Studies On Side-chain Modification Of Phthalocyanine/Porphyrin Complexes For Improving The Stability Of Perovskite Solar Cell

As a photovoltaic technology that can convert clean,environmentally friendly and sustainable solar energy into electrical energy,solar cells have received extensive attention in recent years.Among them,perovskite solar cells are a kind of photovoltaic devices with high conversion efficiency,easy fabrication and low cost that have developed rapidly over the past decade.However,the industrialization of perovskite solar cells still hampered by large-area fabrication,poor stability,and high lead toxicity.Therefore,this thesis mainly focuses on solving the problems in the industrialization of perovskite solar cells through molecular modification.This thesis is divided into four parts,the contents of each part are as follows:The first part mainly introduces the development history and the industrial problem of perovskite solar cells.On this basis,the role of molecular side chain modification in solving the industrial problem of perovskite solar cells is summarized,and the application of phthalocyanine and porphyrin molecules in perovskite solar cells is emphasized.In the second part,soluble phthalocyanine was prepared by modifying the flexible chain to the phthalocyanine;then,by introducing 4-tert-butylpyridine as a surfactant,a smooth and flat hole transport material was formed.the energy level of phthalocyanine can be controlled to match the energy level of perovskite.At last,the side-chain modified soluble phthalocyanines applied in large-area lead-based perovskites solar cells,and tin-based perovskites solar cells.In the third part,by modifying the peripheral side chain of the phthalocyanine ring,the effect of different substituents on the film morphology was studied.Under the condition of no additives,high-quality films were obtained,and then the device performance was regulated.Finally,the devices prepared based on undoped phthalocyanine showed excellent stability,and large-area battery devices were successfully fabricated.In the fourth part,by modifying the peripheral side chain of porphyrin ring,a porphyrin molecule with secondary amine group and sulfhydryl group was designed and synthesized,which can passivate lead defects,inhibit the migration of iodine ions,and reduce iodine-induced degradation of perovskite films.Finally,a highly efficient and stable perovskite solar cell device was realized,and the lead leakage of the device was suppressed.