Optimization Study Of Electron Transport Layer And Photoactive Layer Of Perovskite Solar Cells

Organic/inorganic hybrid perovskite-type materials,lead meta-methylamine?CH₃NH₃Pb I₃,MAPb I₃?,have attracted wide attention in the academic community because of its suitable energy band structure and low manufacturing cost.Photovoltaic cells using methyl iodide as a photoactive layer have risen from 3.8%in 2009 to 17.9%after just a few years of development.The mesoporous perovskite battery is the most common type of perovskite battery.The mesoporous layer is an important structure for separating and transporting photoelectrons,and also provides an attachment interface for the photoactive layer,which guides crystal growth during the crystallization of lead iodide.This study aims to change the morphology of the mesoporous layer,and to increase the adhesion rate with the photosensitive layer by making artificial pores,so that methyl iodide can form a better morphology when crystallized.Increase the passage of photoelectron diffusion,reduce the recombination probability of electron-hole pairs,increase the short-circuit current,and ultimately increase the device efficiency.In this paper,the self-made nano-Ti O 2 paste is doped with CTAB to reduce the agglomerate agglomeration phenomenon in the slurry,and a new method is used to add carbon nanotubes and carbon black respectively to the slurry,and the high-temperature heat treatment is used to make them.Compulsive combustion creates artificial holes in the surface of the mesoporous layer.The FESEM test shows that different doped materials form different artificial pore structures.Electrochemical tests revealed that the device efficiencies of undoped,carbon nanotube doped,and carbon black doped devices were 3.18%,3.71%,and 4.11%,respectively.The results show that devices made from carbon black have the highest efficiency.The experiment of carbon black doping ratio optimization shows that when the doping amount of carbon black is 15wt%,compared with other doping amounts,the device efficiency is the highest,which is 4.29%,and the effect is remarkable.The concentration of the lead iodide methylamine precursor solution is one of the most important factors affecting the thickness of the photosensitive layer in a one-step process.In this paper,the optimal concentration of precursor solution required to prepare the photoactive layer on the mesoporous layer with artificial pores was studied.Finally,45wt%was determined as the most suitable concentration,and the resulting device efficiency was 4.57%.Through the research in this paper,the mesopore pore structure has important influence on the device efficiency.At the same time,the main reasons for these effects are analyzed.At the same time,a preparation process for changing the pore structure of the mesoporous layer is also found,and finally the device is improved.Work efficiency.