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Silicon Solar Cells Based on Femtosecond Laser Processing

Author: ShaoZhuFeng
Tutor: QuShiLiang；WangQiang
School: Harbin Institute of Technology
Course: Optics
Keywords: femtosecond laser micro-nano-fabrication amorphous silicon so-lar cell nanosecond laser
CLC: TM914.4
Type: Master's thesis
Year: 2009
Downloads: 348
Quote: 0
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Abstract


Solar cell is an important clean-energy device, which can convert light energy into electrical energy. At present, amorphous silicon solar cell has become most promising one of solar cells, due to their relatively low production costs in comparison with monocrystalline silicon, polycrystalline silicon, multi-compounds, and other new types of solar cells. However, large-scale production of amorphous silicon solar cells is limited because of the rather low photoelectric conversion efficiency. With the development of laser technology, femtosecond laser has gradually become a kind of effective tool for micro-nano-fabrication of materials. But it has been rarely reported that femtosecond laser etching can improve the efficiency of silicon solar cells, so far. So we have adopted the laser etching technology to embellish the surface of amorphous silicon solar cells, and the efficiency of solar cells is greatly improved.In this paper, in order to improve the photoelectric conversion efficiency of amorphous silicon solar cell, laser etching from the front and back of amorphous silicon solar cells has been conducted, respectively, based on the linearly polarized femtosecond laser fabrication technology. Through linear focused laser scanning on silicon film surface from the back of the solar cell, periodic stripe-like structures were formed on the surface of n-type silicon, and micro-porous structures were also formed. By comparing the photoelectric conversion of solar cell characteristics before and after femtosecond laser processing, and especially by the comparison of the open circuit voltage (Voc) and short-circuit current (Isc), it is found that the Voc and Isc of solar cells have been markedly improved after femtosecond laser etching, and the product of both the Voc and Isc can be increased 9 times. For the case of laser processing from the front, periodic stripe-like structures and micro-porous structures were also formed on the surface of p-type silicon. It is found that the largest product of Voc and Isc of solar cell can be increased 9 times. To further reduce the cost for laser processing of solar cell surface, we also have processed amorphous silicon solar cells by nanosecond laser. It is found that the product of Voc and Isc can be increased 2.7 times after treatment.We have also discussed the dependence of the product of Voc and Isc on laser energies and scanning intervals. The formation of the porous structures on silicon film plays an important role in the improvement of photoelectric conversion efficiency.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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