Provided is a solar cell and a tandem solar cell. The solar cell includes substrate, tunnel dielectric layer, doped conductive layer and first electrode. First surface of the substrate includes metallization and non-metallization regions. The metallization region has first texture structure including first recess. The non-metallization region has second texture structure including second recess. Bottom surface of the first recess has a smaller average one-dimensional size than the second recess. The metallization region includes first and second regions, the first regions are arranged at intervals in first direction, the second regions are arranged at intervals in second direction and connected between adjacent first regions. The tunnel dielectric layer is arranged on the first texture structure. The doped conductive layer is arranged on the tunnel dielectric layer away from the substrate. The first electrode includes finger electrodes electrically connected with the doped conductive layer and corresponding to the first regions.

The present application discloses a back junction solar cell and a preparation method therefor. The back junction solar cell comprises: a P-type silicon substrate; a tunneling oxide layer, an N-type doped silicon layer and a first passivation anti-reflection layer which are sequentially arranged on a first main surface of the P-type silicon substrate in a stacked manner from inside to outside; a back electrode which penetrates through the first passivation anti-reflection layer to be electrically connected with the N-type doped silicon layer; a P+ local front surface field formed by Group III elements and a front electrode formed by Group III elements arranged on a second main surface of the P-type silicon substrate, wherein the front electrode is connected to the local front surface field, and the position of the local front surface field corresponds to the position of the front electrode; a second passivation anti-reflection layer formed on the second main surface of the P-type silicon substrate in a region where the front electrode is not arranged and on the front and lateral sides of the front electrode.

Provided is a photovoltaic module, including a cell string, a bus bar, and at least one solder strip configured to connect the bus bar to a cell of the cell string. Along a thickness direction of the photovoltaic module, the bus bar is located at a side where a back surface of the cell is located, and at least part of a projection of the bus bar along the thickness direction Z of the photovoltaic module is located within a projection of the cell string. The solder strip includes a connecting section and a bending section, the connecting section is connected to the cell, the bending section bends towards the side where the back surface of the cell is located and is connected to the bus bar, and an extension direction of the bending section is not parallel to an extension direction of the connecting section.

The present disclosure relates to the technical field of solar cells. Disclosed are a back contact cell module and a system. The assembly includes a cell string, an insulation bar, and a bus bar; the cell string includes a first cell piece and a second cell piece, which are adjacent to each other; the insulation bar is provided on a backlight surface of the first cell piece; a second ribbon is connected to the second cell piece and the bus bar, respectively; and the insulation bar blocks the second ribbon and the first cell piece.

Methods of soldering wire, such as traces or ribbon, onto single or multi-busbar solar cells. Devices constructed with such methods may also be covered. Methods may include providing a wire, such as a trace or ribbon, tack soldering the wire at one or more locations to a workpiece, such as solar cell component, and then passing the combined tacked wire and solar cell component through a heating zone where heat is applied to the backside of the solar cell component such that solder in contact with the wire melts and solders the wire to the solar cell component.

A back contact solar cell, including: fingers including rows of first fingers and rows of second fingers; solder joints, and a connection electrode. The fingers, the solder joints, and the connection electrode are on a first surface of the cell. The first fingers and the second fingers are alternatingly arranged along a first direction and extend in a second direction. The connection electrode extends in the first direction. A respective first finger including first and second disconnected sections of the first fingers is connected to another first finger of the first fingers via at least a portion of the connection electrode. The connection electrode extends in the first direction in a wavy form that includes a plurality of arcs.

The present disclosure relates to a photovoltaic module and a method for preparing the same. The method includes: printing a grid line paste on a semi-finished solar cell and sintering the grid line paste into a grid line precursor; performing a laser-induced contact treatment to form a metal grid line, and ensuring the metal grid line to extend through a passivation layer to be in a direct contact with a semiconductor layer; forming an enhancing conductive microstructure at a contact interface between the metal grid line and the semiconductor layer; placing an electrical connector on the metal grid line, and pressing the electrical connector, such that the electrical connector and the metal grid line have a conductive contact area; applying an adhesive to the conductive contact area; and laminating.

Provided in the present disclosure is a profiled solder ribbon, which relates to the technical field of solar cell manufacturing. The profiled solder ribbon according to the present disclosure includes a plurality of solder ribbon units connected in sequence, and each solder ribbon unit includes a profiled segment, a first transition segment, a flat segment, and a second transition segment connected in sequence. The section of the profiled segment is in the shape formed by superimposing the triangle with the rectangle, so that light, when shining on an area of the triangle, can be reflected to a solar cell by the triangle to increase the light utilization. In addition, a lower part of a section of the profiled solder ribbon according to the present disclosure is rectangular, which can share part of the copper consumption required for electrical conduction, reduce the shielding of cells, and improve the light utilization.

A back contact cell includes a cell substrate and first insulation members. Fingers having two polarities are alternately arranged on a back surface of the cell substrate. The back surface includes current collection regions and non-current collection regions which are distributed in a staggered manner. The first insulation members are arranged at edges of the non-current collection regions in a continuous manner in an extension direction of the current collection regions, and cover portions of the fingers located in the non-current collection regions close to the current collection regions.

Photovoltaic devices, and methods of making the same, are described. A photovoltaic device comprises a plurality of electrically connected photovoltaic cells, wherein the photovoltaic cells comprise a conducting layer having a first surface and a second surface, the first surface facing an absorber layer; an insulating material disposed on the second surface over at least one of the photovoltaic cells; a conductive member on the insulating material, wherein the insulating material is configured to electrically insulate the conductive member from the second surface; a bus member electrically coupled to the one of the plurality of photovoltaic cells and to the conductive member; and an edge seal comprising a sealant material extending over at least a portion of the one of the plurality of photovoltaic cells; wherein the bus member is disposed between the edge seal and the plurality of photovoltaic cells.