Performance Analysis Of Solar Cells Under Proton Irradiation

As the main power supply system in aerospace work,solar cells need to have high efficiency and reliability in the face of complex space environments.Due to the fact that solar cells require direct exposure to the space environment for illumination,they are easily affected by the irradiation of various particles in space,which not only reduces the battery life,but also causes serious harm to the entire space system.By studying the life and performance degradation laws of solar cells,it is possible to predict and evaluate the on-orbit service cycle of solar cells,which can largely avoid power supply system failures in aerospace work and prevent them from occurring before they occur.One of the main reasons for the performance degradation of solar cells is the displacement damage caused by particle irradiation,which affects the lattice distribution of the battery material.Low energy protons are one of the main reasons for the displacement damage of solar cells.Firstly,a single crystal silicon solar cell model was established using PC ID software,and based on this,the effects of doping concentration,carrier lifetime,and other factors on battery performance were calculated and analyzed.Among the various parameters that affect the battery,antireflection film is an important method to improve battery efficiency and increase the radiation resistance of the battery.Therefore,five common antireflection film materials on the market were selected for coating simulation of the battery,and the impact of the five antireflection films on the efficiency and performance of the battery was analyzed.Secondly,from both micro and macro perspectives,simulation studies were conducted on the degradation of the performance of the trijunction GaAs battery under proton irradiation.A comprehensive evaluation method for proton irradiation damage of solar cells was established by combining macroscopic changes in battery performance parameters with microscopic damage mechanisms.The main work is as follows:(1)From a macro perspective,a mid cell model of a triple junction gallium arsenide battery has been established,as the performance of the triple junction battery is controlled by the sub cell that is most sensitive to radiation.Among the triple junction gallium arsenide batteries,the most sensitive is the mid cell GaAs battery.Therefore,proton irradiation analysis of the mid cell can evaluate the radiation damage of the entire triple junction battery.The equivalent circuit model method and dark current double exponential fitting method were used to fit and analyze the changes in series resistance and parallel resistance parameters of the battery after proton irradiation with different energies,in response to the electrical performance changes of the battery.Finally,the parameters of the irradiated battery were combined with the battery modeling to obtain the quantum efficiency and I-V curve of the irradiated battery.(2)Microscopically,SRIM software is based on the Monte Carlo method to simulate the interaction between particles incident on the target and calculate the relevant parameters generated by irradiation on the material.The full cascade computing mode can track the primary collision atoms generated by each incident particle.A radiation model of low energy protons incident on GaInP/GaAs/Ge trijunction batteries was established using SRIM software,ranging from 40 keV to 150 keV.The vacancy distribution caused by different protons incident on the three junction battery was obtained.Combining the displacement damage analysis method,the correlation between the energy incident on the proton and the displacement damage of the battery was analyzed.(3)Finally,the changes in macro battery performance parameters are inseparable from the micro damage mechanism.In the macro performance parameters,the battery series resistance is generally composed of the body resistance of the solar cell,the electrode conductor resistance,and the surface contact resistance of the solar cell;The parallel resistance is mainly affected by battery surface recombination and junction current.Combining the vacancy damage region in the microscopic proton irradiation model,the relationship between the changes in battery series resistance and parallel resistance and the radiation damage caused by different energy protons can be analyzed.A comprehensive evaluation method for proton irradiation was established by combining the changes in the electrical performance of macro batteries with the microscopic damage mechanism.