157 results about "Solar cell fabrication" patented technology

The invention provides a preparation method of a back contact solar cell. The preparation method comprises the following steps: equally cutting a diffused and etched cell into at least two fragments; performing surface texturing on the cut fragments; performing a passivation process on the back surface and the front surface of the fragment, and forming passivation layers on the back surface, the front surface and the cutting surface of the fragment in the passivation process; patterning the fragments on which the passivation layers are formed so as to define alternative P-type regions and N-type regions on the back surfaces of the fragments; and preparing metalized electrodes corresponding to the P-type region and the N-type region on the back surface of the fragment. The problems that in the prior art, the efficiency loss is large, the repairing cost is high, and the whole piece is scrapped due to local defects caused by battery piece cutting can be solved.

The invention discloses metallized silver paste for improving sintering dusting of a TOPCon battery, a preparation method and application, and belongs to the technical field of solar battery manufacturing, and the technical scheme is that the metallized silver paste comprises the following components in percentage by mass: 72-87% of a metal phase; 3-9% of a glass phase; 8-12% of an organic carrier; 0.1%-0.5% of a polyimide precursor; 0.1 to 0.5 percent of cerium oxide; wherein the polyimide precursor forms a cross-linked network at a high temperature, the cerium oxide is used as a passivation layer protective agent, and lithium borosilicate glass is also added into the glass phase; according to the metalized silver paste for improving the sintering dusting of the TOPCon cell, the preparation method and the application, the dusting rate is reduced by improving and optimizing materials and process parameters, and compared with a traditional process, the efficiency, the photoelectric conversion efficiency and the yield of the solar cell are further improved.

The invention relates to a preparation method of a solar cell, the solar cell and a photovoltaic module, and belongs to the field of photovoltaic technology, and the preparation method of the solar cell comprises the steps: providing a substrate, the first surface of the substrate is provided with a pyramid structure, a doped conductive region is formed on the first surface, and a silica glass layer is formed on the side, away from the first surface, of the doped conductive region; laser processing is carried out on the first area part of the first surface, so that a low-concentration doped area is formed in the substrate, meanwhile, at least part of the silica glass layer located at the spire part of the pyramid structure in the first area is broken to form a notch, wet etching is carried out on the first surface side, and the notch can accelerate the rate of subsequent etching of the surface film layer of the first area; therefore, the efficiency of preparing the solar cell is improved.

The invention relates to the technical field of solar cells, and particularly discloses conductive paste for a solar cell, a preparation method of the conductive paste and an electrode. The conductive paste for the solar cell comprises the following components in percentage by weight: 88%-92% of carbon-based nano-copper particles, 4%-6% of glass powder and 4%-6% of an organic additive, the carbon-based nano-copper particles are prepared by reacting copper chloride with glucose and then calcining, the particle size is 52-100nm, and copper oxidation is inhibited by using a carbon layer; the organic additive is composed of a stabilizer, resin and an organic solvent according to a ratio of 1: 3: 9. The conductive material is prepared by mixing, dispersing, grinding and filtering, and can be prepared into a solar cell conductive material by silk-screen printing and high-temperature sintering. The conductive paste is low in cost, high in oxidation resistance and excellent in conductivity, and can replace silver paste to reduce the manufacturing cost of the solar cell, improve the performance and prolong the service life.

The invention relates to the field of solar cell manufacturing, and particularly discloses a polishing additive for solving the black core problem in the BC cell pre-rough polishing process and a use method of the polishing additive. 0.1-5% of a defoaming agent; 0.1 to 0.5 percent of pH (Potential of Hydrogen) regulator; and the balance of deionized water. According to the method, the accelerant, the defoaming agent and the pH regulator in a specific ratio are combined, so that the oxidation reaction on the surface of the silicon wafer is more uniform and controllable; the accelerant accelerates formation and dissolution of a surface oxide layer, and generation of black cores is effectively avoided; the synergistic effect of the defoaming agent ensures that bubbles generated by the reaction can be quickly desorbed, the problem of uneven local corrosion caused by bubble retention is prevented, the surface of the polished silicon wafer is completely free of black nuclei, and ideal surface conditions are provided for subsequent processes.

