829results about How to "Increase short circuit current" patented technology

The invention discloses a laminated organic thin-film solar cell comprising a substrate, a transparent anode layer, an anode buffering layer, an organic photoelectric conversion layer 1, a connecting layer, an organic photoelectric conversion layer 2, a cathode buffering layer and a cathode layer, wherein the connecting layer can be formed by the following two methods: (1) an enhancement reflection film and a hole transporting layer are combined into the connecting layer; and (2) an enhancement reflection film, a metal thin layer and a hole transporting layer are combined into the connecting layer. The enhancement reflection film can improve the reflectivity of the connecting layer according to the specified range of wavelength. Simultaneously, the enhancement reflection film has better electronic transmission performance, guarantees electrons and holes to be effectively compounded on the connecting layer. The laminated organic thin-film solar cell prepared by the method is characterized by high energy conversion efficiency and good stability.

The invention discloses a solar cell with a composite dielectric passivation layer structure and a preparation process thereof. A silicon oxide film, an alumina film and a silicon nitride or silicon oxynitride film are deposited in turn on the front, back and sides of a p-type silicon substrate to form a composite dielectric film on the whole surface, and windows are opened locally to lead electrodes out. Through aluminum oxide, silicon dioxide, silicon oxynitride, silicon nitride with different refractive indexes and a back surface passivation layer with a laminated structure of the materials, the back surface recombination rate is greatly reduced, the back reflectivity is improved, the CTM of a module is reduced, and the light attenuation and heat-assisted light attenuation and the anti-PID performance of the cell are improved. The structure can be made on a boron/gallium-doped p-type monocrystalline silicon, p-type polycrystalline silicon or p-type monocrystalline-silicon-like substrate, and a passivation method based on the composite dielectric film passivation structure can be used to manufacture PERC cells, double-sided PERC+ cells and imbricate PERC cells. Based on the preparation process steps and sequence, the corresponding preparation mode and the process parameter range of the laminated structure, the making of the cell can be well completed.

The invention provides a method for preparing a perovskite solar cell on the basis of a two-dimensional material graphene-phase carbon nitride. The graphene-phase carbon nitride is doped into a perovskite precursor solution to prepare the perovskite solar cell. The method has the following advantages that (1) the raw material required for synthesis of the material is low in cost, and the product is small in toxicity; (2) solvent volatilization during the annealing process is effectively slowed down, so that a perovskite thin film crystal is more uniform and compact; (3) the grain crystal sizeof a perovskite layer is increased, a crystal boundary easy to combine with charge is effectively reduced, and the filling factor of a device is improved; (4) a surface of the perovskite thin film ispassivated, and the hysteresis phenomenon of the device is effectively improved; and (5) the conductivity of the surface of the perovskite thin film is improved, the contact resistance of the interface is reduced, and the short-circuit current of the device is increased. The preparation process is simple and convenient and is low in preparation difficulty; by doping of the graphene-phase carbon nitride, the smoothness and the uniformity of the perovskite thin film can be effectively improved; and by a series of gradient doping, the device performance is remarkably changed.

The invention discloses a Spiro-OMeTAD/PbS composite hole transport layer based perovskite solar cell and a preparation method therefor. The perovskite solar cell comprises a transparent conductive substrate, an oxide electron transport layer, a perovskite solar light absorption layer, the Spiro-OMeTAD/PbS composite hole transport layer and a metal electrode. The perovskite thin film solar cell adopts a simple process; a lead sulfide thin film can be prepared by a large-area evaporation method; and the lead sulfide thin film can be inserted between the Spiro-OMeTAD and the metal electrode layer to be used as a buffer layer. The Spiro-OMeTAD/PbS composite hole transport layer based perovskite solar cell achieves a high photoelectric conversion efficiency which is as high as 15.11%; the lead sulfide, which is used as the buffer layer between the hole transport layer and the metal electrode, has higher hole mobility, and higher humidity stability and light and heat stability, so that the recombination of electron-hole pairs can be reduced; meanwhile, the stability of the cell can be improved; compared with other buffer layer materials, the lead sulfide can protect a device and improve the performance of the device as well; and therefore, a positive promotion effect is realized on the industrial development of the solar cell.

