Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
In this study, we present a method for mixed-ion (FAPbI3)1-x(MAPbBr3)x perovskite preparation under ambient conditions following a procedure similar to that described by Correa-Baena et al,[1] but with an additional substrate heating step to obtain uniform perovskite films. We compared the effect of different substrate heating temperatures on the formation of the perovskite layer. The best solar cell efficiencies were obtained with substrates heated at 50°C. When the perovskite pre-cursor solution was spin-coated on the warm mesoporous titanium dioxide substrates, and an anti-solvent injected during the spin-coating cycle, a uniform red intermediate film was obtained. We found out that the presence of the red film was crucial for obtaining high efficiency solar cells. An unwanted crystallization occurred on the surface of the red intermediate film if it was not annealed directly, which affected the performance of photovoltaic devices negatively. The formation of the unwanted crystals is believed to cause an uneven compositional distribution and largely impede the formation of the perovskite material. We seek to explain the composition of the red intermediate phase, to elucidate what effect it has on the formation of the perovskite layer and the performance of the resulting solar cells.
References:
[1] J. P. C. Baena, L. Steier, W. Tress, M. Saliba, S. Neutzner, T. Matsui, F. Giordano, T. J. Jacobsson, A. R. S. Kandada, S. M. Zakeeruddin, A. Petrozza, A. Abate, M. K. Nazeeruddin, M. Grätzel and A. Hagfeldt, Energy Environ. Sci., 2015, 8, 2928–2934.
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