Physical properties and photostability of 3D and 2D Ruddlesden-Popper perovskite materials for photovoltaic applications
Résumé
Solution-processed organometallic perovskite based solar cells have emerged as a promising thin-film photovoltaic technology. There have been few reports on the photo-stability of such devices, attributing the hysteresis and performance degradation to various phenomena, including photo-degradation and fast self-healing of the photocurrent in large grain perovskite solar cells of the 3D methyl ammonium (MA) lead iodide materials under constant illumination. The polaronic picture proposed recently is related to contributions from both the inorganic and the organic parts of the material. Layered perovskites obtained by the same growth procedure recently report a record photovoltaic efficiency of 12.52 % with no hysteresis, more than two times higher than previously reported values. Intrinsic quantum and dielectric carrier confinements, and protection afforded by the organic inner barriers in the 2D Ruddlesden-Popper phases, may explain their exceptional photostability under standard illumination as well as humidity resistance over 2000 hours.
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