Humidity versus photo-stability of metal halide perovskite films in a polymer matrix

摘要: Despite the high efficiency of over 21% reported for emerging thin film perovskite solar cells, one key issues prior to their commercial deployment is attain long term stability under ambient and outdoor conditions. The instability in widely conceived be humidity induced due water solubility its initial precursors, which leads decomposition crystal structure; however, we note that alone not major degradation factor it rather photon dose combination with exposure triggers instability. In our experiment, designed decouple effect light on degradation, investigate shelf-lifetime CH3NH3PbI3 films dark illumination conditions (Rel. H. > 70%). We minor stored a humid environment whereas upon light, undergo drastic primarily owing reactive TiO2/perovskite interface also surface defects TiO2. To enhance air-stability, incorporate polymer (poly-vinylpyrrolidone, PVP) matrix retained optical structural characteristics ∼2000 h ∼800 room soaking, significantly higher than pristine film, degraded completely 600 less 100 when exposed light. attribute superior PVP incorporated improved incorporating matrix. Charge injection from embedded has been confirmed by fabricating cells using them, thereby providing promising future research pathway stable efficient cells.