Abstract
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)I6]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)I6]4- octahedron structure and inhibiting ion migration, separately. This work has proposed a novel theory for magnetic field action influencing the performance of magnetic ions doped perovskite solar cells and offered a new idea for preparing cells with improved performance, which is helpful to facilitate the commercialization of perovskite solar cells.
NSTL
Elsevier