Study On Testing Parameters Of Perovskite Solar Cells Based On Different Active Layers

At present,due to the increasing frequency human production activities and the increasingly serious environmental problems,we are eagerly seeting our sights on emerging renewable energy sources.Solar energy as a clean and renewable energy has attracted our eyes,among which the research on perovskite solar cells is also increasingly in-depth.Perovskite solar cells have become one of the fastest growing projects due to their adjustable band gap,longer ion diffusion length,and higher light absorption coefficient,so far their efficiency has recently climbed to 25%.However,compared with the industrialized and mature silicon-based solar cells,there is a major challenge to accurately measure the photoelectric performance of perovskite solar cells.The hysteresis of the cell itself also brings some negative effects to the test.In order to realize the commercial application of perovskite solar cells as soon as possible,more and more researchers have begun to pay attention to the research of PSC.So we urgently need to establish a complete and accurate test system.In response to the above problems,this paper studies the testing parameters basedon different perovskite active layers of solar cells,and strives to provide some help to promote the establishment of accurate testing standards of perovskite solar cells.In this paper,we specifically studied the anion-mixed planar wide-band gap perovskite solar cell and the narrow-band gap perovskite solar cell with cation mixture,and analyzed the effects of scanning direction,delay time,scanning voltage step,illumination and temperature on the photoelectric performance of the both devices.With the different test conditions,the two types of perovskite solar cells show different performance.For wide-band gap solar cells,the efficiency of forward scanning is greater than that of backward scanning.The hysteresis increases first and then decreases with the increase of delay time.The device has the highest efficiency and the smallest hysteresis when the delay time is 30ms.With the increase of the delay time,The efficiency gradually decreases and the hysteresis decreases with the increase of the measurement step,and the device efficiency gradually raises with the increase of the measurement voltage step.For narrow band gap solar cells,the efficiency of reverse scanning is higher than that of forward scanning;as the delay time increases,the hysteresis first decreases and then increases,and the hysteresis is the smallest at 200ms,but the efficiency at 300ms is the highest.When the step size is 7mV,the hysteresis is the smallest and the efficiency is the highest.In addition,we also studied the effects of light and temperature on the two types of perovskite solar cells,and found that light and temperature in different places have a great impact on the perovskite test results,so we should keep as much as possible during the test.The stability and accuracy of the light source does not change with the ambient temperature.Through the above research,we hope to further improve the testing standards of perovskite solar cells and promote the development of perovskite solar cell research.