Study On Lead Halide Perovskite Solar Cells Based On Modified Carbon Electrode

Organic-inorganic metal halide perovskite solar cells(PSCs)have attracted extensive attention from researchers due to their unique absorption characteristics,low defect density,and adjustable band gap.The energy conversion efficiency has increased from 3.81%to 25.2%during these eleven years.At present,Spiro-MeOTAD materials are commonly used in hole transport layers,which are expensive and unstable.At the same time,precious metal materials as counter electrodes are not only expensive but also complicated to prepare,which is difficult to put into production on a large scale.Therefore,it is especially important to choose suitable new materials to replace precious metal counter electrodes.important.In this paper,low-cost carbon materials are used to replace precious metal electrodes.Starting from reducing costs and improving optoelectronic performance,the research focuses on electrode materials and perovskite layers.The main analysis content is the following two aspects:1.Carry out sulfonation chemical modification treatment on Carbon nanotube(CNTs).The S-CNTs material obtained after sulfonation treatment is used as a counter electrode in PSCs.The characterization methods of Steady state fluorescence spectrum(PL),Electrochemical impedance(EIS)and other characterization methods are used to briefly study the electrochemical performance of PSCs The effects of the coating thickness of the counter electrode,the annealing temperature,the annealing time and the solvent of the perovskite precursor solution on the photoelectric conversion efficiency of PSCs are discussed.It is concluded that the counter electrode of S-CNTs is more conductive than the counter electrode of CNTs,the energy conversion efficiency of the battery reaches 6.18%,which is 16.4%higher than the original counter electrode of CNTs,and the spray thickness is 1 ml/block,annealing temperature When the temperature is 100? the annealing time is 30 min,and the solvent DMF:DMSO of the perovskite precursor solution is doped in the ratio of 2:3,the performance of the battery is optimal and has good repeatability.This provides new ideas for improving the photoelectric performance of carbon counter electrode PSCs.2.Doping different concentrations of polyvinylpyrrolidone(PVP)into the perovskite precursor solution to study the optimal concentration of PVP doping and its effect on the perovskite film morphology,using X-ray diffraction(XRD),PL,EIS and other characterization methods The film quality,microstructure and electrochemical performance of PSCs were briefly studied,and the effects of perovskite film thickness and annealing time on the photoelectric conversion efficiency of PSCs were investigated.The conclusion is:when the concentration of doped PVP is 0.4 wt%,the coverage of perovskite film increases,the film is continuous and smooth,the energy conversion efficiency of the battery reaches 5.49%,which is 28.6%higher than that without PVP When the volume of the precursor solution is 100 ?l and the annealing time is 30 min,the performance of the battery is optimal and has good repeatability.Adding additives to improve the morphology of perovskite films provides new ideas for improving the photoelectric performance of PSCs.