Efficient preparation of perovskite solar devices as well as the improvement of fill factor

【摘要】：Recently, researchers focus on simple approach to the preparation of high performance perovskite solar cell device, high performance device have a lot in previously reported article, but most of them need high temperature and evaporation method cumbersome steps, and the repeatability is not good. In this paper we report a very simple method for preparation of high efficient perovskite solar cell device. In addition to the electrode, all of our film is spin up, and get the high efficiency and almost no hysteresis of high-performance devices.In this work,we can through the comparison between different modified layer to observe influence on device performance and draw the best preparation of high-performance device. It is highly possible that the hysteresis of perovskite devices is connected with the ionic behavior of the perovskite but the detailed mechanism is not clear. Here, we find that the ionic interface charge,which is unique in perovskite devices, is linked with the hysteresis, reproducibility and working stability of the PSCs. Our best device can achieve 18.8% efficiency, and can get a great deal of FF(best 0.826), hysteresis is small in our devices, and have long service life, repeatability is very good. The simple preparation method make high performance mechanism of perovskite solar cell research more convenient. [1] [2]