Dresden 2017 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 38: Fundamentals of Perovskite Photovoltaics V (joint session CPP/DS/HL)

CPP 38.5: Talk

Wednesday, March 22, 2017, 11:45–12:00, ZEU 250

Characterization of the perovskite solar cells containing atomic layer deposited Al₂O₃ buffer layer. — •Małgorzata Kot¹, Konrad Wojciechowski², Henry Snaith², and Dieter Schmeißer¹ — ¹BTU Cottbus-Senftenberg, Konrad-Wachsmann-Allee 17, 03046 Cottbus, Germany — ²Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX13PU, UK

Hybrid perovskites have potential to overcome performance limits of the current solar cell technologies and achieve low cost and high versatility. Nonetheless, they are prone to degradation in presence of moisture within a couple of hours or days. In this work, we use the atomic layer deposition (ALD) of Al₂O₃ on the CH₃NH₃PbI₃ perovskite at room temperature in order to verify if this thin ALD layer may protect the perovskite film against moisture degradation and to check the impact of the Al₂O₃ on the solar to power conversion efficiency (PCE). Depth profiling X-ray photoelectron spectroscopy study shows that the ALD precursors are chemically active only at the perovskite surface and the film bulk is not affected. The perovskite film coated with Al₂O₃ layer has enhanced moisture stability. Solar cells with a fresh-made CH₃NH₃PbI₃ perovskite film have shown PCE of 15.4%, while the one with 50 days aged perovskite only 6.1%. However, when the aged perovskite is covered with RT-ALD-Al₂O₃ the PCE value is clearly enhanced.[1]

[1] M. Kot et al., Room temperature ALD impact on efficiency, stability and surface properties in perovskite solar cells, ChemSusChem, acctepted.