The invention belongs to the technical field of solar cell manufacturing, and provides a step temperature cycle propulsion boron diffusion process and application thereof. The boron diffusion technology comprises the steps that a silicon wafer is placed in boron diffusion equipment, pre-oxidation, pre-deposition and stepped temperature circulation boron diffusion propelling are sequentially carried out on the silicon wafer, and the stepped temperature circulation boron diffusion propelling procedure comprises an initial stage, a middle stage and a final stage which are sequentially carried out. A circulation mode of heating oxygen-free boron expansion and pushing junction and then cooling oxygen-filled boron expansion and pushing junction is adopted in each stage for multiple times of circulation, and the heating temperature and the cooling temperature of each stage are optimized, so that a boron expansion doping layer is formed on the surface of the silicon wafer. According to the boron diffusion process, the oxidation temperature can be reduced, the concentric circle defect can be eliminated, the junction depth and the surface doping concentration of boron diffusion doping can be increased, the uniformity of boron diffusion doping can be improved, the FF, Jsc, Uoc and Eta of the battery can be further improved, the thermal budget can be reduced, and the service life of equipment can be prolonged.

The utility model discloses a back-junction double-sided passivated solar cell, which relates to the technical field of solar cell manufacturing and comprises a silicon substrate, a back-junction double-sided passivated solar cell and a back-junction double-sided passivated solar cell, metal areas with micro-textured structures and non-metal areas with textured structures are alternately arranged on one side of the silicon substrate in the thickness direction; the suede structure and the micro suede structure are different in tower footing size; a first tunneling oxide layer and a first doping layer doped with a first doping element are stacked on the metal region from inside to outside; according to the embodiment, the metal areas with the micro-textured structures and the non-metal areas with the textured structures are alternately arranged on one side of the thickness direction of the silicon substrate, so that the non-metal areas can be ensured to be the textured structures without front fields, the passivation effect is reserved and optimized to the greatest extent, and the transverse transmission of charges is not influenced. And meanwhile, the first tunneling oxide layer and the first doping layer are arranged on the micro suede structure of the metal region, so that enough tensile stress can be provided on the basis of not influencing passivation and contact performance.

The invention relates to the technical field of solar cell manufacturing, provides a pyramid suede structure suitable for a perovskite crystalline silicon laminated cell and a preparation method of the pyramid suede structure, and solves the problems that an existing suede structure is low in light capture efficiency and poor in surface morphology consistency. The method comprises the following steps: selecting a (100) crystal orientation monocrystalline silicon wafer for cleaning treatment; preparing a down solution from a plurality of components including boron-containing ammonium hydroxide, sodium hydroxide, sodium silicate, isopropanol, polyethylene glycol, sodium citrate and the like; uniform nucleation points are formed through chemical pre-etching and beta-cyclodextrin surface modification; wherein the boron-containing ammonium hydroxide is prepared by reacting boric acid with ammonia gas under an alkaline condition. The prepared pyramid suede structure is composed of tetrahedral pyramid units which are regularly arranged. The method is stable in process and good in reproducibility, and the prepared textured structure has excellent light capture efficiency and surface consistency and is suitable for manufacturing efficient perovskite crystalline silicon laminated cells.

The invention discloses a T0PCon solar cell edge coating passivation treatment device and process, relates to the technical field of solar cell manufacturing, aims to solve the technical problem of poor side passivation effect after solar cells are cut by adopting ALD in a solar cell stacking mode, and comprises a reaction tank body, a base, a stacking mechanism and a functional mechanism. The solar cell is placed in the gap between the two partition plates, passivation gas is isolated through the sealing gaskets A, so that the surface of the solar cell is protected, the protection gas cavity is defined by the gas grooves, the two corresponding sealing gaskets A and the surface of the solar cell, and protection gas is introduced into the protection gas cavity, so that the surface of the solar cell is protected. The surface of the solar cell is further protected by the air curtain isolation layer in the protection air cavity, passivation gas is limited in the cutting area through protection, the extrusion contact requirement of the sealing gasket A and the solar cell is reduced through the air curtain isolation layer, and therefore damage to the solar cell is reduced.

