Additive-mediated formation of large perovskite grains for efficient organometallic solar cells
발표자
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초록
내용
There are various methods to improve the PCE of perovskite solar cells, in which additive engineering is a good method to enhance the PCE by controlling the morphology, grain boundary, grain size, and density of defect states in the perovskite layer. We used a functional analog of methylammonium iodide as an additive to increase the grain boundary and grain size, it also passive the uncoordinated Pb2+ on the perovskite surface and grain boundaries. In the optimized sample with an additive high power conversion efficiency of 20.5% (18.7% for the pristine sample) was successively demonstrated. In addition, the remnant anion of analog was identified at the perovskite grain boundaries evidenced by results of time-resolved photoluminescence, in situ X-ray diffraction, and in situ UV-Visible spectroscopy measurements. Temperature dependence behaviors of the additive provide an in-depth understanding of designing and selecting additives to increase the PCE and stability of the perovskite solar cells.