seal cover only with the inner membrance connection, a plurality of bleeder vents corresponding with the seal cover have been seted up on the adventitia, the disturbance ball is inlayed on the intima and is linked together with the space that intima and adventitia formed, normal condition is under the squeezing action of self action of gravity and disturbance ball, the seal cover can seal the bleeder vent on the adventitia, when the disturbance ball produces gas and enters into between inner membrance and the adventitia inflation, utilize keeping away from between inner membrance and the adventitia to drive the seal cover and break away from the bleeder vent, then gaseous release, form adventitia and gaseous dual disturbance, the effect is better.
(4) The double-layer membrane of disturbance is still including many evenly distributed's water guide fibre, and the water guide fibre inlays and connects on inner membrance and adventitia, and water guide fibre both ends extend to the outside of disturbing ball inboard and adventitia respectively, and water guide fibre can carry micro-acid solution to disturbing ball department on the one hand, supplies the disturbing ball to absorb and produce gas, and on the other hand can promote the defoaming effect through the water guide fibre when the adventitia disturbance to can stretch into and carry out the disturbance in the hole that has formed.
(5) Accuse position pole is including the magnet end that connects gradually, extension rod and stay cord end, the magnet end is connected with the roof, the stay cord end is connected with the disturbance ball, utilize the repulsion action of magnet end pair disturbance ball, improve the effect of pressing to the seal cover on the one hand, on the other hand repulsion force is unstable relatively, can improve the disturbance of disturbance ball when the action, the extension rod plays connection effect and extension effect, avoid the too big gaseous release failure that leads to of repulsion force, the stay cord end allows the disturbance ball to carry out slight action, with amplitude control for the acceleration of frequency.
(6) The disturbing ball comprises an outer heat conduction sleeve, a magnetic hemisphere and a hollow hemisphere, the magnetic hemisphere and the hollow hemisphere are symmetrically connected, the magnetic hemisphere and the hollow hemisphere are embedded and connected to the inner side of the outer heat conduction sleeve and form a ball body, the magnetic hemisphere is connected with the position control rod, one end of the hollow hemisphere, which is far away from the magnetic hemisphere, is provided with a gas port, the outer heat conduction sleeve plays a role in weight reduction and heat conduction, the magnetic hemisphere is used for being matched with the magnet end, and the hollow hemisphere is used for absorbing acid solution to generate gas to trigger defoaming action.
(7) The outer heat conducting sleeve is made of light heat conducting materials, ceramic particles and calcium carbonate particles are filled in the hollow hemisphere, the mixing mass ratio of the ceramic particles to the calcium carbonate particles is 5-10:1, the calcium carbonate particles can generate chemical reaction after contacting with acid solution to generate carbon dioxide gas, the ceramic particles can absorb heat of the carbon dioxide on one hand and can improve the overall instability of the disturbance ball on the other hand, so that the disturbance effect is indirectly improved, the carbon dioxide after being cooled is heated after being released to form bubbles on the surface of polycrystalline silicon, and then the carbon dioxide is rapidly heated to expand and crack to cause resonance, so that the cracking of other bubbles is accelerated.
(8) The space that roof and disturbance bilayer membrane enclose is filled with the conduction oil, and in close contact with between the disturbance ball, and the heat on the disturbance ball both can be conducted away to the conduction oil, and the frictional resistance when also can reduce the disturbance ball action simultaneously makes things convenient for to float the migration above that to the conduction oil of liquid has certain transmission effect, can transmit on all the other each disturbance balls with the disturbance phenomenon of single disturbance ball, thereby improves holistic disturbance defoaming effect and homogeneity.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic structural view of an anti-vesicant of the present invention;
FIG. 3 is a schematic view of the structure of a perturbed bilayer membrane according to the present invention;
FIG. 4 is a schematic view of a position control lever according to the present invention;
fig. 5 is a schematic structural diagram of the disturbing ball of the present invention.
The reference numbers in the figures illustrate:
1 top plate, 2 disturbing double-layer films, 21 inner film, 22 outer film, 23 sealing sleeve, 24 water guide fiber, 3 position control rod, 31 magnet end, 32 extension rod, 33 pull rope end, 4 disturbing ball, 41 outer heat conducting sleeve, 42 magnetic hemisphere and 43 hollow hemisphere.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1-2, a defoaming texturing method for polysilicon used in photovoltaic includes the following steps:
s1, washing and cleaning the surface of the polycrystalline silicon wafer, drying and preheating to 20 ℃, and then dripping an acid solution to cover the surface of the polycrystalline silicon wafer;
s2, immediately covering the defoaming bag on the surface of the polycrystalline silicon wafer to extrude the acid solution and ensure that the acid solution does not leak from the edge;
s3, heating the polycrystalline silicon wafer in water bath, heating to 30 ℃, and keeping the temperature constant, wherein the texturing time is 50S;
s4, interfering and breaking the generated bubbles by the defoaming chamber in real time in the texturing process, and avoiding the bubbles from gathering to form large bubbles;
and S5, washing with water for 2 times after the wool making is finished to remove the residual acid solution, and then drying and packaging.