The invention discloses a silicon wafer pyramid suede modification method and a solar cell, and belongs to the technical field of solar cell manufacturing. The silicon wafer pyramid suede modification method comprises the following steps: pretreatment; in the first step of texturing, a silicon wafer is placed in an alkaline solution containing an additive A, and a basic pyramid textured surface is formed through reaction; washing with water; second-step modification: placing the silicon wafer in an alkaline solution containing an additive B, and reacting to form a tower body step structure and a nano pit; carrying out post-treatment; the additive A and the additive B are heterologous additives of different chemical systems; the temperature of the first-step texturing is higher than that of the second-step modification. According to the method, the high-density basic pyramid suede is firstly constructed, then directional etching is performed on the tower body, and the stepped laminated surface and the surface nano pit array are synchronously formed, so that the comprehensive performance of the solar cell can be improved.

This utility model discloses a silicon substrate, a solar cell, and a photovoltaic module, relating to the field of solar cell technology, to solve the problem that after initial silicon wafers are treated with laser thermal cracking, excessive edge stress leads to a high breakage rate and significant performance degradation during subsequent solar cell fabrication. The silicon substrate includes a first surface and a second surface opposite to each other, and a plurality of side surfaces connecting the first and second surfaces; the side surfaces include a first side surface, wherein at least a portion of the first side surface has a first protrusion, one end of the first protrusion being close to the first surface, and the other end of the first protrusion being close to the second surface; along the direction from the first surface to the second surface, the distance between any point on the first protrusion and the first side surface first increases and then decreases.

The invention relates to the field of solar cell manufacturing, in particular to a half-cell section laser passivation method for preventing winding plating and application, and the method comprises the following steps: (a) placing a cut half-cell into a processing chamber with the section facing upwards; (b) emitting laser to the tangent plane at a non-vertical incidence angle, so that the laser only covers the exposed area of the tangent plane; (c) introducing oxygen-containing gas and water vapor, and decomposing section pollutants by laser excitation; and (d) alternately introducing an aluminum source gas and an oxidizing gas, simultaneously irradiating the section with laser, and selectively depositing an aluminum oxide layer on the section. According to the method, aluminum oxide normally grows at the section position and aluminum oxide deposition is almost not carried out at the non-section position in a mode that the extremely-low flow source is matched with the laser to enhance the section deposition rate, so that the generation of winding plating at the front and back side edges is reduced, and the appearance and poor welding are reduced.

The invention discloses a solar cell and a photovoltaic module, and relates to the field of photovoltaic technology. The solar cell comprises a semiconductor substrate, the first surface of the semiconductor substrate is provided with a first semiconductor layer, the first semiconductor layer is provided with isolation regions, and the isolation regions are arranged at intervals in the first direction and extend in the second direction; the passivation layer at least covers one side, deviating from the semiconductor substrate, of the first semiconductor layer and the isolation region; the passivation layer is provided with a plurality of groups of first holes; at least part of the first grid lines are electrically connected with the first semiconductor layer through a group of first holes, and the first grid lines are formed by base metal slurry; in the first direction, the distance between the hole edge close to the first edge and the hole edge close to the second edge in the first open holes in the same group is W1, the width of the first semiconductor layer is W2, the width of the first grid line is W3, W2 / W3 is larger than or equal to 2 and smaller than or equal to 50, and W3 / W1 is larger than or equal to 1.2 and smaller than or equal to 4.5. The light absorption and utilization rate is improved while the manufacturing cost of the solar cell is reduced.

The present invention relates to a texturing liquid for a single crystal PERC cell and a texturing method thereof, and belongs to the technical field of solar cell manufacturing. The texturing liquid includes a first texturing liquid and a second texturing liquid; the first texturing liquid is composed of the following raw materials in weight percentage: 1%-2.5% of a KOH solution with a concentration of 45%, 0.3%-0.7% of a texturing additive, and the rest is deionized water; the texturing additive is composed of the following raw materials in weight percentage: deionized water, a texturing etchant, a complexing agent, molasses after clarification, a surfactant, and a defoaming agent; the second texturing liquid is composed of the following raw materials in weight percentage: 0.05%-0.1% of a KOH solution with a concentration of 45%, and the rest is deionized water. After texturing by the present invention, the conversion efficiency of the cell is improved, a small and uniform texturing surface is formed on the surface of the single crystal PERC cell, the reflectivity of the texturing surface is reduced, the use of chemicals is reduced, and costs are saved.

