Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Methylamonnium lead (II) triiodide has arised along the last years as one of the most promising materials in the field of photovoltaics. Efficiencies of more than 20% have been achieved very quickly. [1] Nevertheless, MeNH3PbI3 shows stability issues against several agents -moisture, UV light, temperature- that need to be addressed. [2] Recently, related lead perovskites where the methylamonnium cation has been replaced by formamidinium (FA) are becoming popular. Formamidinium lead triiodides show improved stability when exposed to ambient conditions. In the context of photovoltaic applications, formamidinium-containing lead perovskites have shown excellent efficiencies, the record being at the moment 20.8%. [3,4] Oxygen has been previously identified as an important degradation pathway in methylamonnium lead triiodide perovskite film, with results pointing to the organic cation as the starting point of the mechanism. [5,6] In this poster, we take an insight on the influence of the organic cation on the stability of lead (II) perovskite films. For that purpose, we studied samples of methylamonnium and formamidinium lead iodide perovskites fabricated on glass. The results point to the acidity of the protons in the organic cation as the limiting factor in the degradation pathway triggered by oxygen and light.
[1] N. J. Jeon, J. H. Noh, W.S. Yang, Y. C. Kim, S. Ryu, J. Seo, S. I. Seok, Nature, 2015, 517, 476-480.
[2] X. Zhao, N-G. Park, Photonics, 2015, 2(4), 1139-1151
[3] D. P. McMeekin, G. Sadoughi, W. Rehman, G. E. Eperon, M. Saliba, M. T. Horantner, A. Haghighirad, N. Sakai, L. Korte, B. Rech, M. B. Johnston, L. Herz, H. J. Snaith, Science, 2016, 135, 6269, 151-155.
[4] D. Bi, W. Tress, M. I. Dar, P. Gao, J. Luo, C. Renevier, K. Schenk, A. Abate, F. Giordano, J.-P. Correa-Baena, J.-D. Decoppet, S. M. Zakeeruddin, M. K. Nazeeruddin, M. Gratzel, A. Hagfeldt, Science Advances, 2016, 2 (1), e1501170
[5] Flannan T. F. O’Mahony, Yong Hui Lee, Cameron Jellet, Stoichko Dmitrov, Daniel T. J. Bryant, James R. Durrant, Brian C. O’Regan Michael Graetzel, Mohammad K. Nazeeruddin, and Saif A. Haque Journal of Materials Chemistry A 3, 7219-7223 (2015)
[6] N. Aristidou, I. Sanchez-Molina, T. Chotchuangchutchaval, M. Brown, L. Martinez, T. Rath and S. A. Haque Angewandte Chemie International Edition 54, 8208-8212 (2015)
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