The acid solution in step S1 is prepared by mixing 45% by mass of nitric acid, 40% by mass of hydrofluoric acid, and the balance of pure water.
Referring to fig. 2, the defoaming bag in step S2 includes a top plate 1, a disturbance double-layer film 2, a plurality of position control rods 3 and a plurality of disturbance balls 4, the disturbance double-layer film 2 is connected to the lower end of the top plate 1 to form a hollow bag-shaped structure, the disturbance balls 4 are uniformly connected to the inner surface of the disturbance double-layer film 2, the position control rods 3 are connected between the top plate 1 and the disturbance balls 4, and the disturbance balls 4 absorb trace acid solution to generate gas, so that the disturbance of the disturbance double-layer film 2 to the acid solution is caused to achieve a good defoaming effect, and the positioning effect of the position control rods 3 to the disturbance balls 4 is utilized to indirectly improve the uniformity of flocking.
Referring to fig. 3, the disturbance double-layer membrane 2 includes an inner membrane 21, an outer membrane 22 and a plurality of sealing sleeves 23, the inner membrane 21 is connected to the inner side of the outer membrane 22, the sealing sleeves 23 are uniformly embedded between the inner membrane 21 and the outer membrane 22, and the sealing sleeves 23 are only connected with the inner membrane 21, a plurality of air vents corresponding to the sealing sleeves 23 are formed in the outer membrane 22, the disturbance balls 4 are embedded in the inner membrane 21 and are communicated with a space formed by the inner membrane 21 and the outer membrane 22, under the action of self gravity and the extrusion action of the disturbance balls 4 in a normal state, the sealing sleeves 23 can seal the air vents in the outer membrane 22, when gas generated by the disturbance balls 4 enters between the inner membrane 21 and the outer membrane 22 for inflation and expansion, the sealing sleeves 23 are driven to be separated from the air vents by utilizing the distance between the inner membrane 21 and the outer membrane 22, and then the gas is released out, so that double disturbance of the outer membrane 22 and the gas is formed, and the effect is better.
The double-layer membrane 2 of disturbance is still including many evenly distributed's water guide fiber 24, and water guide fiber 24 inlays and connects on intima 21 and adventitia 22, water guide fiber 24 both ends extend to the outside of 4 inboards of disturbance ball and adventitia 22 respectively, water guide fiber 24 can carry micro-acid solution to 4 departments of disturbance ball on the one hand, supply the 4 absorption of disturbance ball to produce gas, on the other hand can promote the defoaming effect through water guide fiber 24 when the disturbance of adventitia 22, and can stretch into and carry out the disturbance in the hole that has formed.
Referring to fig. 4, the position control rod 3 includes a magnet end 31, an extension rod 32 and a pull rope end 33 which are connected in sequence, the magnet end 31 is connected with the top plate 1, the pull rope end 33 is connected with the disturbance ball 4, and the repulsion action of the magnet end 31 on the disturbance ball 4 is utilized, so that on one hand, the pressing effect on the sealing sleeve 23 is improved, on the other hand, the repulsion force is relatively unstable, the disturbance of the disturbance ball 4 during action can be improved, the extension rod 32 plays a role in connection and extension, gas release failure caused by overlarge repulsion force is avoided, the pull rope end 33 allows the disturbance ball 4 to perform slight action, and the amplitude is controlled to be accelerated by frequency.
The magnet end 31 and the disturbing ball 4 keep magnetic repulsion, the extension rod 32 is made of hard materials, and the pull rope end 33 is made of flexible materials.
Referring to fig. 5, the disturbing ball 4 includes an outer heat conducting sleeve 41, a magnetic hemisphere 42 and a hollow hemisphere 43, the magnetic hemisphere 42 and the hollow hemisphere 43 are symmetrically connected, the magnetic hemisphere 42 and the hollow hemisphere 43 are both embedded and connected to the inner side of the outer heat conducting sleeve 41 to form a sphere, the magnetic hemisphere 42 is connected to the positioning control rod 3, one end of the hollow hemisphere 43, which is far away from the magnetic hemisphere 42, is provided with a gas port, the outer heat conducting sleeve 41 plays a role in weight reduction and heat conduction, the magnetic hemisphere 42 is used for being matched with the magnet end 31, and the hollow hemisphere 43 is used for absorbing acid solution to generate gas-triggered defoaming action.
