| dc.description.abstract | In recent years, perovskite solar cells have developed rapidly, but there are still many problems to overcome in the commercialization. In terms of perovskite materials, they are susceptible to light and moisture, causing the degradation of perovskites, in which defects play an important role in perovskite films. How to prepare low-defect perovskite films is the focus of this article. This article will divided into two parts.
The first part is the preparation of low-defect perovskite films by spin coating process, discussing the morphology of perovskite MAPbI3 films and power conversion efficiency of solar cells under delayed annealing process. Optimize the best delay annealing condition for sixty minutes in room temperature. Then we focus on the effects after doping potassium iodide and iodine. Potassium ions can increase the crystallinity of perovskites, let absorption red shifts, reduce energy band gaps, occupy perovskite interstitial defects, and reduce defect density. The last part, iodine reacts with iodide ions in the solution to produce triiodide ions(I3-), which improves deep-level defects in perovskite films, increases electrical conductivity and carrier mobility. The champion efficiency reach 19.36 %.
The second part is the preparation of the mixed surfactant perovskite by doctor blade coating. Different concentrations of non-ionic surfactant Tween20 and Tween60 are added into the perovskite precursor solution for blade coating process. Discuss the difference in crystallization, compare the effects of two surfactants on blade coating on perovskite films and effort on performance of perovskite solar cells.
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