Figure 5: Device stability and self-healing demonstration.
From: A polymer scaffold for self-healing perovskite solar cells
(a) PCE evolution as a function of time of perovskite solar cells with 20 or 40 mg ml−1 PEG and without PEG scaffold exposed in high humid (70% relative humidity) dark environment without any sealing. (b) Photographs of perovskite films with and without PEG showing colour change evolution after water-spraying for 60 s and kept in ambient air in 45 s. (c) J–V curves of PPSCs before and after water spray, revealing a complete recover of the cells in one minute when it puts back to ambient air. (d) X-ray diffraction evolution revealing the self-healing process: X-ray diffraction pattern of initial perovskite film with PEG, after vapour sprayed and after 10 min from removing from water vapour, respectively. The symbol ‘*’ represents for the peaks of PbI2. (e) Absorption coefficient as function of wavelength for perovskite film before and after vapour spray and self-healing.
