Fudan University prepared a high efficiency black silicon solar cells 18.97%

Lu Ming, Department of Light Science and Engineering, Fudan University, made use of black silicon materials to produce highly efficient solar cells. Relevant research results recently published in "nanotechnology", at the same time selected "nanotechnology selection."

It is reported that the research group proposed a new method to improve battery efficiency. This method uses black silicon material, the efficiency of the prepared battery breaks through the highest level of the international similar structure battery, reaching 18.97%. Researchers fabricated pn junctions by diffusing phosphorous on p-type single-crystal Si (100), forming porous black silicon in the n-type emitter by chemical etching with less than 0.3% UV-visible range reflectivity.

Compared with planar crystalline silicon cells, this black silicon cell has a wide spectrum of characteristics, its photoelectric conversion efficiency as high as 18.97%. The open circuit voltage of the black silicon cell is higher than that of the corresponding planar silicon cell because the bandgap of the silicon nanocrystal is higher than that of the crystalline silicon. Moreover, the gradient bandgap structure of the emitter suppresses the recombination of electrons and holes on the front surface. Due to the high absorbance in the short wavelength range, the photovoltaic response at short wavelengths is also better.

The researchers said that compared with other methods of making black silicon cells, this black silicon is simple to fabricate and has a lower reflection (less than 0.3%) over a wide wavelength range, a quantum efficiency over a short wavelength range High, indicating a smaller surface composite. No need to add any equipment to manufacture this kind of black silicon solar cell, which is simple, lower cost and better effect than traditional suede antireflection film.

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