Fudan University prepared high-efficiency black silicon solar cells

The efficiency of the battery prepared by using black silicon material reaches 18.97%, breaking the highest level of the international similar structure battery.

Recently, Lu Ming, Fudan University, Department of Light Science and Engineering Group by p-type single crystal Si (100) on the proliferation of phosphorus prepared pn junction, the use of chemical etching method to form porous n-type porous black silicon, and the use of the species Black silicon material to produce efficient solar cells.

Since the silicon nanocrystal band gap is higher than the crystalline silicon, the open-circuit voltage of the black silicon cell is also higher than that of the corresponding planar silicon cell. Moreover, the graded bandgap structure of the emitter also 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.

It is reported that this related research results have been published in "nanotechnology", at the same time selected "nanotechnology selection." (Ma Haijun)

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