Fabrication of lead iodide perovskite solar cells by incorporating zirconium, indium and zinc metal-organic frameworks

摘要

The study aimed to investigate the role of the metal-organic frameworks in the perovskite solution, and their effects on perovskite crystal, absorption, film formation, and device performance. Three supramolecular compounds of Zirconium(IV), Indium(III) and Zinc(II) with proton transfer compound, obtained from 2,6-pyridine-dicarboxylic acid and 2,6-pyridinediamine, were synthesized, and characterized and used as additives in perovskite solar cells. The additives with different amounts were added to the CH3NH3PbI3 solutions to control the morphology of the perovskite layer during the film formation process. More importantly, the metal-organic frameworks serving as additives can help to form a better perovskite layer with fewer voids between CH3NH3PbI3 domains during phase transformation. The findings showed that using a 2 wt% of zinc metal-organic framework in the perovskite layer achieved yields results in the performance of perovskite solar cells. As a result, the current density (Jsc) of the new device increased from 7.02 to 9.36 mA/cm(2), and the Fill-Factor (FF) of the device improved from 0.42 to 0.62 for 2 wt% of zinc metal-organic framework. Also, the PCE (Efficiency) of perovskite solar cells achieved more than 90% of improvement after adding 2 wt% of zinc metal-organic framework as an additive in HTM-free conditions. FE-SEM and XRD studied the morphology of this new perovskite layer.