To provide a mask for film formation, achieving an improvement in pattern deposition accuracy.SOLUTION: A mask 100 for film formation includes: a pattern opening 110 having a strip-shaped bus bar opening 110b corresponding to a bus bar part at a comb-shaped pattern and a plurality of strip-shaped finger openings 110f corresponding to a plurality of finger parts at the pattern, respectively; a frame part 120 that surrounds the pattern opening 110 and that comprises a first frame side part and a second frame side part sandwiching the pattern opening 110 therebetween and a third frame side part and a fourth frame side part sandwiching the pattern opening 110 therebetween; a plurality of strip-shaped finger mask parts 130 which are each arranged between the finger openings 110f adjacent to each other and extend from the third frame side part toward the respective bus bar openings; and a joint part 140 which, in a part of the pattern opening 110, joints each of the finger mask parts 130 to at least one of the frame part 120 and the adjacent finger mask part 130.SELECTED DRAWING: Figure 4A

This application provides a method for fabricating a solar cell and a solar cell. The method includes: forming a composite sacrificial layer on the surface of a solar cell substrate; forming an ink mask on the side of the composite sacrificial layer facing away from the solar cell substrate, the ink mask comprising microcapsules, each microcapsule comprising a wall and a core, the wall material comprising polylactic acid-glycolic acid copolymer, and the core material comprising sodium bicarbonate; patterning the ink mask and composite sacrificial layer using a laser processing technique to form a target pattern matching grid lines, thereby exposing a portion of the solar cell substrate; the composite sacrificial layer serving to buffer stress generated by the laser and absorb laser light during subsequent fabrication; forming grid lines on the exposed solar cell substrate; and removing the ink mask and composite sacrificial layer. This application solves the problem of poor quality solar cells obtained by existing solar cell fabrication methods.

The invention, which relates to a liquid-carrying roller for wet etching and a wet etching method, belongs to the technical field of solar cell manufacturing, and solves the problem of abnormal roller levelness in a process of manufacturing a solar cell in the prior art. The liquid-carrying roller for wet etching of the invention comprises a first end shaft, a second end shaft, and a liquid-carrying shaft, the first end shaft and the second end shaft being located at both ends of the liquid-carrying shaft, respectively, the first end shaft, the second end shaft and the liquid-carrying shaft being arranged concentrically, and the diameters of the first end shaft and the second end shaft being both adjustable.

A solar cell manufacturing apparatus according to an embodiment of the present invention comprises: a plurality of stages which are arranged in a row and are in contact with each other, and on which solar cells are mounted; a base unit for supporting the plurality of stages and transferring the plurality of stages to the curing zone; a transfer unit for transferring the plurality of stages to a curing zone; a transfer unit for transferring the plurality of stages to a curing zone; and a pin supply unit disposed on one side of the base unit and supplying a pin between predetermined adjacent two stages among the plurality of stages, in which the two stages coupled to the pin supplied by the pin supply unit are spaced apart from each other.

The present invention provides a method for manufacturing a solar cell, comprising: a step of first patterning the periphery of one surface of a substrate so as to form a groove; a step of forming a thin film layer on one surface or the other surface of the substrate; and a step of cutting the periphery of the substrate along the groove.

The invention discloses a monocrystalline silicon surface secondary texturing process for solar cell manufacturing, and belongs to the technical field of solar cell manufacturing. According to the process, a two-step method of'primary texturing and secondary texturing 'is adopted, and after a pyramid-shaped basic structure is formed through primary texturing, a texturing solution with a specific formula is adopted for secondary modification. The primary texturing parameters are as follows: treatment is performed for 280 seconds in a solution containing 685 L of a DI aqueous solution, 8.5 L of a NaOH solution and 2.2 L of an ADD2 solution at 65 DEG C; the secondary texturing parameters are as follows: at 82 DEG C, treatment is carried out for 420 seconds in a solution containing 690L of a DI aqueous solution, 0.7 L of a NaOH solution and 12,000 ml of HDI, the initial alkali preparation amount is 1 L more than that of a conventional process, and the total time is shortened by 40 seconds. Experiments show that the technology enables the reflectivity of the silicon wafer to be reduced by 0.5%-0.8%, the photoelectric conversion efficiency of the cell to be improved by 0.045%, the current to be obviously improved, and the technology is suitable for efficient solar cell production.