The outer heat conduction sleeve 41 is made of light heat conduction materials, ceramic particles and calcium carbonate particles are filled in the hollow hemisphere 43, the mixing mass ratio of the ceramic particles to the calcium carbonate particles is 5-10:1, the calcium carbonate particles can generate chemical reaction after contacting with acid solution to generate carbon dioxide gas, the ceramic particles can absorb heat of the carbon dioxide on one hand and can improve the integral instability of the disturbance ball 4 on the other hand, so that the disturbance effect is indirectly improved, the cooled carbon dioxide is heated after being released to form bubbles on the surface of polycrystalline silicon, and then the bubbles are rapidly heated to expand and break to cause resonance, so that the breakage of other bubbles is accelerated.
The space intussuseption that roof 1 and disturbance bilayer membrane 2 enclose is filled with the conduction oil, and in close contact with between the disturbance ball 4, the heat conduction oil both can conduct away the heat on the disturbance ball 4, frictional resistance when also can reducing the action of disturbance ball 4 simultaneously, conveniently floats the migration on it to the conduction oil of liquid has certain transmission effect, can transmit on all the other each disturbance balls 4 with the disturbance phenomenon of single disturbance ball 4, thereby improve holistic disturbance defoaming effect and homogeneity.
Example 2:
a defoaming texturing method for photovoltaic polycrystalline silicon comprises the following steps:
s1, washing and cleaning the surface of the polycrystalline silicon wafer, drying and preheating to 20 ℃, and then dripping an acid solution to cover the surface of the polycrystalline silicon wafer;
s2, immediately covering the defoaming bag on the surface of the polycrystalline silicon wafer to extrude the acid solution and ensure that the acid solution does not leak from the edge;
s3, heating the polycrystalline silicon wafer in water bath, heating to 40 ℃, and keeping the temperature constant, wherein the texturing time is 60S;
s4, interfering and breaking the generated bubbles by the defoaming chamber in real time in the texturing process, and avoiding the bubbles from gathering to form large bubbles;
and S5, washing with water for 3 times after the wool making is finished to wash away the residual acid solution, and then drying and packaging.
The acid solution in step S1 is prepared by mixing 50% by mass of nitric acid, 35% by mass of hydrofluoric acid, and the balance of pure water.
The remainder was in accordance with example 1.
Example 2:
a defoaming texturing method for photovoltaic polycrystalline silicon comprises the following steps:
s1, washing and cleaning the surface of the polycrystalline silicon wafer, drying and preheating to 20 ℃, and then dripping an acid solution to cover the surface of the polycrystalline silicon wafer;
s2, immediately covering the defoaming bag on the surface of the polycrystalline silicon wafer to extrude the acid solution and ensure that the acid solution does not leak from the edge;
s3, heating the polycrystalline silicon wafer in water bath, heating to 50 ℃, and keeping the temperature constant, wherein the texturing time is 70S;
s4, interfering and breaking the generated bubbles by the defoaming chamber in real time in the texturing process, and avoiding the bubbles from gathering to form large bubbles;
and S5, washing with water for 5 times after the wool making is finished to wash away the residual acid solution, and then drying and packaging.
The acid solution in step S1 is prepared by mixing 55% by mass of nitric acid, 30% by mass of hydrofluoric acid, and the balance of pure water.
The remainder was in accordance with example 1.
It is worth noting that the materials adopted by the defoaming bag are all acid-resistant materials, so as to avoid corrosion by acid solution.
According to the invention, the traditional acid-soluble texturing mode is changed, the isolated environment is formed by attaching the defoaming bag, sufficient texturing is carried out, the volatilization of acid components is avoided, chemical reaction is synchronously carried out in a micro-absorption mode in the texturing process, so that generated gas causes the disturbance of the defoaming bag, on one hand, the disturbance is utilized to accelerate the rupture of bubbles on the surface of polycrystalline silicon, the accumulation phenomenon is not easy to occur, and simultaneously, the instability of the generated gas forming bubbles simultaneously is utilized to cause the resonance rupture of other bubbles, so that the defoaming result is obviously improved, on the other hand, the extrusion of the defoaming bag on an acid solution in the disturbance process is utilized, so that the corrosion effect of the defoaming bag on the polycrystalline silicon is improved.
