engleski

Perovskite solar cells; perovskite material stabilization by additives and influence on photovoltaic performance

Organometal lead hailde perovskite materials have shown promising properties as active layers for use in photovoltaic devices. However, the stability in ambient environment still remains a challenge due to the perovskite degradation in contact with water molecules. We have studied formamidinium lead iodide (FAPI) perovskites stabilized by polyvinylpyrrolidone (PVP). Its influence on structural stability, morphology, optical and electrical properties of perovskite thin films, as well as at the photovoltaic performances was investigated. FAPI was deposited from a single solution on the electron transport layer using a one-step method. The influence of PVP on layer's morphology was explored by SEM, while XRD was used to track stability of the film in ambient environment. The optical and electrical properties was examined using photoluminescence (PL), UV-Vis and impedance spectroscopy (IS), while photovoltaic performances were studied by I-V measurements. We have demonstrated that PVP inclusion in FAPI, prevents the degradation of the film in the ambient atmosphere after ageing for 2 months. PL and UV-Vis measurements indicated less structural defects in the films with PVP, while IS indicated higher electrical conductivity. The performances of photovoltaic devices were studied and discussed in correlation with structure and stability of perovskite active layer.

perovskite solar cells ; formamidinium lead iodide ; polyvinylpyrrolidone ; optical properties ; electrical properties

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