The application relates to the field of solar cell manufacturing, and particularly discloses a TOPCon cell and a preparation method thereof. A front surface oxidation layer is obtained by front surface oxidation of a silicon substrate; a back surface oxidation layer and a polysilicon layer are sequentially arranged on the back surface of the silicon substrate; a SE area of the front surface oxidation layer is laser grooved to obtain a diffusion precursor, grooves on the front surface of the diffusion precursor penetrate the front surface oxidation layer; boron diffusion is performed on the front surface of the diffusion precursor to obtain a cell precursor; after back surface phosphorus diffusion, surface passivation and electrode arrangement are performed on the cell precursor, the TOPCon cell is obtained. The TOPCon cell is produced by only one diffusion, so that the process flow is simplified, the service life of a reaction furnace is greatly prolonged, the demand for boron diffusion reagents in the production process is reduced, and the production cost is greatly reduced.

Embodiments of the present invention provide a silicon wafer conveying device and method, relating to the field of solar cell manufacturing. The silicon wafer conveying device includes a support, a porous medium, and an air flotation plate. The support is provided with a vent hole for connecting to an external first air source. The porous medium is disposed on the support and below the silicon wafer. The pores of the porous medium are used to output a positive pressure airflow, thereby forming an air film on the surface of the porous medium. The air flotation plate and the support are disposed adjacent to each other. The air flotation plate is provided with airflow guide grooves. The porous medium supplies air from below the silicon wafer. The airflow enters the cavities of the porous medium through the vent hole, forming an air film on the surface of the porous medium to suspend the silicon wafer. The airflow guide grooves of the air flotation plate can guide the airflow direction to align with the transport direction of the silicon wafer, thereby improving the transport stability of the silicon wafer, avoiding affecting the quality of the silicon wafer, and improving production efficiency.

The invention discloses a preparation method of a solar cell and the solar cell, and relates to the technical field of solar cell manufacturing, and the method comprises the steps: providing a silicon substrate, and enabling a first main surface of the silicon substrate to comprise a first region, a second region and a spacer region; sequentially preparing a first tunneling passivation layer, a transition element doping layer and an insulating isolation layer in the first region and the spacer region from inside to outside; the transition element doped layer comprises an intrinsic polycrystalline silicon layer and a first doped polycrystalline silicon layer doped with a first doped element which are arranged in a stacked manner; preparing a carrier collection layer doped with a second doping element in the second region and the outer side of the insulating isolation layer; respectively removing the parts, corresponding to the first region, in the carrier collection layer and the insulated isolation layer by using a first laser process, and obtaining a first carrier transmission layer corresponding to the first region by using the energy of the laser process; according to the embodiment, the problem of electric leakage of the spacer region is solved while a high-temperature annealing process is reduced.

The utility model relates to a slow lifting device, a texturing system and a solar cell manufacturing production line. The slow lifting device comprises a slow lifting assembly, the slow lifting assembly comprises a slow lifting main body and a slow lifting auxiliary body, the slow lifting main body is provided with a slow lifting main groove, the slow lifting auxiliary body is provided with a slow lifting auxiliary groove, and the slow lifting main groove is communicated with the slow lifting auxiliary groove; the preheating pipe assembly is installed on the slow lifting accessory body, at least part of the preheating pipe assembly is located in the slow lifting auxiliary groove, the preheating pipe assembly is communicated between the cold water source and the water inlet end of the water heater, and the water outlet end of the water heater is communicated with the slow lifting main groove. According to the slow lifting device, the texturing system and the solar cell manufacturing production line provided by the invention, the energy consumption can be reduced.

