Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The evolution of the dye sensitized solar cells led to the construction of the completely solution processable, so called meso-superstructured solar cell, based on lead halide perovskites as light absorbers [1]. These cells currently represent a “hot” research topic, not only for the high conversion efficiencies of around 15%, but also for the intriguing intrinsic properties of the mixed halide lead perovskites.
The electron diffusion through the CH3NH3PbI3-xClx is much faster than through the mesoporous titania, hence using a insulating scaffold such as alumina has proven to be more efficient in cell configuration [2].
However, in order to increase the low mobility of electrons and facilitate the electron transport through the mesoporous TiO2 photoelectrode, we have introduced different loadings of single wall carbon nanotubes (SWCNTs) in the fabrication of the TiO2 mesoporous electrodes. In this work we are reporting on the effects of the SWCNT loading in the TiO2 mesoporous scaffold on the parameters of the perovskite solar cells, discussing the change in the transport mechanism through the TiO2/SWCNT-perovskite interface.
We have investigated the role of the SWCNT as electron recombination centers at the absorber/scaffold interface and the impact of the Fermi level equilibration observed in the liquid electrolyte dye sensitized solar cells. We have also investigated and compared the difference in solar cell parameters, overall efficiency and electron lifetime using the open circuit voltage decay technique, between cells with different, single and mixed halide perovskites (CH3NH3PbI3 and CH3NH3PbI3-xClx) as light absorbers.
[1] Snaith, H. J. Perovskites: The Emergence of a New Era for Low-Cost, High-Efficiency Solar Cells. J. Phys. Chem. Lett. 2013, 4, 3623-3630 [2] Lee, M. M.; Teuscher, J.; Miyasaka, T.; Murakami, T. N.; Snaith, H. J. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science 2012, 338, 643-647
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