The disclosed technology generally relates to silicon solar cells and more particularly to a doped layer formed on a textured surface of a silicon solar cell, and methods of fabricating the same. In one aspect, a method of creating a doped layer at a rear side of a crystalline silicon bifacial solar cell is disclosed. The method can include texturing at least a rear side of a silicon substrate of the solar cell to create a pattern of pyramids, thereby creating a pyramidal topology of the rear side. The method can also include forming a doped layer at the rear side by, using epitaxial growth, growing at least one doped silicon epitaxial layer on the pyramids. Simultaneously with forming the doped layer and by using facet evolution, the pyramidal topology of the rear side can be smoothed by the growth of the at least one epitaxial layer. The epitaxial growth can be continued until, on upper parts of a majority of the pyramids, an angle between a surface of the at least one epitaxial layer and the substrate is between 5 to 35. A crystalline silicon bifacial solar cell is also disclosed.

A bifacial double glass solar module including: the upper glass layer, the upper encapsulation layer, the cell layer, the lower encapsulation layer, and the lower glass layer. The upper glass layer, the upper encapsulation layer, the cell layer, the lower encapsulation layer, and the lower glass layer are disposed sequentially from top to bottom. The cell layer includes a plurality of double-sided cells connected in series by a solder strip. The upper glass layer is provided with a first anti-reflection film layer on the upper surface and a first up-conversion thin film layer on the lower surface. The lower glass layer is provided with a second up-conversion thin film layer on the upper surface and a second anti-reflection film layer on the lower surface.

The invention concerns a method for producing a photovoltaic module, comprising:providing a plurality of bifacial photovoltaic cells each having a short-circuit current ratio (B),asymmetrically cutting each cell into two portions, such that the ratio between the surface areas of said portions is substantially equal to the short-circuit current ratio (B) of said cell or to the average short-circuit ratio of the set of cells,juxtapositioning said cell portions in a main plane of the module in order to form pairs of cell portions chosen such that the front face of the first portion has a short-circuit current substantially equal to the short-circuit current of the rear face of the second portion, said portions being arranged such that the front face of the first portion and the rear face of the second portion coincide with the front face of the module,creating an electrical connection of the front face of the first portion with the rear face of the second portion.

A photovoltaic device and method include a doped germanium-containing substrate, an emitter contact coupled to the substrate on a first side and a back contact coupled to the substrate on a side opposite the first side. The emitter includes at least one doped layer of an opposite conductivity type as that of the substrate and the back contact includes at least one doped layer of the same conductivity type as that of the substrate. The at least one doped layer of the emitter contact or the at least one doped layer of the back contact is in direct contact with the substrate, and the at least one doped layer of the emitter contact or the back contact includes an n-type material having an electron affinity smaller than that of the substrate, or a p-type material having a hole affinity larger than that of the substrate.

A bifacial photovoltaic module with at least one bifacial solar cell is provided. The at least one bifacial solar cell includes a substrate with a front-side and a rear-side. The front-side is the light incident side and the rear-side has rear-side contact structure. The rear-side contact structure includes a plurality of electrically conductive contact fingers, which have a first metal, a plurality of solder pads electrically connected to the contact fingers. The solder pads have a top. The solder pads have a second metal, which is different from the first metal. The rear-side contact structure further includes several cell connectors electrically connected to the solder pads. The top of the solder pads is free from the contact fingers in an area along one direction. The cell connectors are disposed planar on or above this area.

A solar energy system for use with tufted geosynthetics on a substantially flat surface having a racking structure with bases and attachments for frictional seating to a tufted geosynthetic ground cover system, a bifacial solar panel mounted to the racking system and electrically connected to a connection box for communicating electrical current to an electricity power conditioner of an electrical current grid generated upon exposure of the solar panel to ambient light. A method of using a solar energy system with tufted geosynthetics cover system is disclosed.

The present invention discloses a bi-facial photovoltaic power generation module, comprising a transparent box, and a cell string and a mounting base which are installed inside the transparent box, wherein the transparent box is provided with a positive terminal and a negative terminal, the cell string is formed by connecting several bi-facial cells in series or in parallel with both ends of the cell string respectively provided with a positive wire and a negative wire welded on the positive terminal and the negative terminal, and the mounting base is provided with strip-shaped slots in which the bi-facial cells can be plugged. According to the present invention, the module can simultaneously generate power on front and back sides thereof and improve its power generation efficiency per unit area.

A bifacial P-type PERC solar cell consecutively comprises a rear silver electrode (1), rear aluminum grid (2), a rear passivation layer (3), P-type silicon (4), an N-type emitter (5), a front silicon nitride film (6), and a front silver electrode (7); a first laser grooving region (8) is formed in the rear passivation layer by laser grooving; the first laser grooving region is disposed below the rear aluminum grid lines, the rear aluminum grid lines are connected to the P-type silicon via the first laser grooving region, an outer aluminum grid frame (9) is disposed at periphery of the rear aluminum grid lines, and the outer aluminum grid frame is connected with the rear aluminum grid lines and the rear silver electrode; the first laser grooving region includes a plurality of groups of first laser grooving units (81) arranged horizontally, each group of first laser grooving units includes one or more first laser grooving bodies (82) arranged horizontally, and the rear aluminum grid lines are perpendicular to the first laser grooving bodies. The solar cell is simple in structure, low in cost, easy to popularize, and has a high photoelectric conversion efficiency.

Embodiments related to solar modules and their manufacture are disclosed. In one embodiment, a solar module may include first and second solar cells with first and second interconnection wires disposed on upper and lower surfaces of one and/or both of the solar cells, and a cross-connect wire disposed between the solar cells and electrically connected to the first and second interconnection wires. A portion of each of the first and second interconnection wires may be removed to electrically isolate the upper surfaces from the lower surfaces of each solar cell while retaining an electrical connection between the upper surface of one cell with the lower surface of the adjoining solar cell through the cross-connect wire. In some embodiments, the first and second interconnection wires may be arranged as a plurality of offset wires located on opposing sides of the solar cells which may reduce stresses applied to the solar cells.

Provided are a bifacial P-type PERC solar cell, preparation method, module and system. The bifacial P-type PERC solar cell consecutively comprises a rear silver electrode (1), rear aluminum grid lines (2), a rear passivation layer (3), P-type silicon (4), an N-type emitter (5), a front silicon nitride film (6), and a front silver electrode (7); the rear silver electrode (1) is perpendicularly connected with the rear aluminum grid lines (2), grid line backbones (10) are disposed on the rear aluminum grid lines (2), an outer aluminum grid frame (9) is disposed around the rear aluminum grid lines (2), the grid line backbones (10) are connected with the rear aluminum grid lines (2), and the outer aluminum grid frame (9) is connected with the rear aluminum grid lines (2) and the rear silver electrode (1); a first laser grooving region (8) is formed in the rear passivation layer (3) with laser grooving, and the rear aluminum grid lines (2) are connected to the P-type silicon (4) via the first laser grooving region (8); the first laser grooving region (8) includes a plurality of sets of first laser grooving units (81) arranged horizontally, each of the sets of first laser grooving units (81) includes one or more first laser grooving bodies (82) arranged horizontally, and the rear aluminum grid lines (2) are perpendicular to the first laser grooving bodies (82). The solar cell is simple in structure, low in cost and easy to popularize, and has a high photoelectric conversion efficiency.