Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Recently, polymer additives in the precursor solution have been investigated to tune the perovskite layer formation. For example, poly(ethylene glycol) was reported as a scaffold of the perovskite layer formation [1]. Here, we examine a series of organic polymers as scaffolds for the perovskite formation. Fluoropolymers such as ferroelectric poly(vinylidene difluoride) (PVdF), effectively served as the scaffolds to support perovskite grain interfaces, resulted in the improved cell efficiency.
The PVdF perovskite composite layer (MA0.17FA0.83Pb(I0.83Br0.17)3) was prepared by spin-coating the precursor solution containing 0.1-3 wt% PVdF. STEM-EDX analysis of the cross-sectional layer showed that PVdF supported the perovskite grains and acted like a binder between the grains. Photovoltaic performance of the cell fabricated with the PVdF-perovskite layer was rather improved with the increase in short circuit current density, which was also verified by the enhanced current flow in conductive-AFM study. Kelvin Probe Force Microscopy (KPFM) revealed the charge accumulation in the light irradiation.
Reference
[1] Q. Zhao, et al., Nature Commun. 2016, 7, 10228.
Acknowledgement
This work was partially supported by NEDO project, Japan.
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