Solar cell panel and crystal silicon wafer thereof

Abstract

The invention relates to the technical field of solar energy, in particular to a solar cell panel and a crystal silicon wafer of the solar cell panel. The solar cell panel is composed of a glass substrate, a transparent electrode layer, the crystal silicon wafer and a back electrode layer, wherein an evaporation layer is laminated on one face of the glass substrate, the transparent electrode layer is located below the evaporation layer, the crystal silicon wafer is arranged below the transparent electrode layer, and the back electrode layer is arranged below the crystal silicon wafer. A first SiO2 film layer, a second TiO2 film layer and a third SiO2 film layer are arranged on the back face of the crystal silicon wafer. By the adoption of the solar cell panel and the crystal silicon wafer of the solar cell panel, more sunlight is absorbed, compared with the prior art that the back surface of a crystal silicon wafer is only provided with a full aluminum back surface field, the transmittivity of sunlight is remarkably reduced, and therefore the photoelectric conversion efficiency of the crystal silicon wafer is greatly improved; in addition, through etching of a contact window, an aluminum film is arranged on the contact window, so that a partial aluminum back surface field is formed; compared with the full aluminum back surface field, due to the fact that the area of a high-recombination region of the aluminum back surface field is reduced, the influence of the high-recombination region on the service life of minority carriers on the back surface of crystal silicon wafer is reduced correspondingly, and therefore the photoelectric conversion efficiency of the crystal silicon wafer is further improved.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a solar energy battery panel and a crystalline silicon wafer thereof. Background technique [0002] With the increasing shortage of energy, the development of renewable energy has attracted more and more attention, and the research on solar cells has continued to deepen. The focus of the development of crystalline silicon solar cells is high efficiency and low cost. Solar energy is an inexhaustible renewable energy source for human beings. It is also clean energy and does not produce any environmental pollution. Among the effective utilization of solar energy; solar photovoltaic utilization is the fastest growing and most dynamic research field in recent years, and it is one of the most watched projects. To this end, people have researched and developed solar cells. The production of solar cells is mainly based on semiconductor materials. Its working principle is to u...

AI Technical Summary

Problems solved by technology

Although the structure set by this process has many advantages, the back surface of the aluminum-silicon alloy formed by sintering has certain advantages in reducing recombination (recombination: a way to reduce the minority carriers on the back of the crystal silicon wafer) and back reflection. In particular, the limitations of the aluminum-silicon alloy region itself, which is the high recombination region, are more obvious, and the reflectivity of the aluminum back field to sunlight is low, and the long-wave response is poor, which limits the further improvement of the photoelectric conversion efficiency of solar cells.