NH3+-Functionalized PAMAM Dendrimers Enhancing Power Conversion Efficiency and Stability of Perovskite Solar Cells
The introduction of polymer additives provides a simple effective method to modify perovskite grain boundaries to improve power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). In this work, the high-quality methylammonium lead triiodide (MAPbI 3 ) perovskite film is prepared by adding the protonated polyamide-amine dendrimer (NH 3 + -PAMAM) to the perovskite precursor solution to regulate the crystalline growth process. The cross-linked perovskite grain structure induced by dendritic NH 3 + -functionalized PAMAM macromolecules results in the formation of compact and pinhole-free perovskite film owing to the suppression of perovskite gain boundaries. Finally, the unsealed NH 3 + -PAMAM modified PSC device achieves the highest PCE value of 16.03%, representing an increase of 48% compared with the control PSC device. Also, the unencapsulated NH 3 + -PAMAM-modified PSC device retained 75% of initial PCE value after being exposed to an ambient environment for 20 days, which is obviously higher than 10% for the control device. The improvements of perovskite morphology and photovoltaic performance are attributed to the modification of NH 3 + -PAMAM dendrimers. Graphic abstract
危险品化学品经营许可证（带存储）