Hydrogen passivation method for solar cell

A technology for solar cells and solar cells, applied in circuits, photovoltaic power generation, electrical components, etc., can solve problems such as weak passivation, and achieve the effects of easy industrialization, improved conversion efficiency, and high practical value.

Active Publication Date: 2015-05-20
杭州晶宝新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Whether it is deposition of silicon nitride film or hydrogen plasma treatment, the problem with these methods is that hydrogen can only be introduced into the near-surface layer of the silicon crystal (usually less than a few microns), but cannot introduce high-concentration hydrogen atoms into the...

Method used

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  • Hydrogen passivation method for solar cell
  • Hydrogen passivation method for solar cell
  • Hydrogen passivation method for solar cell

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Select a boron-doped p-type monocrystalline silicon solar cell, and attach the cell to the image 3 stacked in a manner. When stacking, you can choose to insert conductive aluminum foil at intervals between the cells. The advantage is that it can protect the electrodes of the cells from scratching or wearing each other. Even so, it still needs to be handled carefully and lightly.

[0042] The cells are placed in a vacuum chamber, which has a built-in temperature-controlled heating platform and a constant-voltage DC power supply. Evacuate the vacuum chamber to reduce the air pressure to below 0.1 Torr.

[0043] Set the temperature of the heating table to 220°C to heat the solar cells; at the same time, apply a forward bias voltage to the cells, and set the voltage that each cell withstands to 0.4V. The cells were subjected to hydrogen passivation treatment under the above conditions, and the treatment time was set to 60 minutes according to formula 1. The processing i...

Embodiment 2

[0046] A boron-doped p-type polysilicon solar cell is selected, and hydrogen passivation treatment is performed as in the process in Example 1. Processing conditions Set the temperature of the heating platform at 240°C to heat the solar cells; at the same time, apply a forward bias voltage of 0.6V to the cells. The treatment time was set at 40 minutes. The processing is then complete and the cells are taken out to cool in the air.

[0047] attached Figure 6 Shown is the performance comparison of the polycrystalline silicon solar cell before and after applying the treatment of the present invention. For the 156 polycrystalline cells, after treatment, the open-circuit voltage increases by 1mV, the short-circuit current increases by 0.03A, and the absolute value of the conversion efficiency increases by 0.1%.

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Abstract

The invention relates to a hydrogen passivation method for a solar cell, which comprises the following steps: (1) keeping the solar cell in a temperature range of 100 DEG C to 400 DEG C; (2) simultaneously applying a forward voltage to a pn junction of the solar cell to reduce a built-in potential. The method disclosed by the invention has the beneficial effects of solving the difficult problem how to introduce high-concentration hydrogen atom into a solar cell matrix, having an obvious passivation effect on impurities and defects in a semiconductor material matrix and reducing recombination activity of the semiconductor material matrix used as an electronic-hole composite center; the method is beneficial for improving conversion efficiency of the solar cell. Meanwhile, the method can be well compatible to the manufacturing process of an existing solar cell piece, is easy for industrialization implementation and has high practical value.

Description

technical field [0001] The invention relates to the technical field of solar cell manufacturing, in particular to a hydrogen passivation method for solar cells. Background technique [0002] Solar power technology is currently one of the most important renewable energy technologies. At present, the cost of solar power generation is still higher than that of traditional energy sources, which restricts its large-scale application. For this reason, the industrial and scientific circles have been devoting themselves to improving the photoelectric conversion efficiency of solar cells and reducing the manufacturing cost of solar cells. [0003] Solar power generation is based on the photovoltaic effect of semiconductor materials. The p-type semiconductor and the n-type semiconductor contact to form a pn junction, which generates a strong internal electric field. When light irradiates the semiconductor, the electrons and holes generated by the excitation are separated by the ele...

Claims

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Application Information

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IPC IPC(8): H01L31/18
CPCH01L31/1876H01L31/202Y02E10/50Y02P70/50
Inventor 陈恩深
Owner 杭州晶宝新能源科技有限公司
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