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DS: Fachverband Dünne Schichten

DS 11: Hybrid and Perovskite Photovoltaics I
(Joint session of CPP, DS and HL, organized by CPP)

DS 11.9: Vortrag

Montag, 7. März 2016, 17:15–17:30, H38

Humidity-induced hydration of methylammonium lead iodide perovskite: Understanding and prevention — •Yinghong Hu¹, Pablo Docampo¹, Aurélien Leguy², and Piers Barnes² — ¹Department of Chemistry, Ludwig-Maximilians-Universität, 81377 München, Germany — ²Physics Department, Imperial College, London, SW7 2AZ, United Kingdom

The long-term stability of hybrid metal halide perovskite solar cells is of paramount importance for the future of this emerging technology. In particular, solar cells composed of methylammonium lead iodide (MAPI) are notorious for their sensitivity to moisture. Here, we elucidate the humidity-induced degradation mechanisms occurring within the perovskite material and report on the development of a novel interlayer which improves the moisture stability of perovskite solar cells. Our results show that MAPI undergoes a stepwise transformation into two species of hydrated MAPI crystal phases upon exposure to moist air at room temperature. However, we show that this hydration process can be reversed when the material is subsequently dried in nitrogen. In contrast to water vapor, the presence of liquid water directly leads to the irreversible decomposition of MAPI to form lead iodide. Our developed functional moisture barrier significantly enhances the stability of the perovskite solar cells towards cycles of hydration and dehydration. We believe that our results open new possibilities for the design of moisture resistant, highly efficient perovskite solar cells.