Effect Of Soluble Metal Phthalocyanine Additives On Performance Of Perovskite Solar Cells

Organic-inorganic hybrid perovskite solar cell has become a research hotspot in recent years due to its simple structure,low-cost,and rapid development of power conversion efficiency.The most widely used active layer material is methyl iodide-lead?MAPbI₃?,which is one of the earliest,developed materials.But its poor moisture resistance and unsatisfactory thermal stability limit its practical application.Therefore,the preparation of solar devices with high photoelectric conversion efficiency,moisture resistance and thermal stability has become a key point to the commercialization of perovskite solar cells.Based on the development of the additive engineering of active layer,this work introduces a variety of copper phthalocyanines substituted with different alkyl chains as the active layer additives,which improve the performance of perovskite solar cell devices to a certain extent.The results show that the introduction of copper phthalocyanine additives increase the contact angle and improve the moisture stability of the perovskite active layer.At the same time,the addition of copper phthalocyanines also improve the thermal stability of the active layer.In addition,the introduction of copper phthalocyanines reduce the occurrence of carrier recombination.The device fabricated by the one-step spin coating method has a remarkable power conversion efficiency of 18.5%,and its water vapor resistance and thermal stability are also significantly improved.Perovskite solar cell retains 80%of initial efficiency after three weeks of storage in the atmosphere,and the rate of efficiency decay due to temperature-induced decomposition is also significantly reduced.In this study,phthalocyanine molecules,which are often used as hole transport materials,are used as additive material of perovskite layer to increase the perovskite grain size,passivate the grain boundary,reduce the hydrophilicity of the perovskite active layer,and improve its thermal stability.In addition,the addition of copper phthalocyanine acts like an interface modification layer,which is more conducive to carrier transport and reduces photo-generated carrier annihilation,thereby improving its water vapor resistance and thermal stability without reducing its device efficiency.The role of stability is beneficial to the practical application of perovskite solar cells.