Investigation On Preparation And Photoelectric Properties Of Perovskite Solar Cell

Perovskite solar cells have become one of research hot spots in solar cell field,due to its high conversion efficiency and low preparation cost.At present,many reports have involved the methods to improve conversion efficiency of perovskite solar cells,including the optimization of perovskite materials,the development of new perovskite materials,the optimization of electron transport layer and the hole transport layer,etc.In this dissertation,perovskite solar cells with structure of FTO/TiO2/CH3NH3PbI3/Spiro-OMeTAD/Au were prepared and optimized by a methylamine modified one-step spin coating.Furthermore,by studying the preparation methods and structure of different TiO2 electron transport layers,the effects of different TiO2 electron transport layers on the performance of perovskite solar cells were explored and summarized.The main contents are as follows:(1)The effect of TiO2 compact layers as electron transport layer on the properties of perovskite solar cells was studied.TiO2 compact layers were prepared by spin coating,magnetron sputtering and atomic layer deposition,respectively.The research shows that TiO2 compact layer prepared by magnetron sputtering has larger grain size and fewer grain boundaries than that TiO2 compact layers prepared by spin coating or atomic layer deposition.The FTO/TiO2 compact layer/CH3NH3PbI3 structure with TiO2 compact layer prepared by magnetron sputtering has a better light absorption property.Perovskite solar cells with TiO2 compact layer prepared by magnetron sputtering have better rectification characteristics and photoelectric conversion performance.(2)The effect of different nanostructures TiO2 on the properties of perovskite solar cells was investigated.Different structure TiO2 of nanoflower,nanotube and nanorod were prepared by hydrothermal method.The results show that nanorod TiO2 is rutile crystallline and has good order.The FTO/nanorod structure TiO2/CH3NH3PbI3 structure has better light absorption properties.Compared with nanoflower structure TiO2 and nanotube structure TiO2,nanorod structure TiO2 is better for the optimization of perovskite solar cells.(3)The different preparation techniques of nanostructured TiO2 and the effect of it as electron transport layer on perovskite solar cells were studied in detail.The morphology and structure of nanorod structure TiO2 growing on the TiO2 seed layers prepared by different processes were studied.The effects of nanorod structure TiO2 with different morphology and structure on the properties of perovskite solar cells were discussed.It is indicated that the surface roughness of TiO2 seed layer prepared by magnetron sputtering is larger,which is favorable for the growth of nanorod structure TiO2.Nanorod vertical array structure TiO2 is growing on TiO2 compact layer prepared by magnetron sputtering.The FTO/nanorod vertical array structure TiO2/CH3NH3PbI3 structure has the best light absorption properties.Perovskite solar cells with it as electron transport layer have better rectification characteristics.Compared with spin coating method and atomic layer deposition process,TiO2 seed layer prepared by the magnetron sputtering process can grow TiO2 nanorod structure of vertical array,and perovskite solar cells with it have the best performance.