期刊
MATERIALS
卷 14, 期 16, 页码 -出版社
MDPI
DOI: 10.3390/ma14164594
关键词
formamidinium lead iodide perovskite; polyvinylpyrrolidone; ZnO nanorods; optical properties; electrical properties
类别
资金
- Croatian Science Foundation [HrZZ-IP-2018-01-5246]
- Centre of Excellence for Advanced Materials and Sensing Devices, Ruder Bokovi Institute, Zagreb, Croatia [KK.01.1.1.01.0001]
- European Regional Development Fund (ERDF) under the (IRI) project Improvement of solar cells and modules through research and development [KK.01.2.1.01.0115]
This paper investigated the influence of PVP stabilization additive on the optical and electrical properties of FAPI polycrystalline thin films on ZNR, demonstrating that PVP improves stability, electrical conductivity, and radiative recombination of the photogenerated charge carriers. The results show promising potential for PVP-stabilized FAPI perovskites in next-generation photovoltaic devices.
In this paper, we studied the influence of polyvinylpyrrolidone (PVP) as a stabilization additive on optical and electrical properties of perovskite formamidinium lead iodide (FAPI) polycrystalline thin films on ZnO nanorods (ZNR). FAPI (as an active layer) was deposited from a single solution on ZNR (low temperature processed electron transport layer) using a one-step method with the inclusion of an anti-solvent. The role of PVP in the formation of the active layer was investigated by scanning electron microscopy and contact angle measurements to observe the effect on morphology, while X-ray diffraction was used as a method to study the stability of the film in an ambient environment. The effect of the PVP additive on the optical and electrical properties of the perovskite thin films was studied via photoluminescence, UV-Vis measurements, and electrical impedance spectroscopy. We have demonstrated that PVP inclusion in solution-processed perovskite FAPI thin films prevents the degradation of the film in an ambient atmosphere after aging for 2 months. The inclusion of the PVP also improves the infiltration of FAPI perovskite into ZnO nanostructures, increases electrical conductivity and radiative recombination of the photo-generated charge carriers. These results show promising information for promoting PVP stabilized FAPI perovskites for the new generation of photovoltaic devices.
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