Abstract
Flexible perovskite solar cells (F-PSCs) with impressive power conversion efficiency (PCE) of 13.4 % were achieved on ITO/PEN substrate, where the high quality perovskite light harvesting layer with the composition of Cs0.05(FA0.85MA0.15)0.95Pb(I0.85Br0.15)3 was achieved by the well-established anti-solvent spin-coating method in our group. The unencapsulated F-PSCs can maintain 80 % of its initial value after 150 days exposed to ambient environment, the outstanding stability was among the best shelf stability ever reported for F-PSCs. Remarkably, a model based on the single heterojunction thin film solar cell was employed to clarify the irreversible degradation mechanism of the F-PSCs based on the evolution of the essential parameters during the aging process, like the ideality factor (A), series resistance (Rs) and the reverse saturated current density (J0). Our findings shed deep insight into the degradation mechanism of F-PSCs, and favorable for rational optimizing both the efficiency and stability of perovskite-based optoelectric device.
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