Hydrogen passivation technology for improving light failure problem of mono-crystalline solar cell

Abstract

The invention discloses a hydrogen passivation technology for improving a light failure problem of a mono-crystalline solar cell. The technology comprises the following steps: regulating the conversion quantity, between the high compound state and the low compound state, of B-O defect in a silicon substrate by using the H in the SiN:H film on the solar cell surface and controlling the current andtemperature and like elements exerted on a cell, and regulating the passivation quantity on the B-O defect by the H by using the current, thereby achieving a new stable state, wherein this state cannot return to the high compound state to influence the cell efficiency due to the illumination, so that the failure rate is reduced to within 1.5% under the standard light failure testing condition whenthe efficiency reduction degree of the mono-crystalline solar cell is within 0.07%. The technology disclosed by the invention is not limited to the mono-crystalline solar cell, and further comprisesmono-crystalline-like and polycrystalline solar cells, and the photoelectric conversion efficiency of the cell cannot be reduced by the light failure improved obtained on the polycrystalline solar cell. The technology temperature, the current and the time selected by the invention are easy to achieve and control; the technology is simple in method, obvious in effect, and capable of being compatible with the industrial production, and has high practical value.

Description

technical field [0001] The invention relates to the field of manufacturing single crystal solar cells, in particular to a process for improving the light attenuation of single crystal solar cells. Background technique [0002] In the era of new energy, photovoltaic power generation is a clean, safe and convenient clean energy with an important position and one of the most important renewable energy technologies. At present, my country is vigorously supporting the development of the photovoltaic industry, and the production of batteries and the installed capacity of modules are increasing year by year. Therefore, in-depth research and utilization of solar energy resources is of great significance to alleviate the resource crisis and improve the ecological environment. [0003] At present, the mainstream photovoltaic cells in the market are boron-doped P-type silicon-based solar cells. The current technology cannot completely remove the oxygen impurities in the silicon body d...

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream photovoltaic cells in the market are boron-doped P-type silicon-based solar cells. The current technology cannot completely remove the oxygen impurities in the silicon body during the production process, which leads to the obvious efficiency attenuation phenomenon of crystalline silicon solar cells under long-term sunlight.

As one of the most efficient photovoltaic cells at present, the light attenuation of monocrystalline solar cells is very obvious, generally reaching 2.5-3%, which is very unfavorable for maintaining stable power generation and severely restricts the development of the photovoltaic industry.

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