Embodiments of the present disclosure relate to a solar cell and a photovoltaic module. The solar cell includes a bottom cell, a recombination layer, and a top cell stacked in a first direction. The bottom cell includes at least one first electrode, a first semiconductor conductive layer, a substrate, and a second semiconductor conductive layer stacked in the first direction. The recombination layer includes a dielectric layer and a first transparent conductive layer stacked in the first direction, the second semiconductor conductive layer has a first surface facing towards the top cell, and the dielectric layer is formed on at least a portion of the first surface. In this way, the photoelectric conversion efficiency of the solar cell can be at least improved.

A modified tunnel oxide layer and a preparation method, a TOPCon structure and a preparation method, and a solar cell are provided. The modified tunnel oxide layer is SiO.sub.x subjected to plasma surface treatment, and a Si.sup.4+ content in the SiO.sub.x is greater than or equal to above 18%. The density of the interface state subjected to plasma surface treatment decreases, and compared with the silicon oxide layer prepared in the prior arts, boron has a low diffusion rate in the modified silicon oxide layer and hence the damaging effect of the boron on the tunnel oxide layer is reduced effectively, thereby improving the integrity of the silicon oxide layer and maintaining chemical passivation effect. The modified tunnel oxide layer significantly increases the performance indexes of the TOPCon structure.

This application provides a solar cell, a production method therefor, and a photovoltaic assembly. In one aspect, a solar cell includes a silicon substrate and a majority carrier tunneling field effect layer and a front selective contact layer stacked in sequence on a light receiving side of the silicon substrate. The front selective contact layer and the silicon substrate are of a same doping type. The majority carrier tunneling field effect layer includes a dielectric material with a dielectric constant greater than or equal to 8. A density of fixed charges in the majority carrier tunneling field effect layer is greater than or equal to a preset density. A type of the fixed charges in the majority carrier tunneling field effect layer is the same as a charge type of minority carriers in the silicon substrate.

A solar cell, a preparation method thereof, a photovoltaic module, and a photovoltaic system, wherein the solar cell includes a substrate and a first tunnel oxide layer and a passivation medium layer sequentially stacked on a first surface of the substrate. The first tunnel oxide layer is at least partially in contact with the first surface. The passivation medium layer includes at least a transparent conductive oxide layer.

A cell assembly includes a silicon substrate; a first doped region and a second doped region, having opposite polarities. The first doped region is an N-type doped region; the first doped region includes a first doped layer, a passivation layer, and a second doped layer; the passivation layer of the first doped region is provided on the first doped layer of the first doped region; and a conductive channel is formed in the passivation layer of the first doped region.

A solar cell module and a solar energy power system with ice-dissolving function are disclosed. The solar cell module includes a substrate, a flexible lithium ceramic battery, a first bonding layer, a conductive heating film layer, a second bonding layer, several solar cells, a waterproof film layer, a third bonding layer, a highly transparent light-concentrating ETFE layer and a ring bonding wall. The invention stores part of the power generated by the solar cells in the flexible lithium ceramic battery. When the solar cell module encounters temperatures below freezing point, the power in the flexible lithium ceramic battery can be controlled to be released to the conductive heating film layer to generate heat and dissolve the ices on the surface of the solar cell module.

A manufacturing method for a solar cell includes: providing a P-type silicon wafer, the P-type silicon wafer being provided with a first surface and a second surface opposite to the first surface; sequentially depositing an oxide layer, a doped amorphous silicon film layer, and a silicon oxide mask layer on the first surface of the P-type silicon wafer; and removing the oxide layer, the doped amorphous silicon film layer, and the silicon oxide mask layer coated on the second surface. According to the manufacturing method, the surface texture uniformity of the front surface of a cell piece is can be further effectively improved, and the appearance of the front surface of the cell is improved, and thus, the cell efficiency and the product yield of the solar cell are improved. The present application also relates to a corresponding solar cell.

A solar cell and a photovoltaic module is disclosed. The solar cell includes a silicon substrate, and the silicon substrate includes a front surface and a back surface arranged opposite to each other. P-type conductive regions and N-type conductive regions are alternately arranged on the back surface of the silicon substrate. Front surface field regions are located on the front surface of the silicon substrate and spaced from each other. The front surface field regions each corresponds to one of the P-type conductive regions or one of the N-type conductive regions. At least one front passivation layer is located on the front surface of the silicon substrate. At least one back passivation layer is located on surfaces of the P-type conductive regions and N-type conductive regions.

A solar cell and a photovoltaic module are disclosed, including: a substrate; a tunneling dielectric layer and a doped conductive layer disposed on the substrate, the tunneling dielectric layer being disposed between the doped conductive layer and a surface of the substrate, the doped conductive layer having a N-type or P-type doping element and having a plurality of first heavily doped regions spaced apart from each other and extending in a first direction, a doping concentration in the first heavily doped regions being greater than that in other regions of the doped conductive layer; a passivation layer disposed on a surface of the doped conductive layer facing away from the substrate; and a plurality of electrodes spaced apart from each other, extending in a second direction and penetrating the passivation layer to contact the doped conductive layer, at least two first heavily doped regions contacting a same electrode.

A solar cell and a photovoltaic module including the same are provided. The solar cell includes a substrate having a first surface and a second surface opposite to each other; a first passivation stack disposed on the first surface and including a first oxygen-rich dielectric layer, a first silicon-rich dielectric layer, a second oxygen-rich dielectric layer, and a second silicon-rich dielectric layer that are sequentially disposed in a direction away from the first surface, wherein an atomic fraction of oxygen in the first oxygen-rich dielectric layer is less than an atomic fraction of oxygen in the second oxygen-rich dielectric layer; a tunneling oxide layer disposed on the second surface; a doped conductive layer disposed on a surface of the tunneling oxide layer; and a second passivation layer disposed on a surface of the doped conductive layer.