Research On Behaviours Of Cu（In, Ga）Se₂Solar Cells Under Proton And Electron Combined Irradiation

Using the ground-based simulation equipment for space irradiationenvironment, the single, sequential and combined irradiation of50keV proton and50keV electron to the Cu(In1-xGax)Se2solar cells were experienced. Also, the samething has been done under50keV proton and1MeV electron. The three kinds ofdose of the proton irradiation were1E11p/cm~2,1E12p/cm~2and1E13p/cm~2. Thethree kind dose of the electron irradiation were1E14e/cm~2,1E15e/cm~2and1E16e/cm~2.I-V measurement technique was applied to find the decrease law of theelectrical properties of the CIGS solar cells. Furthermore, through the test ofquantum efficiency spectral responses (QE), optical reflectance spectra，scanningelectron microscope (SEM), photoluminescence spectra (PL) and X-ray diffraction(XRD), we were trying to expose the damage mechanisms of CIGS solar cell underproton and electron combined irradiation.The I-V measurements result shows that the cells’ electrical property decreaseas the irradiation dose increase under the condition such as the single proton，single electron and electron-proton combined irradiation environment. In thecondition of the50keV single proton, when the total dose has exceeded1E12p/cm~2,the electrical property decrease significantly. With the irradiation energy under thedose of the1E16e/cm~2, the low-energy and the high-energy single electronirradiation lead to slight damage to the cells. When the dose reach to1E16e/cm~2,the sequential irradiation of the proton followed by electrons shows a recoveryappearance in contrast to that under the single proton irradiation and the recoverwas more clearly under the single electon with the irradiation energy of the1MeVthan that of the50keV. The electrical property decreases more in condition of thesequential irradiation of the electron and the proton than that of the single protonirradiation. But, it was less than that in the condition of the combined irradiationof the electron and proton. Comparing of the different irradiation condition showsthat the damage decreasing order is: synchronous irradiation> sequentialirradiation of the electrons followed by protons> protons irradiation> sequentialirradiation of the protons followed by electrons>> electrons irradiation.The quantum efficiency test applied to irradiated CIGS soalr cells shows thatthe law of QE decrease of was accordance to that of the I-V measurements result.Also, the similar result has been found in the measurement of photoluminescence spectra test and x-ray diffraction test. The cells’ reflectance analysis indicates thatthe surface reflectance decrease with an extremely little amplitude under thedifferent irradiation environment.