10:30 AM - *ES15.11.06
Circumventing Defects in Halide Perovskite Solar Cells Through the Application of Ferroelectric Oxide Extraction Layers
Catalan Institute of Nanoscience and Nanotechnology (ICN2)1
Highly stable halide perovskite solar cells employ semiconductor oxides as electron transport materials. Defects in these oxides, such as oxygen vacancies (Ovac), act as recombination centres and, under air and UV light, reduce the stability of the solar cell. Under the same conditions, the PbZrTiO3 ferroelectric oxide employs Ovac for the creation of defect-dipoles responsible for photo-carrier separation and current transport, evading device degradation. We report the application of PbZrTiO3 as the electron extraction material in triple cation halide perovskite solar cells. The application of a bias voltage (poling) up to 2 V, under UV light, is a critical step to induce charge transport in the ferroelectric oxide. Champion cells result in power conversion efficiencies of ~ 11 % after poling. Stability analysis, carried out at 1-sun AM 1.5 G, including UV light in air for unencapsulated devices, shows negligible degradation for hours in comparison with reference solar cells applying SnO2 which degrades in only a few minutes. Our experiments indicate the effect of ferroelectricity from the PZT, however alternative conducting mechanisms affected by the accumulation of charges or the migration of ions (or the combination of them) can also be present. Our results demonstrate, for the first time, the application of a ferroelectric oxide as an electron extraction material in efficient and stable PSCs. These findings are also a step forward the development of next generation ferroelectric oxide-based electronic and optoelectronic devices.
1. Pérez-Tomas, A.; Xia, H.; Wang, Z.; Kim, H.-S.; Shirley, I.; Turren-Cruz, S.-H.; Morales-Melgares, A.; Saliba, B.; Tanenbaum, D.; Saliba, M.; Zakeeruddin, S. M.; Gratzel, M.; Hagfeldt, A.; Lira-Cantu, M., PbZrTiO3 Ferroelectric Oxide as electron extraction material in Halide Perovskite Solar Cells. Sustainable Energy & Fuels 2018, Accepted.
2. Reyna, Y.; Perez-Tomas, A.; Mingorance, A.; Lira-Cantu, M., Stability of Molecular Devices: Halide Perovskite Solar Cells. In Molecular Devices for Solar Energy Conversion and Storage, Tian, H.; Boschloo, G.; Hagfeldt, A., Eds. Springer-Verlag Berlin: Berlin, 2018; pp 477-531.
3. Pérez-Tomás, A.; Lima, A.; Billon, Q.; Shirley, I.; Catalan, G.; Lira-Cantú, M., The Solaristor concept. https://en.wikipedia.org/wiki/Solaristor. Wikipedia 2018.
4. Mingorance, A.; Xie, H.; Kim, H.-S.; Wang, Z.; Balsells, M.; Morales-Melgares, A.; Domingo, N.; Kazuteru, N.; Tress, W.; Fraxedas, J.; Vlachopoulos, N.; Hagfeldt, A.; Lira-Cantu, M., Interfacial Engineering of Metal Oxides for Highly Stable Halide Perovskite Solar Cells. Advanced Materials Interfaces 2018, 0 (0), 1800367.
5. Hagfeldt, A.; Lira-Cantu, M., Recent concepts and future opportunities for oxides in solar cells. Applied Surface Science 2018, In Press.
6. Perez-Tomas, A.; Mingorance, A.; Reyna, Y.; Lira-Cantu, M., Metal Oxides in Photovoltaics: All-Oxide, Ferroic, and Perovskite Solar Cells. In The Future of Semiconductor Oxides in Next Generation Solar Cells, 1st ed.; Lira-Cantu, M., Ed. Elsevier Singapur: 2017; p 566.
7. Lira-Cantú, M., Perovskite solar cells: Stability lies at interfaces. Nature Energy 2017, 2 (7), 17115.
8. Lira-Cantu, M., The future of semiconductor oxides in next generation solar cells. 1st ed.; Elsevier Singapur: 2017; p 566.