Mass production device and method for rapidly improving light-induced attenuation of p-type crystalline silicon cells

Abstract

The invention discloses a mass-production apparatus capable of fast improving photo-induced degradation of a P-type crystalline silicon cell. The apparatus includes: a power source, a thermotank, a conveying belt which penetrates the thermostat and a silicon chip carrying case which is arranged on the conveying belt. The silicon chip carrying case includes an upper conducting layer and a lower conducting layer which are respectively connected to a positive electrode and a negative electrode of the power source via a wire. The P-type crystalline silicon cell slice layers are stacked inside the silicon chip carrying case. A plurality of heating apparatuses and a plurality of ventilating apparatuses are arranged inside the thermotank. The heating apparatuses are installed on the thermotank inner wall on two sides of the conveying belt. The ventilating apparatuses are installed in the surrounding of the heating apparatuses. The apparatus and the method of the invention can simultaneously improve photo-induced degradation of bulk solar cells and are easy to operate. Processing time is effectively shortened by optimizing energized current and heating temperature. According to the invention, production capacity is increased, production cost is lowered, and the requirement for industrial production is met.

Description

Technical field [0001] The invention relates to a mass production device for rapidly improving the light-induced attenuation of p-type crystalline silicon solar cells, belonging to the field of solar cells. Background technique [0002] Solar energy has the "infinity" of reserves, the universality of existence, the cleanness of utilization, and the economic efficiency of utilization. It plays an important role in the transformation of the world's energy structure and becomes an ideal alternative energy source. P-type crystalline silicon solar cells and modules are currently the mainstream of solar cells, and their market share has remained above 80% in recent years. [0003] At present, the cell efficiency of p-type crystalline silicon solar cells will decrease after exposure to light, and the attenuation degree can even reach 1-9% (relative value). This is especially obvious in p-type monocrystalline silicon cells, with additional solar cells and The power loss of the component, ...

AI Technical Summary

Problems solved by technology

[0003] At present, p-type crystalline silicon solar cells will experience a decrease in cell efficiency after being exposed to light, and the attenuation can even reach 1-9% (relative value), which is especially obvious in p-type monocrystalline silicon cells. Additional solar cells and Power loss of components, and prone to further loss of power generation due to component power mismatch

[0004] It is generally believed that the cause of light-induced attenuation in crystalline silicon solar cells is mainly boron-oxygen recombination. Photo-generated current carrying or current injection will cause interstitial oxygen atoms and boron atoms in p-type silicon wafers to form boron-oxygen complexes, reducing the minority carrier lifetime, resulting in Decreased cell and module efficiency

At present, there are two main ways to improve the light-induced attenuation of the battery. One is to improve the silicon wafer and reduce the concentration of boron or oxygen in the silicon wafer, but both will bring about a significant increase in production costs, which is not conducive to industrialization. The other is Light injection or electric injection combined with heating method, but the method of light injection combined with heating needs to continuously illuminate the cell, and each light source can only process a single cell at the same time, which is difficult to industrialize and high in cost; The method of electric injection and heating takes 30-180 minutes, which takes a long time, and each group can only process 5-50 cells. When the number of cells continues to increase, it is difficult to ensure the temperature uniformity between the two ends and the middle. Difficulties in mass production

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