The invention relates to a monocrystalline silicon solar cell and a preparation method thereof, in particular to a monocrystalline silicon solar cell with a buried charge layer introduced into a passivating dielectric layer, and belongs to the technical field of the preparation of solar cell devices. The monocrystalline silicon solar cell is developed based on the preparation scheme of the general monocrystalline silicon solar cell and adopts a structure of partial back contact, and the preparation method is characterized by comprising the steps of: growing an SiO2 layer on the back of a solar cell by utilizing a thermal oxidation or atomic layer deposition technology, growing a layer of SiNx thin film by using PECVD (Plasma Enhanced Chemical Vapor Deposition), etching a back electrode contact area by using a laser grooving technology, then injecting electrons with a corona mode, and finally depositing an Al electrode with a vacuum evaporation mode. The invention can effectively improve the solar cell efficiency.

The invention relates to technology for manufacturing a selective emitter junction solar cell by a printed phosphorous source one-step diffusion method. The method comprises the following steps of: cleaning and texturing a silicon wafer, performing screen printing of phosphorous-containing nano Si slurry, drying at the temperature of between 200 and 350 DEG C for about 20 minutes, and removing the solvent to obtain a phosphorous-containing oxidation layer with the thickness of 30 to 100nm; implementing BOE and RCA cleaning to remove 70 percent of surface phosphorous slurry before diffusion; putting the silicon wafer into a diffusion furnace, adding a POCL3 air source, heating to between 800 and 1,000 DEG C, forming re-diffusion at a grid line of the phosphorous-containing nano slurry on the silicon wafer to form a higher surface concentration-heavily doped region, and forming a shallow diffusion region in other areas. By adopting the screen printing of the phosphorous-containing nano slurry, the phosphorous-containing nano slurry is heated at high temperature for diffusion, forms the heavily doped region at a contact position with the grid line and forms a lightly doped region in other areas. The technology has the efficiency of over 18.5 percent on the premise of better controlling the diffusion uniformity.

The invention discloses a method for manufacturing a silicon solar cell. In the process of manufacturing a PN junction on a silicon wafer, a selective diffusion technology method is adopted, i,e. laser is utilized to heat a position, on which a positive electrode intends to be manufactured, on the surface of the silicon wafer; and under the action of heating, phosphorus in a phosphorus source uniformly adhered on the surface diffuses towards the inner of the silicon wafer, thus a heavy doping zone with smaller sheet resistance is formed at the position on which the positive electrode intends to be manufactured to effectively reduce the sheet resistance of the silicon solar cell, thereby not only being beneficial for increasing the open-circuit voltage of the silicon solar cell; the increase of the open-circuit voltage effectively improves the conversion efficiency of the silicon solar cell, reduces ohmic contact of a metal electrode and the silicon solar cell, thereby reducing the series resistance of the silicon solar cell, and being capable of meeting the purpose of industrialized production better.

The invention discloses an organic/inorganic hybrid solar cell and a preparation method thereof. A ZnO nanorod array which is vertically grown on an ITO substrate is taken as a template, and a ZnO-CdS heterogeneous core shell structure nanorod array with a core of ZnO and a shell of CdS is prepared. Through compounding a polymer and the ZnO-CdS heterogeneous core shell structure nanorod array, a solar cell with an anode of ITO and a cathode of an Au film is prepared. When thickness of the CdS shell is about 6 nm, cell performance is best, open-circuit voltage reaches 0.89 V, short circuit current is 2.83 mA/cm<2>, and conversion efficiency reaches 0.74%. Compared with a pure ZnO nanorod array cell, open-circuit voltage of a ZnO-CdS array cell is raised by 170%, short circuit current of the ZnO-CdS array cell is increased by 146%, and conversion efficiency of the ZnO-CdS array cell is raised by 517%.

