Abstract: The application provides a back contact solar cell and a manufacturing method therefor. The manufacturing method comprises: a back surface of a silicon wafer having a first region and a second region, and forming a porous lattice in a tunneling layer located in the first region on the back surface of the silicon wafer; and forming a doped polycrystalline silicon layer on the surface of the tunneling layer facing away from the silicon wafer, where the doping concentration in the doped polycrystalline silicon layer is gradually reduced in the direction distant from the tunneling layer. According to the present application, the region of the doped polycrystalline silicon layer that contacts the tunneling layer has the highest doping concentration, and forms a higher asymmetric offset barrier layer together with the tunneling layer, improving the passivation effect, thereby improving the efficiency of the battery.

Abstract: Disclosed is a back contact solar cell. A back surface field region is arranged as a columnar hole structure, such that the thickness of a silicon substrate can be fully utilized to form a bottom region and a column wall back surface field region, the back surface field collecting area is increased without occupying additional back surface area, and the area of a back surface emitting region is maximized. Meanwhile, the back surface field region is deeply arranged into a silicon wafer, so that majority carriers can be collected in the silicon wafer, the transmission and collection distance is shortened, and the collection effect is enhanced. Thus, the structure can enhance the collecting of the minority carriers and the majority carriers, and the efficiency of the cell is overall improved.

Abstract: Some embodiments of the present disclosure provide a back structure of a solar cell. The back structure includes an aluminum oxide film layer disposed on a silicon wafer substrate, and a first silicon nitride film layer and a first silicon oxynitride film layer, which are successively disposed on the aluminum oxide film layer from inside to outside; and the back structure further includes a second silicon nitride film layer disposed on the first silicon oxynitride film layer. The refractive index of the first silicon nitride film layer is greater than that of the second silicon nitride film layer, and the refractive index of the second silicon nitride film layer is greater than that of the first silicon oxynitride film layer.

Abstract: Some embodiments of the present disclosure provide an N-type TOPCon cell with double-sided aluminum paste electrodes, and a preparation method therefor. The front side of the cell is provided with a front-side silver main grid and a front-side aluminum fine grid, and the back side is provided with a back-side silver main grid and a back-side aluminum fine grid. The method for preparing the cell includes: texturing?B diffusion?BSG removal?alkali polishing?depositing a tunnel oxide layer and a polysilicon layer on a back side of a substrate by means of LPCVD?P diffusion on the back side?PSG removal?plating removal?deposition of an AlOx preparatory layer and a first SiNxHy preparatory layer on the front side?deposition of a second preparatory layer SiNxHy on the back side?UV laser ablation on the front side of the substrate and the back side of the substrate?screen printing.

Abstract: The present disclosure relates to a method for analyzing a geological body with the help of physical and chemical properties thereof, and in particular, to a method for identifying an exudative sandstone uranium deposit. With the method for identifying an exudative sandstone uranium deposit according to the embodiments of the present disclosure, an exudative sandstone uranium deposit formed by an exudation metallogenesis may be systematically identified, so as to guide prediction and prospecting evaluation of a uranium deposit in red variegated sandstone formations of a sedimentary basin, avoid ore dislocation and ore leakage, open up new prospecting positions and spaces, and break through new uranium resources.

Abstract: Disclosed is a coupling system of biomass gasification and waste incineration. A carbon pipeline is communicated between a biomass carbon outlet of a circulating fluidized bed gasifier and an activated carbon injection port of a waste incineration assembly. The activated carbon generated by reaction in the circulating fluidized bed gasifier is sent to the activated carbon injection port through the carbon pipeline to capture harmful substances containing heavy metals and dioxins in flue gas generated by the waste incineration assembly. According to the present application, the activated carbon generated by the circulating fluidized bed gasifier is supplied to the waste incineration assembly, and a mutual coupling between the circulating fluidized bed gasifier and the waste incineration assembly is thereby realized, thus reducing the amount of the activated carbon additionally supplied to the wasted incineration assembly.

