Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Recently, polymer additives in the precursor solution have been investigated to tune the perovskite layer formation and flexible perovskite solar cells hold great potential as a ubiquitous and low cost device. Here, we examine a series of organic polymers as scaffold for the perovskite formation. Fluoropolymers such as poly(vinylidene difluoride) (PVdF), effectively served as the scaffold to support perovskite grain interfaces, resulted in the improved cell efficiency and high bending stability.
The PVdF perovskite composite layer (MA0.17FA0.83Pb(I0.83Br0.17)3) was prepared by spin-coating the precursor solution containing 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 and the cell fabricated on PEN/ITO retained more than 80 % of the initial efficiency after 2000 bending cycles.
This work was partially supported by NEDO project, Japan.
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