Influence Of N,S-Heterocyclic Organic Small Molecule Materials On Performance Of Perovskite Solar Cells

In today’s society,the demand for energy is increasing.On the one hand,the traditional fossil energy is facing the crisis of depletion,on the other hand,the use of a large number of fossil energy inevitably cause a large degree of environmental pollution.Therefore,the realization of efficient and clean utilization of energy is the basic requirements of people for energy development.Among the many new energy technologies,photovoltaic power generation technology,represented by solar cells,is considered to be one of the most promising new energy technologies to replace fossil energy sources.As the latest representative of photovoltaic power generation technology,perovskite solar cells have the advantages of high efficiency and low cost compared with traditional silicon-based solar cells,and have broad application prospects in the fields of flexible folding and translucent devices.However,perovskite solar cells are faced with poor stability and difficulty to regulate preparation of perovskite films.In order to solve these problems,this paper uses the heterocyclic organic small molecular material containing N,S as the dopingagent,doped in the perovskite active layer or the electronic transmission layer,in order to improve the crystallization quality of the active layer of perovskite,passivation perovskite grain boundary and interface defects,inhibit the aggregation of the electron transmission layer,improve its film forming,improve the transmission and extraction of carriers,This improves battery efficiency while improving battery stability.In this paper,the efficiency and stability of solar cells in planar heterogeneous calcium-titanium ore are studied in the following two aspects:(1)The organic small molecule piperazine containing N element was doped into the PCBM and introduced into the perovskite solar cell as an electronic transport layer.The results showed that the interaction between piperazine and PCBM slowed the aggregation of PCBM,reduced the surface roughness of PCBM film from 2.09 nm to 1.35 nm,increased the coverage of perovskite film,and the doping of piperazine increased the carrier migration rate and charge extraction ability of electron transmission layer.The average power conversion efficiency is increased from 14.10% to 15.55%,while stability is also improved.(2)The Organic Small Molecule phenothiazine(PTZ)containing N and S miscellaneous atoms is added to the perovskite film by means of anti-solvent cleaning,and the characterization of perovskite film by SEM,XRD and absorption map shows that the addition of phenothiazine makes the crystallization of perovskite thin film better,while making perovskite/PEDOTthe hole extraction and transmission can be further strengthened.Through the analysis of the defect state of the film,it is found that the film with phenothiazine doped has a lower defect state emissary degree,and the doping of phenothiazine increases the power conversion efficiency from 14.45% to15.50%,and the environmental stability of the device is also obviously improved.