Three-junction gallium arsenide solar cell matched with Mars spectrum

Abstract

The invention discloses a three-junction gallium arsenide solar cell matched with a Mars spectrum. The solar cell comprises a GaInP top cell, a GaInAs middle cell and a Ge bottom cell which are sequentially connected in series. The working wavelength of the GaInP top cell ranges from 300 nm to 670 nm. The working wavelength of the cell in the GaInAs is 500 nm to 900 nm; the working wavelength of the Ge bottom cell ranges from 900 nm to 1800 nm; the band gap of the GaInP top cell is 1.85 eV; the band gap of the cell in the GaInAs is 1.37 eV; and the voltage of the Ge bottom cell is 0.67 eV. According to the solar cell, aiming at the Mars surface spectrum, the cell structure is matched with the Mars spectrum to achieve balance through the optimization of three technologies of reducing the band gap of the top cell and adding the Bragg reflector and the multi-layer antireflection film, so that the top cell and the middle cell can equally utilize light energy at the wave band of 300-950nm, and the energy output efficiency of the solar cell under the Mars spectrum is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a triple-junction gallium arsenide solar battery matching the spectrum of Mars. Background technique [0002] The solar cell array uses the principle of photoelectric conversion to convert solar energy into electrical energy, powers the satellite during the light period, and charges the battery pack. At present, solar cell arrays mainly use triple-junction gallium arsenide solar cells, but the existing cell designs are based on the AM0 (extra-atmospheric sun) spectral conditions in the outer space of the earth to ensure that the cells have the best overall performance throughout their life cycle. Performance. However, the solar spectrum on the surface of Mars, due to the high scattering effect of dust and other particles in the process of passing through the Martian atmosphere, compared with the AM0 spectrum of the earth's orbit, such as figure 1 As shown, the blue light segm...

AI Technical Summary

Problems solved by technology

However, the solar spectrum on the surface of Mars, due to the high scattering effect of dust and other particles in the process of passing through the Martian atmosphere, compared with the AM0 spectrum of the earth's orbit, such as figure 1 As shown, the blue light segment is weakened, and the red and infrared light segments are enhanced, resulting in lower current in the top cell and higher current in the middle cell. The spectrum on Mars matches the AM0 spectrum in space. Mismatch, need to redesign and optimize

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