Double-face passivated metal wrap through (MWT) solar battery and manufacturing method thereof

Abstract

The invention discloses a double-face passivated metal wrap through (MWT) solar battery and a manufacturing method thereof. The MWT solar battery comprises a silicon substrate, an emitter electrode and a base electrode, wherein a diffusion doping layer is arranged on the front surface of the silicon substrate; a SiNx antireflective layer is positioned above the diffusion doping layer; a front surface dielectric film layer is arranged between the SiNx antireflective layer and the diffusion doping layer; a back surface dielectric film layer is arranged on the aluminum layer surface of the back surface of the silicon substrate; a back surface mask layer is arranged on the outer surface of the back surface dielectric film layer; the base electrode is positioned on the outer surface of the back surface mask layer. Through a novel process for manufacturing the battery, passivated dielectric film layers are additionally arranged on the front and back of the battery, and the back surface mask layer is additionally arranged on the back surface of the battery, so that the probability that minority carriers are recombined at the interface of the front and back surfaces of the battery is obviously lowered, the open-circuit voltage of the battery is increased, the optical reflectivity in the battery is improved, the short-circuit current of the battery has obvious gain, the photoelectric conversion efficiency of the battery is high, and the operability is high.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a double-sided passivated MWT solar cell and a manufacturing method thereof. Background technique [0002] MWT (Metal Wrap Through): translated as metal perforation and winding technology, applied in solar cells, through laser or other methods to realize the perforation process on the original silicon wafer, to achieve the purpose of leading the original electrode to the same surface, by reducing BUSBAR The shading area increases the conversion efficiency of the battery. [0003] Double-sided passivation technology is generally used in high-efficiency solar cell technology. The passivation process in crystalline silicon solar cells refers to passivating some minority carrier recombination centers on the front and back surfaces of silicon crystals by some means to reduce minority carrier recombination. Ability. The commonly used means are H 2 bulk passivation, some passivat...

AI Technical Summary

Problems solved by technology

However, the current battery structure results in low optical reflection on the back of the battery, which is not conducive to improving the open-circuit battery and short-circuit current of the battery.

Images