The Study Of Solar Cells Based On Quasi-two Dimensional Perovskite?PEA?₂?MA?₄pb₅I₁₆

Organic/inorganic hybrid perovskite materials are widely used in photovoltaic devices such as solar cells due to their excellent photoelectric properties.Since the invention of perovskite solar cell in 2009,its efficiency has jumped from the original 3.8% to the current 25.2%,which shows promising prospect.However,the stability of normal perovskite solar cells is very poor.In order to solve the stability problem,two-dimensional materials have attracted people's attention.It might replace traditional three-dimensional perovskite to solve the problem of poor stability of perovskite solar cells well.After several years of development,there have been many methods to improve the peroformance of quasi-two-dimensional perovskite solar cells,but their efficiency is still much lower than that of traditional solar cells,and the research on the internal work mechanism of quasi-two-dimensional perovskite solar cells is very limited.In this paper,the behavior of the carrier transport and recombination happening in quasi-two-dimensional perovskite solar cell is studied by transient test methods,and some advantages of quasi-two-dimensional perovskite are analyzed.The performance of quasi-two-dimensional perovskite based devices is improved by means of interface modification.The main research contents of this paper are as follows:(1)Through the transient photocurrent,transient voltage light and residual charge test method,we studied the internal carrier behaviors of device.Our results show that the of the solar cell based on quasi-2D perovskite is 0.33 ?s and s is 11.20 ?s,while the photocurrent decay time and the lifetime of carrier are 0.47 ?s,carrier's lifetime is 5.81 ?s for three dimensional perovskite device,respectively,indicating that quasi-2D perovskite solar cells have faster carrier transport,higher extraction efficiency and less internal defects compared with 3D perovskite solar cells.(2)The quasi-2D perovskite film was treated with PEABr solution for the sake of improving the quality of perovskite film and enhancing carrier transport.Through PEABr interface modification,we improved the device performance of quasi-2D perovskite solar cell.When the concentration of PEABr solution is 2 mg/m L,the quasi-2D perovskite solar cell achieves its best performanceand the increases in short-circuit current and PCE are 11.5% and 20.7%,respectively.