In Situ Recycling Of FTO/TiO₂ And PbI₂ In Perovskite Solar Cells

With the acceleration of human industrialization,human demand for energy is also increasing.Traditional fossil energy can no longer afford human energy demand.As we all know,traditional fossil energy not only has limited resources,but also easily produces substances harmful to the environment in the process of conversion into energy.In order to solve the problems of limited resources and the corresponding environmental problems caused by traditional fossil energy,solar photovoltaic technology has gradually entered the human vision.Perovskite photovoltaic devices have attracted the attention of many researchers because of their excellent optoelectronic properties.So far,the light conversion efficiency of perovskite photovoltaic cells has reached 25.2%,which is comparable to the light conversion efficiency of existing silicon-based solar photovoltaic cells,and is expected to become a candidate to replace silicon-based solar photovoltaic cells.Today,research on perovskite photovoltaic cells is still being carried out in an orderly manner,in order to enable it to occupy a place in the commercial market.For the future commercial modules and the device structures prepared in today's laboratories,it will eventually become a day of photovoltaic waste.In order to reduce the waste of resource costs and the environmental impact of photovoltaic waste,and in order to recycle the useful components in waste devices,this paper carried out the following work:(1)We used a simple method of DMF solution immersion to recycle the Glass/FTO/c-TiO2/m-TiO2 substrate for the mesoporous structure device.We compared the morphology and optical properties of the Glass/FTO/c-TiO2/m-TiO2 substrate before and after recycling,and found that the properties before and after recycling were very similar.The efficiency of its corresponding device was also tested,and it was found that the efficiency of the recovered device was slightly higher than that of the original device.This not only achieved the effect of recycling,and guessed that the DMF solution could optimize m-TiO2 accordingly,so that the performance of the device was improved.(2)We adopted a simple method of deionized water ultrasound to recycle and reuse Glass/FTO/c-TiO2 substrate for planar devices.By comparing the morphology and optical properties of the Glass/FTO/c-TiO2 substrate before and after recovery,it was found that the morphology before and after recovery was the same,but the optical properties changed slightly.In addition,the efficiency of the corresponding device shows that the efficiency of the recovered device is lower than that of the original device,and the difference is not very large,which is considered to be recyclable.(3)We conducted a preliminary inquiry into the in-situ recovery of PbI2.It is found that the efficiency varies greatly before and after recovery,and there are differences in the preparation of perovskite.Therefore,the recovery of PbI2 should not be considered first.