Effects of Co2+doping and magnetic field actions on the stability and efficiency of perovskite solar cells and their mechanisms

To improve the cell performance, CH3NH3PbI3 film prepared via a two-step method in air was modified by Co2+ doping and magnetic field action. Effects of Co2+ doping and magnetic field strength on film properties and cell performance were investigated. Possible influence mechanisms of Co2+ doping and magnetic field strength on perovskite structure, film properties and cell performance were studied. Results show that Pb in CH3NH3PbI3 was partially replaced by 10% Co, and Co2+ doped device exhibits ameliorative stabilities and efficiency compared with undoped one due to the more stable [Pb(Co)I-6](4-) octahedron structure and the suppression of ion migration, respectively. Then, weak magnetic field action furtherly improves stability and efficiency of CH3NH3Pb0.9Co0.1I3 based cell by furtherly stabilizing [Pb(Co)I-6](4)(-) octahedron structure and inhibiting ion migration, separately. This work has proposed a novel theory for magnetic field action in-fluencing the performance of magnetic ions doped perovskite solar cells and offered a new idea for pre-paring cells with improved performance, which is helpful to facilitate the commercialization of perovskite solar cells. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The performance of CH3NH3PbI3 film was improved through Co2+ doping and magnetic field action, leading to enhanced stability and efficiency of the solar cells. This study proposed a novel theory for the influence of magnetic field action on perovskite solar cells doped with magnetic ions, offering a new idea for preparing cells with improved performance.