Study On Radiation Tolerance Of MA/FA/Cs Ternary Cation Perovskite Solar Cells

Organic-inorganic hybrid perovskite solar cells(PSCs)have attracted extensive attention in recent years due to their excellent photovoltaic performance.At present,the power conversion efficiency(PCE)of PSCs is developing rapidly,and has reached 25.2%.However,the stability of PSCs remains to be further explored and improved.As the new generation of the most promising solar cells,PSCs require more detailed exploration for their wide application in aerospace.The space environment in which the spacecraft operates is very complex,and various high-energy particles and rays can cause radiation damage to the devices therein,performance degradation,and even device destruction.Since solar cells are directly exposed to the space environment in space applications,they will be affected by the radiation environment from space,thus destroying the normal operation of spacecraft in orbit.Therefore,it is necessary to study the radiation tolerance of PSCs.The main research contents are as follows:(1)MA/FA/Cs ternary cation perovskite thin films were prepared by two-step method.The structural and optical properties of perovskite thin films were studied by XRD,SEM and UV-vis.The further preparation of MA/FA/Cs ternary cation PSCs shows that the PCE is 19.03%,and the short circuit current density(Jsc)is 24.04 mA·cm-2.After that,the external quantum efficiency(EQE)is mostly between 80%and 90%.The integrated current density is very close to the Jsc of the test device,which proves that the device has good performance.(2)The irradiation tolerance test of glass-based MA/FA/Cs ternary cation PSCs with 60Co-? ray was carried out at a maximum dose of 500 krad(Si),and the Jsc and PCE of the irradiated device decreased.In order to analyze the specific causes of damage,PSCs were analyzed layer by layer.The results show that the phase transformation of perovskite films occurs after irradiation,and the absorption properties of perovskite films are further reduced by testing the absorption strength of perovskite films.This phenomenon indicates that perovskite layers are damaged by irradiation.The glass substrate showed a coloring phenomenon after irradiation,and the color gradually deepened as the dose was increased.Subsequently,the decrease in transmittance confirmed this phenomenon.Therefore,the radiation damage of PSCs is caused by the phase transformation of perovskite layer and the coloration of glass substrates.(3)In view of the radiation damage of glass-based PSCs under 60Co-y ray,effective measures are proposed to improve the sensitive parts of irradiation.Therefore,the radiation effect of flexible PSCs under 60Co-y ray is discussed.The flexible perovskite film was prepared by adding a certain proportion of DMSO solvent in order to make the film smoother and more stable.The substrates of devices are replaced by flexible PEN substrates instead of glass substrates.On the one hand,in order to reduce the size of devices,on the other hand,to avoid the coloring phenomenon after glass irradiation.The Jsc and PCE of flexible PSCs are still reduced under 60Co-? ray irradiation.However,compared with glass-based PSCs,it has higher radiation tolerance.