235 / 2022-02-15 17:10:24

Reducing defect of Perovskite Solar Cells By a peptide organic molecules

Perovskite solar cells, Interface modification, Charge extraction, Peptide Organic Molecules

（7）矿物与先进能源材料 > 8. 新型能源材料

The use of molecular modulators to passivate the defect density at the surface and grain boundaries of perovskite films had been demonstrated to be an effective strategy which was used to minimize nonradiative recombination losses in perovskite solar cells. Herein, we use a polypeptide molecule (Fmoc-FKFKFKFK-NH₂) composed of multiple amino acid molecules to passivate the defects between the nickel oxide and perovskite layer. Experimental results confirmed that Pb^- cluster and Pb-I defects can be effectively passivated by amino and carbony group bonding with the Pb²⁺ on the perovskite surface, leading to a significantly suppressed non-radiative recombination. As a result, the power conversion efficiency (PCE) increased from 12.16% to 15.14%, mainly due to the passivation of defects at the interface and grain boundary, which can obtain higher short-circuit current and fill factor. Furthermore, the Fmoc-FKFKFKFK-NH₂ treated perovskite device shows better long-term environmental stability. Our work reveals an effective method to use rationally designed peptide molecules to simultaneously enhance device performance and stability.