Application Of Magnetron Sputtering SnO₂ And CsPbBr₃ QDs In Hole-conductor-free Perovskite Solar Cells

Organic-inorganic hybrid perovskite solar cells(PSCs)are currently under hot research,andtheir photoelectric conversion efficiency has rapidly increased from the initial 3.8%to 24.2%in just a few years,which has a tendency to replace silicon-based solar cells.At present,most of the solar cells are based on high temperature sintered TiO₂,which is cumbersome and costly.On the contrary,the high carrier mobility,and the anti-ultraviolet SnO₂ is often ignored.We explored the preparation of SnO₂ electron transport layer by magnetron sputtering and applied it to PSCs based on inexpensive and stable carbon electrodes.Then,in order to solve the instability of PSCs in the atmospheric environment,we synthesized bromine lead bismuth quantum dots(CsPbBr₃ QDs)and applied them as light-absorbing layers in inorganic perovskite solar cells(PSCs).This paper focuses on the effect of magnetron sputtering on the performance of PSCs and the feasibility of applying CsPbBr₃ QDs on PSCs.The details are as follows:1.The SnO₂ film was prepared by magnetron sputtering.The thickness of SnO₂ film was controlled by different sputtering time.The effect of thickness on the performance of PSCs was investigated.The analysis of the experimental results showed that the sputtering time was controlled at 30 minutes.With the best performance,the efficiency of PSCs reaches 8.42%.2.The CsPbBr₃ QDs were prepared by hot injection method.The CsPbBr₃ QDs were treated with NH₄SCN-ethyl acetate saturated solution to solve the charge transport performance and improve the grain size.Finally,when the NH₄SCN-ethyl acetate solution was treated for 3 s,and the CsPbBr₃ QDs solution was spin-coated for 5 layers,the optimal efficiency of PSCs was2.133%.3.In order to solve the two problems of the difference between the energy level of the carbon electrode and the CsPbBr₃ QDs,and the inability to make full use of the photo-generated carriers,we synthesized the red phosphorus quantum dots(RP QDs)with moderate energy levels as the intermediate energy level.Attempts,the efficiency of the solar cell has increased to 2.721%due to the full utilization of photo-generated carriers.