The invention provides an auxiliary chemical composition for monocrystalline silicon or polycrystalline silicon acidic wool making. The auxiliary chemical composition comprises 0.0001-75 weight% of surface catalysts and the balance of water. The auxiliary chemical composition has the advantages of simple preparation and application methods, easy implementation and good repeatability; when the auxiliary chemical composition is used for the monocrystalline silicon or polycrystalline silicon wool making, the wool making temperature can be increased, and the wool making effect is obviously improved; prepared silicon discs have the characteristics of low reflectivity, clean surfaces and low fragment rate; and the photoelectric conversion efficiency of silicon batteries can be largely improved.

The invention relates to a passivated contact N-type solar cell, a preparation method, an assembly and a system. The preparation method for a passivated contact N-type solar cell includes the steps of conducting doping treatment for the front surface of an N-type crystalline silicon substrate to form a p+ doped region; preparing a tunneling oxide layer on the back surface of the N-type crystalline silicon substrate, then preparing a phosphorus-containing amorphous silicon layer or phosphorus-containing polysilicon layer on the tunneling oxide layer, and then conducting annealing; and after preparation of passivated anti-reflection film and a passivated film, printing and sintering metal slurry to obtain a front electrode and a back electrode. The beneficial effects of the invention lie in that the tunneling oxide layer can provide the silicon substrate with an excellent surface passivated effect and achieve selective tunneling of carriers, the n+ doped polysilicon layer can effectively transmit the carriers for the metal electrode on the back surface to collect, the back metal electrode does not destroy the passivated layer on the surface of the crystalline silicon substrate, and thus thereby open-circuit voltage of the cell can be greatly increased.

The invention discloses a solar cell passivation antireflection film and a preparation technology and a method of the solar cell passivation antireflection film. The preparation technology and the method utilize a plasma enhanced chemical vapor deposition (PECVD), a layer of silicon dioxide film is deposited on the surface of a silicon slice, then a silicon nitride layer with high refractive index is deposited on the prepared silicon dioxide film, and finally a silicon nitride layer with low refractive index is deposited on the silicon nitride layer with high refractive index. The technology and the method have the advantages of being convenient to operate, low in operation cost, good in passivation and good in antireflection performance for the cell surface. The passivation antireflection film prepared by the technology can obviously improve the open circuit voltage, short circuit current and the cell efficiency of the solar cell, compared with a traditional single-layer or double-layer silicon nitride film.

The invention belongs to the technical field of solar cells and in particular relates to an organic solar cell based on a carbon nanotube fiber and a preparation method thereof. In the invention, a carbon nanotube fiber sensitized by N719 serves as a working electrode material, FTO conducting glass or a FTO-PEN conductive plastic serves as the substrate of the working electrode and a counter electrode and anhydrous acetonitrile solution of LiI, I2, dimethyl-3-N-propyl group imidazole iodine and butyl group pyridine serves as electrolyte. Short-circuit photocurrent of the solar cell reaches 10.3mA/cm<2>, the maximum monochromatic light photoelectric conversion efficiency is over 90% and energy conversion efficiency reaches 2.2%.In particular, a Pt/FTO conductive plastic is used for preparing a flexible bendable organic solar cell, the scope of available materials of the efficient solar cell is expanded and a novel approach is provided for manufacturing novel, efficient and practical photovoltaic devices.

