CsPbBr3 quantum dot assisted crystallization for high efficiency perovskite solar cells
The perovskite active layer is an important component of perovskite solar cells,and its film quali-ty affects the device performance of perovskite solar cells.In this work,we introduce a method of seed-as-sisted crystallization to prepare high quality perovskite thin films,which involves pre-introducing a small a-mount of CsPbBr3 quantum dots as seed crystals in PbI2 solution to induce bottom-up crystallization of per-ovskite and promote the formation of high-quality perovskite thin films.The results of scanning electron mi-croscopy showed that the introduction of CsPbBr3 quantum dots significantly improved the morphology of perovskite thin films,with increased grain size and disappearance of thin film pinholes.This indicates that CsPbBr3 quantum dots as seed crystals can promote the growth of perovskite thin film grains and improve the morphology of perovskite thin films.High quality perovskite thin films help reduce perovskite grain boundaries,improve light absorption performance,suppress photo generated carrier recombination,and thereby improve the photoelectric conversion performance of devices.Finally,we assembled the improved perovskite thin film into a solar cell and achieved an optimal photoelectric conversion efficiency of 20.64％,corresponding open circuit voltage of 1.08 V,short circuit current of 24.0 mA·cm-2,and fill factor of 79.64％.
CsPbBr3 quantum dotassisted crystallizationgrain boundary defectsperovskite solar cells
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