The Study On Photoelectric Properties Of Perovskite Solar Cells With Carbon Electrode

With the progress of industrialization of human society,the demand for energy is increasing day by day,which is in great contradiction with the increasingly barren energy reserve.For this reason,the fate of each country in the future depends on the control of energy,and the development of new energy has become the top priority of all tasks.Among them,solar energy has become a black horse in the field of new energy because of its advantages of easy collection and huge reserves.Therefore,the research on solar energy utilization has become a hot spot in the scientific research direction,among which the research on organic-inorganic hybrid perovskite solar cells is one of these hot spots.Since the first titanium solar cell was reported in 2009,its photoelectric conversion efficiency has increased to more than six times of the initial efficiency,exceeding that of thin film solar cells and approaching that of crystalline silicon solar cells.The excellent properties of perovskite can be attributed to its high optical absorption coefficient,high carrier mobility,long carrier diffusion length and low exciton binding energy.Despite the fruitful research on perovskite solar cells,there are still some problems hindering their practical application in the future.For example,one of the serious problems is that most of the cells prepared in the laboratory are prepared by vacuum high temperature evaporation of precious metals,which greatly increases the cost of production and can not achieve a larger area of cell preparation,making its future commercial road tortuous and long.In addition to Au and Ag,there are other materials used in the study as counter electrodes for cells,such as MoO₃/Al composite materials,metal Ni and some carbon materials.Among them,carbon materials have low price,stable physical and chemical properties,and are suitable for use as the counter electrodes for cells.In the preparation of carbon electrodes,scraping and screen printing are usually used,which is of great practical significance for the preparation of large area devices.However,there is serious charge recombination at the interface between perovskite and carbon electrode,which results in poor performance of carbon-based holeless perovskite solar cells.Based on this,we explored how to improve the extraction and transmission of photogenerated carriers in perovskite solar cells with carbon electrodes,and fabricated high-quality battery devices,which significantly improved the photoelectric performance of the cells.The following is the research content of this paper.NiO nanoparticles were used as the hole transport layer of perovskite solar energy with carbon electrodes to fabricate efficient and stable cells.The results show that adding NiO nanoparticles between perovskite film and carbon electrode can effectively improve the hole extraction and transmission performance of the cell,promote the separation of photogenerated carriers,inhibit the charge recombination between perovskite absorbing layer and carbon electrode interface,and then improve the photoelectric performance of the cell.Finally,by optimizing the concentration of NiO nanoparticles,stable cells with photoelectric conversion efficiency of 13.6%were fabricated.Compared with the batch of cells without NiO,the efficiency increased by 27%.