Preparation And Photovoltaic Properties Of Polymer/Carbon Nanotube Composites

Organic solar cell has become one of the most dynamic research frontiers in the photovoltaic industry because of its simple and flexible preparation technology,low cost,light and large area made of flexible devices.However,organic solar cells have the problems of low carrier mobility,poor stability and low energy conversion efficiency,which limits the application of large-scale commercialization.Carbon nanotubes have unique molecular structure and excellent photoelectric properties.It has been found that the application of carbon nanotubes and their composites in photovoltaic devices can effectively improve the carrier mobility and trace carbon nanotubes greatly improve the performance of photovoltaic devices to improve its energy conversion efficiency.In this paper,a series of polymers and macromolecules with alcohol-soluble properties were synthesized.Then,non-covalent modification method was used to coat the polymer and macromolecules on the surface of carbon nanotubes.The long-term stability of the existence of alcohol-soluble carbon nanotube composite,and finally the performance of single-walled carbon nanotubes composite materials and its application were studied.In the second chapter,we synthesized a novel double pyrene-aminocarbazole by Suzuki polycondensation reaction:two pyrenes and amino-substituted carbazole?DPNN?.In this paper,the DPNN/SWNTs composites were obtained by non-covalently modifying single-walled carbon nanotubes?SWNTs?by DPNN molecular tweezers,and they were used as the electron transport layer in polymer solar cells.The results show that DPNN/SWNTs and ZnO bilayers are a more excellent electron transport in polymer solar cells.Compared with unmodified SWNTs,PCE is improved by nearly 53%.We found that the transport layer DPNN/SWNTs/ZnO had better alignment with the active layer P3HT:PCBM absorption spectra by absorption spectroscopy.The surface morphology of DPNN was improved by atomic force microscopy?AFM?.The surface of SWNTs modified by DPNN was more rough,which could effectively increase the interface contactarea between the transport layer and the active layer,and the electrons were transferred from the active layer to the electrode,And is effectively collected by the electrode,reducing the series resistance?Rs?value.In the third chapter,we synthesized the alcohol-soluble poly[9,9-bis?3'-?N,N-dimethylamino?propyl?-2,7-fluorene]-?9,9-dioctylfluorene?]?PFN?.The surface of SWNTs was coated by noncovalent modification method,and the PFN/SWNTs composites were dispersed and homogeneously dispersed.The morphology of the composites was studied by TEM.It was found that SWNTs were uniformly dispersed on the polymer surface in a single form.From the PFN composite before and after the absorption spectrum changes can be seen that the polymer and carbon nanotubes indicate a strong molecular role,the formation of more stable complex.The fluorescence of the complex PFN/SWNTs is weakened,indicating that there may be charge transfer between PFN and SWNTs.As a transport layer used in photovoltaic devices,greatly improving the device's photoelectric properties.In the fourth chapter,the water/alcohol-soluble Polyethyleneimide/multi-walled carbon nanotubes?PEIE/MWNTs?composites with conductive properties were prepared and used as interfacial modified layers in perovskite solar cells.The performance was excellent.Finally,we study the optimum content of PEIE and MWNTs.The results show that PEIE/MWNTs have a significant improvement in the PV performance of PEIE and MWNTs when the content of PEIE and MWNTs is about 0.1 wt.%,And the efficiency is up to about 15%,increased by nearly 21%,and the open circuit voltage Close to 1.0 V,short circuit current of more than 20 mVcm^-2,fill factor more than 70%.