Preparation And Properties Of Charge Carrier Transport Materials For Organic-Inorganic Hybrid Perovskite Solar Cells

As a kind of sustainable development energy device,Solar cells have been vigorously developed due to their low fabrication,low pollution and high efficiency properties.The power conversion efficiency?PCE?has surpass 20%from 3.8%in2009.In this paper,the effects of the carrier transport materials on the performance of the perovskite solar cells was researched.?1?TiO₂ nanorod arrays?TIO₂-NAs?were modified by CuInS₂ quantum dots?CuInS₂ QDs?on the surface of the nanorods.The resultant core-shell type TiO₂-CuInS₂ nanorodarrays?TiO₂-CuInS₂-NAs?were characterized by UV/Vis spectroscopy,transmission electronic microscopy?TEM?,and X-ray diffraction?XRD?.The TiO₂-CuInS₂-NAs were applied as electron transporting materials?ETMs?for organic-inorganic hybrid perovskite solar cells.In comparison with the solar cell devices based on TIO₂-NAs,a significant improvement in the power conversion efficiency had been achieved and the highest efficiency was obtained as 11.7%?under100 mW/cm²?through the optimization of the growth time of QDs on nanorods.The steady-state and time-resolved photoluminescence spectroscopic studies gave further insight into the charge transfer between the perovskite and ETLs and indicated charge transfer was facilitated for the CuInS₂ QD-modified TiO₂nanorods.?2?The introduction of new organic or inorganic semiconductor materials to improve the structure of the electron transport layer is one of the important ways to improve the perovskite solar cells.In this paper,for the first time,to the best of our knowledge,we synthesized a novel Graphene-CuInSe₂ composite by using one step solvent heat reaction meathod.Based on the characterization of the composites,the growth process of CuInSe₂ NPs on graphene films was successfully analyzed and the growth mechanism of the composite was proposed.The composite was applied as the electron transport layer material to directly form the film by blending with the perovskite material,and the device without TiO₂ ETM layer is prepared where a excellent device performance was obtained.This results confirm that the Graphene-CuInSe₂ composite synthesized in our experimental is a promising photovoltaic material.?3?The Absorption spectra of the CH₃NH₃PbI₃ material is main at 400-600 nm,which produces a low device PCE.Here,we synthesized a novel organic Benzo-BODIPY material,showing strong absorption property at region from 600-700nm,which remedys the shortcomings of CH₃NH₃PbI₃ absorption at 600-700 nm.We applied this Benzo-BODIPY material as hole transport layer in the CH₃NH₃PbI₃ solar cell and obtained excellent performance.After that,we fabricated a kind of device where the light harvest layer consists of the Benzo-BODIPY and CH₃NH₃PbI₃.As expected,an improved PCE was obtained compared with the pure CH₃NH₃PbI₃ solar cell.Besides,we optimized device performance surpass to 15%by controlling the annealing time,annealing temperature and so on.