Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Perovskite solar cells have experienced the fastest efficiency improvement ever observed for any kind of photovoltaic technology. 15-16 % efficiencies have been recently reported.1-4 Despites the fast development of this technology the working principles of these cells are not completely understood. There are clear evidences that the working mechanism governing this kind of cells presents visible differences respect other photovoltaic devices.5 Here we present a systematic study of different perovskite configurations with and without mesoporous scaffold, with different perovskite types, CH3NH3PbI3 and CH3NH3PbI3-xClx, and with different selective contacts. Impedance spectroscopy (IS) characterization has been carried out, under dark and under illumination conditions. We shown that this characterization allows to determine sample conductivity and diffusion length. Similar patterns have been obtained regardless perovskite material and cell configuration, pointing to similar working principles in perovskite solar cells. In addition the role of selective contact is also discussed comparing samples with an without electron and/or hole selective contacts. Effect of selective contact in cell performance in terms of fill factor and open circuit voltage are highlighted, observing a dramatic effect of selective contacts in recombination rate.
1. Burschka, J.; Pellet, N.; Moon, S.-J.; Humphry-Baker, R.; Gao, P.; Nazeeruddin, M. K.; Gratzel, M., Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature 2013, 499, 316-319. 2. Liu, M.; Johnston, M. B.; Snaith, H. J., Efficient planar heterojunction perovskite solar cells by vapour deposition. Nature 2013, 501, 395-398. 3. Wang, J. T.-W.; Ball, J. M.; Barea, E. M.; Abate, A.; Alexander-Webber, J. A.; Huang, J.; Saliba, M.; Mora-Sero, I.; Bisquert, J.; Snaith, H. J.; Nicolas, R. J., Low-temperature processed electron collection layers of Graphene/TiO2 nanocomposites in thin film perovskite solar cells. Nano Letters 2013. 4. Liu, D.; Kelly, T. L., Perovskite solar cells with a planar heterojunction structure prepared using room-temperature solution processing techniques. Nat Photon 2013, advance online publication. 5. Kim, H.-S.; Mora-Sero, I.; Gonzalez-Pedro, V.; Fabregat-Santiago, F.; Juarez-Perez, E. J.; Park, N.-G.; Bisquert, J., Mechanism of carrier accumulation in perovskite thin-absorber solar cells. Nature Communications 2013, 4:2242 doi: 10.1038/ncomms3242.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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