Publication date: 1st July 2014
Organic inorganic hybrid perovskite solar cells have recently become a strong candidate for photovoltaic applications, already achieving power conversion efficiencies similar to other established thin film technologies. Their facile solution processing also makes them potential candidates as partners for conventional solar cells in a tandem device architecture. However, the bandgap of the usual perovskite structure based on methylammonium lead iodide is too narrow to be optimally used in tandem solar cells. The bandgap of this structure can be widened by exchanging some or all of the iodide ions by bromide. However, this type of material requires a mesoporous titania scaffold, which has been sintered at high temperatures to perform efficiently.[1] This eliminates them as potential candidates for a tandem configuration with conventional inorganic solar cells which are not stable at the required temperatures. In this context, we present highly efficient wide bandgap solar cells with a planar heterojunction layout. We show that this system exhibits very slow photoluminescence decay dynamics, and therefore charge diffusion lengths approaching the micron scale and power conversion efficiencies approaching 7 %.
[1] S. Ryu, J. H. Noh, N. J. Jeon, Y. C. Kim, W. S. Yang, J. W. Seo, S. I. Seok, Energy & Environmental Science 2014.
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