The utility model discloses a back contact solar cell, and relates to the technical field of solar cell manufacturing. Comprising a silicon substrate, first carrier collecting layers and second carrier collecting layers which are alternately arranged on a first main surface of the silicon substrate, first insulating layers which are located on the outer sides of the second carrier collecting layers and are arranged close to the first carrier collecting layers at intervals, and second insulating layers arranged on the outer sides of the first insulating layers, wherein the type of the first current carrier collection layer is opposite to that of the second current carrier collection layer, and no electric connection exists between the first current carrier collection layer and the second current carrier collection layer; an electrode groove is formed between every two adjacent first insulating layers, and each electrode groove corresponds to the first carrier collection layer or the second carrier collection layer; a metal electrode stacked on the outer side of the first carrier collection layer or the second carrier collection layer is further arranged in the electrode groove, and the second insulation layer is located on the outer side of the metal electrode. According to the embodiment, the appearance beautification degree of the solar cell is improved while the metal electrode is protected.

The invention discloses a method suitable for annealing and efficiency improvement of an N-type Topcon battery piece, and relates to the field of solar battery manufacturing. The method is based on an existing 10-step annealing process, and the core is that nitrogen and oxygen are synchronously introduced during crystallization temperature rise and high-temperature crystallization to generate a silicon dioxide layer. The crystallization heating parameters are as follows: the temperature is 900 to 910 DEG C, the pressure is 800 to 900 mbar, the time is 400 to 500 seconds, the nitrogen content is 4500 to 5500 sccm, and the oxygen content is 800 to 1200 sccm; the high-temperature crystallization parameters are 900-910 DEG C, 800-900 mbar and 2000-2800 seconds, the nitrogen content is 5500-6500 sccm, the oxygen content is 800-1200 sccm, the optimal parameters are that the temperature is 903 DEG C and the like, the silicon dioxide layer can isolate impurities, prevent oxidation and absorb harmful ions, and the ions are removed through subsequent wet cleaning. Experiments prove that the battery efficiency is improved by 0.043%-0.062%, the open-circuit voltage and the short-circuit current are improved, the cost is low, and implementation is easy.

The present invention provides solar cells, methods for manufacturing the same, stacked cells, and photovoltaic power generation assemblies. [Solution] The solar cell includes a cell substrate having a first surface and a second surface facing away from each other, and a plurality of grid lines located on the first surface and / or the second surface and arranged at intervals in the first direction, which are electrically connected to the cell substrate and include a contact structure and a connecting layer, wherein the contact structure includes a plurality of contact portions, and the connecting layer is a long structure extending in the second direction, wherein the contact portions include first contact portions and second contact portions arranged alternately in the second direction, and the connecting layer has first side portions and second side portions facing away from each other in the first direction, wherein the first contact portions are connected in contact with at least the first side portions and the second contact portions are connected in contact with the second side portions, or the second contact portions are connected in contact with at least the second side portions and the first contact portions are connected in contact with the first side portions.

A solar cell manufacturing apparatus according to an embodiment of the present invention comprises: a first base unit on which a stage on which a solar cell is mounted is disposed and conveyed; a second base unit which is disposed on a lower side of the first base unit and conveys the stage supplied from the first base unit; a first stage lifting unit connected to the other end of the first base unit and one end of the second base unit, and transferring a stage provided on the first base unit to the second base unit; a second stage lifting unit; and a second stage lifting unit connected to one end of the first base unit and the other end of the second base unit, and transferring a stage provided on the second base unit to the first base unit. The stage circulates on the first base unit and the second base unit.

The invention relates to a process for fabricating a solar cell. The process comprises depositing a layer of amorphous silicon on a substrate using physical vapour deposition, said substrate being a layer of a dielectric disposed on a silicon wafer. The amorphous silicon is then annealed so as to generate a layer of polycrystalline silicon on the substrate.

A solar cell manufacturing apparatus according to an embodiment of the present invention comprises: a base unit that conveys and supports a stage on which a solar cell is mounted; and a curing unit disposed on an upper portion of the base unit and formed to have a hollow portion having an open lower portion to cover a part of the upper portion of the base unit. The base unit includes a first heater disposed on the upper surface portion. The curing unit includes a second heater disposed on the inner top portion. A stage on which a solar cell is mounted is transferred between the first heater and the second heater, and a first length of the first heater may be longer than a second length of the second heater.