The invention discloses a p-i-n type InGaN solar cell possessing a superlattice structure. The current p-i-n type InGaN solar cell possesses a problem of low conversion efficiency. The p-i-n type InGaN solar cell provided in the invention can solve the above problem. The solar cell comprises, from bottom to top: a substrate; an AlN nucleating layer (11), which is growth at a high temperature; an unintended doped GaN buffer layer (12); an n-GaN layer (13) possessing a thickness of 50-100nm and an electron concentration of 1x1018-6x1019/cm<3>; a InGaN/GaN superlattice structure (14) possessing a period of 8-30; a p-GaN layer (15) possessing the thickness of 50-100nm and a hole concentration of 1x1017-6x1018/ cm<3>. The thickness of a trap layer InGaN (18) of the InGaN/GaN superlattice is 8-16nm. In ingredients are 15%-90%. The thickness of a barrier layer GaN (19) is 3-8nm. The concentration of carriers is 1x1016-2x1017/ cm<3>. Grid-shaped Ni/Au ohmic electrodes (16) are distributed on the surface of a P-GaN layer (15). An Al/Au ohmic electrode (17) is led out from a right side of the surface of the n-GaN layer (13). By using the solar cell of the invention, a short circuit current of the cell can be raised. The solar cell possesses high conversion efficiency and can be used for solar photovoltaic power generation.

The invention discloses a preparation method of a three-dimensional dendritic TiO2 array with rapid electronic transmission performance. The preparation method comprises the steps as follows: 1), a one-dimensional nanometer TiO2 rod array with rapid electronic transmission performance is grown on the surface of a conductive substrate deposited with a TiO2 crystal seed layer with a hydrothermal method; 2), the one-dimensional nanometer TiO2 rod array obtained in the step 1) is subjected to surface treatment, and a three-dimensional dendritic structure is grown on a no-seed layer in an epitaxial manner with a water-bath method; and 3), an obtained sample with the three-dimensional dendritic structure is subjected to oxygen plasma cleaning and oxygen atmosphere sintering treatment, so that a three-dimensional dendritic TiO2 array nano-structure is obtained. According to the preparation method, the technological operation is simple, the cost is low, the controllability is high, grain boundaries and defects of the obtained TiO2 array are few, high electrical transmission rate and large specific surface area are provided, the TiO2 array can be used for a photo-anode of an photoelectric device, the device performance is improved greatly, and a good application prospect is provided.

The invention provides a corrosive liquid for making the texture surface of monocrystalline silicon. The corrosive liquid comprises the following components based on mass concentration: 0.1 to 0.5 percent of NaOH and/or KOH, 5 to 8 percent of isopropyl alcohol and/or ethanol, 0.3 to 0.5 percent of sodium lactate, 1 to 2 percent of urea and the balance of water; and the sodium lactate and the urea are selected as additives and are matched with an alkali solution and an alcoholic solution to prepare the corrosive liquid. Compared with the prior art, the invention has the advantages that: experimental results show that the reflectivity of solar light can be reduced to between 6 and 8 percent by adopting the texture surface of the monocrystalline silicon prepared by the corrosive liquid. Moreover, the texture surface of the monocrystalline silicon has higher short-circuit current and higher photoelectric conversion efficiency.

The invention discloses a process applied to a single-surface corroded p-n junction or suede structure of a crystalline silicon solar cell, which comprises the steps of: firstly, chemically preprocessing a silicon sheet to form a suede structure; secondly, carrying out high-temperature phosphorus diffusion or boron diffusion on the silicon sheet to form a p-n junction; thirdly, removing phosphorosilicate glass or borosilicate glass with an acid chemical liquid; fourthly, carrying out dielectric film protection on the p-n junction of a non-corroding surface of the silicon sheet; fifthly, removing a naturally oxidizing layer of a non-protecting surface, i.e. a corroding surface, or a dielectric film material of the corroding surface with the acid chemical liquid; sixthly, carrying out chemical reaction corrosion on the p-n junction or suede structure of the corroding structure by adopting an alkali chemical liquid; and finally, effectively cleaning the dielectric film on the silicon sheet and the corroding surface of the silicon sheet, and remaining the dielectric film as a functional film of the crystalline silicon solar cell. According to the invention, the process of re-preparing the functional film is avoided, the production cost of the crystalline silicon solar cell is effectively lowered, the low-cost single-surface corroded p-n junction or suede structure is realized, the open-circuit voltage and the short-circuit current of the crystalline silicon solar cell are effectively improved, and the photoelectric conversion efficiency of the cell is finally improved.

