Towards Enhancing Stability of Perovskite Solar Cells

Fabio Matteocci^a, Aldo Di Carlo^a, Surendra k. Yadav^a, Narges Yaghoobiniya^a, Alessandro L. Palma^a, Desiree Gentilini^a

^aUniversity of Rome (Tor Vergata), Via del Politecnico, 1, Roma, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Surendra k. Yadav, 347
Publication date: 5th February 2015

The perovskite, (methyl ammonium lead tri-iodide, CH₃NH₃PbI₃) organic inorganic hybrid solar cells are recently getting considerable interest among the researchers in the field for the basis of their high photo conversion efficiency (PCE). The lead halide are the material equipped with absorber of broad range of radiation and ambipolar charge transport characteristics. The research focus on to enhance the PCE, but the poor stability on a longer time scale is a greatest disadvantage of such systems. There are several parameters that affect the performance and stability of perovskite solar cells such as mesoporous layer thickness, structure of perovskite crystal, crystallite size, surface roughness, hole transporting layer surface coverage etc. The stability issues are discussed in various paper literatures ^{1, 2}. The major weakness of the lead halide perovskite is their inherent vulnerability to moisture and heat. Here we demonstrate the systematic study of shielding effect on thermal stress and light soaking on various interlayers of perovskite solar cell, which contains mesoporous TiO₂ on FTO, CH₃NH₃PbI₃ and Spiro-OMeTAD as scaffold, absorber and hole transporting layer (HTL) respectively. We subjected cells to thermal stress at 85˚C, 50˚C, room temperature and light soaking in order to identify degradation of specific interlayer materials in both encapsulated and non-encapsulated devices with or without HTL. The result contains IV, X-ray diffraction, UV-visible absorption and IPCE measurements of perovskite solar cells within the time line of degradation process to identify the main roots of failure. Acknowledgement:The research leading to these results has received funding from the European Union Seventh Framework Program [FP7/2007- 2013] under Grant Agreement 316494.
UV-visible spectra of perovskite layer on TiO2, under thermal stress and considered device architecture for experiments.
1. Burschka, J.; Pellet, N.; Moon, S.-J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Grätzel, M. Sequential deposition as a route to high-performance perovskite-sensitized solar cells, Nature 2013, 499, 316–319. 2. Habisreutinger, S. N.; Leijtens,T.; Eperon, G. E.; Stranks, S. D.; Nicholas, R. J.; Snaith, H. J. Carbon nanotube/polymer composites as a highly stable hole collection layer in perovskite solar cells, Nano Lett.2014, 14, 5561−5568.

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