The above are merely preferred embodiments of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. A defoaming texturing method for photovoltaic polycrystalline silicon is characterized by comprising the following steps: the method comprises the following steps:
s1, washing and cleaning the surface of the polycrystalline silicon wafer, drying and preheating to 20 ℃, and then dripping an acid solution to cover the surface of the polycrystalline silicon wafer;
s2, immediately covering the defoaming bag on the surface of the polycrystalline silicon wafer to extrude the acid solution and ensure that the acid solution does not leak from the edge;
s3, heating the polycrystalline silicon wafer in water bath, heating to 30-50 ℃, and keeping the temperature constant, wherein the texturing time is 50-70S;
s4, interfering and breaking the generated bubbles by the defoaming chamber in real time in the texturing process, and avoiding the bubbles from gathering to form large bubbles;
and S5, washing with water for 2-5 times after the wool making is finished to remove the residual acid solution, and then drying and packaging.
2. The defoaming texturing method for photovoltaic polysilicon according to claim 1, comprising the following steps: the acid solution in the step S1 is prepared by mixing 40-55% of nitric acid, 30-45% of hydrofluoric acid and the balance of pure water by mass fraction.
3. The defoaming texturing method for photovoltaic polysilicon according to claim 1, comprising the following steps: the defoaming bag in the step S2 comprises a top plate (1), a disturbance double-layer film (2), a plurality of position control rods (3) and a plurality of disturbance balls (4), wherein the disturbance double-layer film (2) is connected to the lower end of the top plate (1) to form a hollow bag-shaped structure, the disturbance balls (4) are uniformly connected to the inner surface of the disturbance double-layer film (2), and the position control rods (3) are connected between the top plate (1) and the disturbance balls (4).
4. The defoaming texturing method for photovoltaic polysilicon according to claim 3, wherein: disturbance double-layer membrane (2) include interior membrane (21), adventitia (22) and a plurality of seal cover (23), interior membrane (21) are connected in the inboard of adventitia (22), seal cover (23) are evenly inlayed between interior membrane (21) and adventitia (22), and seal cover (23) are only connected with interior membrane (21), set up a plurality of bleeder vents corresponding with seal cover (23) on adventitia (22), disturbance ball (4) are inlayed on interior membrane (21) and are linked together with the space that interior membrane (21) and adventitia (22) formed.
5. The defoaming texturing method for photovoltaic polysilicon according to claim 4, wherein: the double-layer disturbing membrane (2) is characterized by further comprising a plurality of uniformly distributed water guide fibers (24), the water guide fibers (24) are embedded and connected to the inner membrane (21) and the outer membrane (22), and two ends of each water guide fiber (24) extend to the inner side of the disturbing ball (4) and the outer side of the outer membrane (22) respectively.
6. The defoaming texturing method for photovoltaic polysilicon according to claim 3, wherein: accuse position pole (3) are including magnet end (31), extension rod (32) and stay cord end (33) that connect gradually, magnet end (31) are connected with roof (1), stay cord end (33) are connected with disturbance ball (4).
7. The defoaming texturing method for photovoltaic polysilicon according to claim 6, wherein: the magnet end (31) and the disturbance ball (4) keep a magnetic repulsion effect, the extension rod (32) is made of a hard material, and the pull rope end (33) is made of a flexible material.
8. The defoaming texturing method for photovoltaic polysilicon according to claim 3, wherein: disturbance ball (4) are including outer heat conduction cover (41), magnetism hemisphere (42) and hollow hemisphere (43) symmetric connection, and magnetism hemisphere (42) and hollow hemisphere (43) all inlay and connect in outer heat conduction cover (41) inboard and constitute the spheroid, magnetism hemisphere (42) are connected with position control pole (3), magnetic hemisphere (42) one end is kept away from in hollow hemisphere (43) has seted up the gas port.
9. The defoaming texturing method for photovoltaic polysilicon according to claim 8, wherein: the outer heat conduction sleeve (41) is made of light heat conduction materials, the hollow hemisphere (43) is filled with ceramic particles and calcium carbonate particles, and the mixing mass ratio of the ceramic particles to the calcium carbonate particles is 5-10: 1.
10. The defoaming texturing method for photovoltaic polysilicon according to claim 3, wherein: and heat conduction oil is filled in a space enclosed by the top plate (1) and the disturbance double-layer film (2), and the disturbance balls (4) are in close contact with each other.
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