Research On Performance Optimization Based On P3HT:PC₆₁BM Polymer Solar Cells

Recently,polymerc solar cells?PSCs?have been increasingly attracted huge attention due to its superior performance,such as cost-effective,less toxic,low procession temperatures,light weight and mechanical flexibility.Howere,the thickness of uncoordinated light-absorbing layer and power conversion energy of the cells were severely restricted due to the short exciton diffusion length and low carrier mobility of most conjugated polymers materials,which became the bottleneck for further developmen.Therefore,it becomes crucial to find ways to boost light absorption in the active layer.The work of this thesis choose P3HT:PC₆₁BM as active layer to optimize the performance of the polymer solar cell by enhancing the light absorption.Noble metal silver nanoparticles with surface plasmon resonance effect and and fluorescent carbon quantum dots were designed to improve light absorbtion of active layer by increasing the optical path length and effective light conversion in the device.In this thesis,the development history and research status of polymer solar cells are reviewed,and the principle and the parameters affecting the performance of the devices are also analyzed.The performance of polymer solar cell with the structure of ITO/PEDOT:PSS/P3HT:PC₆₁BM/Al was studied in detail.The noble metal silver nanospheres were fabricated by hydrothermal method,which were embedded between the anode buffer layer and active layer of devices by doping method.The photoelectric performance on this material was measured systematically.The results show that there is a greatly improved in the light absorption of the active layer,the maximum exciton generation rate,the excitons dissociation efficiency and the hole mobility.The alcohol-soluble zirconium acetylacetonate?ZrAcac?was spin-coated as the electron transport material to fabricate a polymer solar cell with the device structure of ITO/PEDOT:PSS/P3HT:PC₆₁BM/Zr Acac/Al,and its photoelectric performance was measured.The results show that ZrAcac film facilitates the extraction of electrons and effectively improves the photocurrent and fill factor of the device.It is an ideal cathode modification layer material.The alcohol-soluble fluorescent nanomaterial carbon quantum dots?CQDs?were prepared by microwave method,and the material was incorporated in different interface layer of P3HT:PC₆₁BM-based polymer solar cells by spin coating method.The photoelectric performance on this material was measured systematically.The results show that the incorporation of CQDs into a polymer solar cell can effectively use more incident light,increasing the photocurrent of the device and improving performance of the device.