Abstract: Disclosed is an air fryer with good thermal insulation, including a body, a cooking cavity located within the body, and a hot air circulation system connected to the cooking cavity, wherein at least part of the outside of the cooking cavity is equipped with a heat insulation component that matches the outer wall of the cooking cavity, the heat insulation component and the outer wall of the cooking cavity are suitable for forming a heat insulation chamber, the heat insulation chamber contains a heat insulation medium. By providing a heat insulation component that matches the outer wall of the cooking cavity on the outside of the cooking cavity to form a heat insulation chamber, and placing a heat insulation medium inside the heat insulation chamber, the air fryer can reduce the impact of high temperatures inside the cooking cavity on the electrical components outside.

Abstract: A battery back passivation structure, a manufacturing method therefor, and a solar cell, the manufacturing method comprising: introducing a dopant gas and a first reaction gas into a coating device, and depositing a doped passivation layer on the back side of a silicon wafer (1); and introducing a second reaction gas into the coating device, and directly or indirectly depositing an internal reflection layer on the surface of the doped passivation layer away from the silicon wafer (1). The described battery back passivation structure comprises a doped passivation layer and an internal reflection layer that are stacked on the back side of the silicon wafer (1), and has enhanced passivation capability.

Abstract: Disclosed is high energy efficient air fryer, the frying basket includes a body, wherein the body is provided with a first cooking chamber and a second cooking chamber, the first cooking chamber is equipped with a first circulation fan, and the first cooking chamber has a first air outlet corresponding to the first circulation fan, the first air outlet is connected to the second cooking chamber through a first pipeline; the second cooking chamber is equipped with a second circulation fan, and the second cooking chamber has a second air outlet corresponding to the second circulation fan, the second air outlet is connected to the first cooking chamber through a second pipeline.

Abstract: Some embodiments of the present invention relate to a technical field of N-type TOPCon solar cells, and disclose a back-side metal electrode of an N-type TOPCon solar cell. The back-side metal electrode includes a substrate, a plurality of first silver fine grids disposed on a passivation film which is on a back side of the substrate, a plurality of second aluminum fine grids overlaid on the plurality of first silver fine grids, and a plurality of first silver main grids disposed perpendicular to the plurality of first silver fine grids. Each of the plurality of first silver main grids is a segmented structure. The back-side metal electrode further includes a plurality of second aluminum main grids, which are formed, in a printing manner, between any two adjacent grid segments of a plurality of grid segments and around each of the plurality of grid segments.

Abstract: The present disclosure relates to a method for analyzing a geological body with the help of physical and chemical properties thereof, and in particular, to a method for identifying an exudative sandstone uranium deposit. With the method for identifying an exudative sandstone uranium deposit according to the embodiments of the present disclosure, an exudative sandstone uranium deposit formed by an exudation metallogenesis may be systematically identified, so as to guide prediction and prospecting evaluation of a uranium deposit in red variegated sandstone formations of a sedimentary basin, avoid ore dislocation and ore leakage, open up new prospecting positions and spaces, and break through new uranium resources.

Abstract: A fryer plate that is accommodated inside a fryer basket, including: a holding portion holding food and including a first air hole; and a support portion coupled to the holding portion. The support portion is coupled to the fryer basket, the holding portion is spaced apart from an inner bottom wall surface of the fryer basket, and a first air passage is formed between the support portion and the inner bottom wall surface of the fryer basket and is in connection with the first air hole.

Abstract: An air conditioning unit includes: a first refrigeration system including a first evaporator, a first compressor, a first condenser, a first one-way valve, and a first throttling element connected in sequence in a loop as well as a second one-way valve connected in parallel with the first compressor, and a first fluorine pump connected in parallel with the first one-way valve; and a second refrigeration system including a second evaporator, a second compressor, a second condenser, a third one-way valve, and a second throttling element connected in sequence in a loop as well as a fourth one-way valve connected in parallel with the second compressor, and a second fluorine pump connected in parallel with the third one-way valve, where the first evaporator and the second evaporator are arranged front and rear in sequence along a return air cooling duct.

