Structure for Reducing Black Lines on the Back of Back Passivated Solar Cells

Abstract

The invention relates to a photovoltaic structure, in particular to a structure for reducing black lines on the back face of a back-passivated solar cell. According to the technical scheme, the structure for reducing the black lines on the back face of the back-passivated solar cell comprises a cell substrate, the back face of the cell substrate is covered with a passivation layer, and a conductive layer is printed on the passivation layer and is in ohmic contact with the cell substrate through window holes in the passivation layer. The structure is compact, the black lines on the back face of the back-passivated solar cell can be effectively reduced, the series resistance of the cell can be improved, and the conversion efficiency of the cell can be improved; meanwhile, the brightness degree of an image of the cell under a photoluminescence or electroluminescence detection device can be effectively improved, and the structure is safe and reliable.

Description

technical field [0001] The invention relates to a photovoltaic structure, in particular to a structure for reducing black lines on the back of a passivated solar cell. Background technique [0002] Rear passivation solar cells are the development direction of crystalline silicon solar cells. By coating a passivation film on the back of solar cells, the minority carrier lifetime can be improved, thereby improving cell efficiency. In actual implementation, if the window area of ​​the back passivated solar cell is large, the area of ​​the back passivation area of ​​the cell will be reduced, thereby reducing the photoelectric conversion efficiency of the cell; while the window area is small, the aluminum paste and silicon cannot form Good ohmic contact, there will be "voids", which will affect the contact resistance of the back passivated battery. If the "voids" of the back passivated battery are continuously generated at the adjacent window positions and have a certain length, ...

AI Technical Summary

Problems solved by technology

In actual implementation, if the window area of ​​the back passivated solar cell is large, the area of ​​the back passivation area of ​​the cell will be reduced, thereby reducing the photoelectric conversion efficiency of the cell; while the window area is small, the aluminum paste and silicon cannot form If the ohmic contact is very good, there will be "voids" that will affect the contact resistance of the back passivated battery. If the "voids" of the back passivated battery are continuously generated at the adjacent window positions and have a certain length, this type of battery Under the detection equipment of photoluminescence or electroluminescence, there will be a strip-shaped black line area on the back, which will affect the performance of the back passivation battery

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