Study On Performance Optimization Of Perovskite Solar Cells Via Interface Engineering

In recent years,a new type of solar cell with perovskite as absorption optical materials developed very rapidly.Perovskite refers to a family of organic-inorganic hybrid materials owning the perovskite crystal structure.Perovskite solar cell based on organic metal halide quickly becomes a hot research topic in the whole world due to extremely excellent properties of perovskite.In addition to the perovskite light absorption layer,the surface/interface becomes an important influence factor of the power conversion efficiency?PCE?in the perovskite solar cells prepared by solution method.In this paper,we utilize interface engineering to reduce carrier trapping and recombination at the composite interface,expecting to improve the collection efficiency of carriers and the performance of perovskite solar cells.The main contents of this thesis include: firstly,via the technology optimization of solar cell,we prepare conventional and inverted structure planar heterojunction perovskite solar cells and comprehensively analyze different manufacturing process of perovskite photoactive layer.At the same time,we study the effects of process parameters of the perovskite active layer on performance of inverted planar heterojunction solar cell.Secondly,we optimize the process conditions of perovskite solar cell based on [6,6]-phenyl-C61-butyric acid methyl ester(PC₆₁BM)as the electron transport layer and improve the quality and morphology of the PC₆₁ BM electron transport layer via interface engineering.Then we introduce 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline?BCP?as the hole blocking layer into the device and enhance the device performance by optimizing the BCP's forming process and inhibiting the carrier accumulation and recombination at the interface of PC₆₁ BM and cathode.The corresponding short-circuit current density,open-circuit voltage,fill factor and PCE reach 18.1 m A cm^-2,0.83 V,72.1% and 10.9%.Finally,we introduce 5,6,11,12-tetraphenylnaphthacene?rubrene?as the hole transporting layer and fabricate the perovskite solar cell.The performance of the device increases again due to high hole mobility and matched energy level of rubrene with those of the perovskite light absorption layer.Through the rational analysis on the defects in the cell,we design a perovskite solar cell using the poly?3,4-ethylene-dioxythiophene?:poly?4-styrenesulfonate??PEDOT:PSS?/rubrene bilayer as the hole transport layer,realizing a short-circuit current density,an open-circuit voltage,a fill factor and a PCE of 22.2 m A cm^-2,0.86 V,74.9% and 14.4% by optimizing thickness and manufacturing process of PEDOT:PSS/rubrene bilayer.