The invention discloses a film solar cell and a preparation method thereof. The film solar cell comprises a front electrode layer, a semiconductor layer, a back electrode layer and a tunneling rectification layer. The tunneling rectification layer of a single-layer or multi-layer structure is arranged between the front electrode layer and the semiconductor layer and/or between the semiconductor layer and the back electrode layer, and is made of at least one selected from metal oxide, metal nitride, metal sulfide and metal fluoride. The surface(s) of the front and/or back electrode layer are/is provided with the tunneling rectification layer, the tunneling rectification layer is used to carry out electron rectification, and thus, carrier combination is effectively avoided, the short-circuit current and open-circuit voltage of the solar cell are improved, and the photoelectric conversion efficiency is further improved.

The invention discloses a polymer solar cell and a preparation method. The polymer solar cell comprises a substrate, an anode layer, a modification layer of anode, a photovoltaic active layer, a modification layer of cathode and a cathode layer which are connected mutually and successively in two pieces, wherein, the modification layer of cathode is titanium dialkoxy acetylacetonate film. The invention uses titanium diisopropoxide acetylacetonate as the material of the modification layer of cathode and introduces the material into the polymer solar cell, so increases the photovoltaic conversion efficiency of the solar cell. Meanwhile, the invention has the advantages of simple process, low cost and good experiment repeatability by comparing to the existing cell of the modification layer of cathode with lithium fluoride. Moreover, a very simple spin-coating method coats titanium diisopropoxide acetylacetonate on the photovoltaic active layer, so the invention also has the advantages of simple preparation process, easy control of thickness, no damage on the lower photovoltaic active layer, and being suitable for large-scale industrial production.

The invention discloses front and back surface electrodes of a screen printing crystalline silicon solar cell and a manufacturing method thereof; array points which are not printed into conductive paste are manufactured in an electrode main gate line; and the graphics of each array point is in a closed type. The manufacturing method comprises the step of arranging latex film array points on the screen printing plate electrode main gate line for blocking the conductive paste. The positive and back surface electrodes of the screen printing crystalline silicon solar cell and the manufacturing method thereof can effectively save the conductive paste on the positive and back surfaces of the crystalline silicon solar cell, and effectively eliminate the stress caused by different expansion coefficients of silver silicon alloy and silicon, thereby reducing the bending rate of a cell film and the welding debris rate of a component; the invention can enhance the adhesion firmness of the main gate line conductive paste on the silicon surface after being sintered and effectively solve the falling-off problem of a silver main gate line; and the invention reduces the surface contact area of the conductive paste and the silicon, and increases the open-circuit voltage and the short-circuit current.

The invention relates to a point-contact front electrode structure of a solar cell. The front electrode structure is a bridge structure. The bridge structure comprises a bridge foundation, bridge piers and a bridge girder; the bridge foundation is weldable, silver paste or nickel paste is sintered to form the bridge foundation, and the bridge foundation is in excellent ohmic contact with a semiconductor of a substrate; solder paste is melted by heat to form the bridge piers, and the bridge girder can be conductively and mechanically connected with the bridge foundation by the bridge piers; the bridge girder comprises conducting metal wires, and currents of the various bridge piers can be gathered and led out by the aid of the bridge girder. The front electrode structure has the advantages that points of a point-contact electrode can be connected with one another by the metal wires, so that the total area of an electrode region is reduced, photon-generated carriers which are composited with one another on the surface of the cell are effectively reduced, the illumination shielding area of the electrode can be effectively reduced owing to the suspended metal wires, light injection is effectively increased, an open-circuit voltage and a short-circuit current are increased, and the conversion efficiency of the solar cell is improved; consumption of expensive silver is reduced owing to the structure, and accordingly the production cost of the solar cell is lowered.