Abstract: Some embodiments of the present disclosure provide an N-type TOPCon cell with double-sided aluminum paste electrodes, and a preparation method therefor. The front side of the cell is provided with a front-side silver main grid and a front-side aluminum fine grid, and the back side is provided with a back-side silver main grid and a back-side aluminum fine grid. The method for preparing the cell includes: texturing?B diffusion?BSG removal?alkali polishing?depositing a tunnel oxide layer and a polysilicon layer on a back side of a substrate by means of LPCVD?P diffusion on the back side?PSG removal?plating removal?deposition of an AlOx preparatory layer and a first SiNxHy preparatory layer on the front side?deposition of a second preparatory layer SiNxHy on the back side?UV laser ablation on the front side of the substrate and the back side of the substrate?screen printing.

Abstract: Some embodiments of the present disclosure provide a back structure of a solar cell. The back structure includes an aluminum oxide film layer disposed on a silicon wafer substrate, and a first silicon nitride film layer and a first silicon oxynitride film layer, which are successively disposed on the aluminum oxide film layer from inside to outside; and the back structure further includes a second silicon nitride film layer disposed on the first silicon oxynitride film layer. The refractive index of the first silicon nitride film layer is greater than that of the second silicon nitride film layer, and the refractive index of the second silicon nitride film layer is greater than that of the first silicon oxynitride film layer.

Abstract: Some embodiments of the present invention relate to a technical field of N-type TOPCon solar cells, and disclosed a back-side metal electrode of an N-type TOPCon solar cell. The back-side metal electrode includes a substrate, a plurality of first silver fine grids disposed on a passivation film which is on a back side of the substrate, a plurality of second aluminum fine grids overlaid on the plurality of first silver fine grids, and a plurality of first silver main grids disposed perpendicular to the plurality of first silver fine grids. Each of the plurality of first silver main grids is a segmented structure. The back-side metal electrode further includes a plurality of second aluminum main grids, which are formed, in a printing manner, between any two adjacent grid segments of a plurality of grid segments and around each of the plurality of grid segments.

Abstract: An air conditioning unit includes: a first refrigeration system including a first evaporator, a first compressor, a first condenser, a first one-way valve, and a first throttling element connected in sequence in a loop as well as a second one-way valve connected in parallel with the first compressor, and a first fluorine pump connected in parallel with the first one-way valve; and a second refrigeration system including a second evaporator, a second compressor, a second condenser, a third one-way valve, and a second throttling element connected in sequence in a loop as well as a fourth one-way valve connected in parallel with the second compressor, and a second fluorine pump connected in parallel with the third one-way valve, where the first evaporator and the second evaporator are arranged front and rear in sequence along a return air cooling duct.

Abstract: Some embodiments of the present disclosure relates to the technical field of mobile terminals, and particularly discloses a foldable mobile terminal. The foldable mobile terminal includes: an upper antenna and a lower antenna; and a first contact and a second contact. The first contact is connected to the upper antenna, and the second contact is connected to the lower antenna and is used for touching the first contact. In a case that the foldable mobile terminal is folded so that the first contact and the second contact touch each other, the upper antenna and the lower antenna form a new antenna.

Abstract: Some embodiments of the present disclosure relates to the technical field of mobile terminals, and particularly discloses a foldable mobile terminal. The foldable mobile terminal includes: an upper antenna and a lower antenna; and a first contact and a second contact. The first contact is connected to the upper antenna, and the second contact is connected to the lower antenna and is used for touching the first contact. In a case that the foldable mobile terminal is folded so that the first contact and the second contact touch each other, the upper antenna and the lower antenna form a new antenna.