Depolarization in CH3NH3PbI3 perovskite solar cells

Ivan Mora-Sero^a, Luca Bertoluzzi^a, Rafael S. Sanchez^a, Juan Bisquert^a^,^b

^aPhotovoltaic and Optoelectronic Devices Group. Physics Department., Universitat Jaume I, Catelló, 12071

^bDepartment of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah,

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Luca Bertoluzzi, presentation 228
Publication date: 5th February 2015

Standing up as a major alternative to third generation solar cells, perovskite based technologies have demonstrated high efficiencies. In spite of this, the working mechanisms of such cells are still unclear. However over the past couple of years a few new phenomena have been identified. One of the most interesting features is the giant photo induced dielectric constant at low frequency which is correlated to unusually slow decays in time transient techniques. The origin of this process is still under investigation. Yet the presence of such phenomenon is expected to have important consequences on the solar cell in working condition (steady state). The understanding of this process is therefore primordial. In this talk we will present how this polarization process can be observed and analyzed through a widely used technique: the open circuit photovoltage decay. We give a new definition of the decay time for such experiments and show how the measured decay times cannot be directly associated to the classical recombination life times defined for classical solar cells such as dye sensitized solar cell for instance. Moreover, we show that the decay time associated to depolarization of the perovskite absorber follows a stretched exponential distribution, which suggest a broad spectrum for the polarization activation times.
Power law voltage decay in perovskite solar cells shows cooperative relaxation phenomena
Juarez-Perez, E.J.; Sanchez, R.S.; Badia, L.; Garcia-Belmonte, G.; Kang, Y.S.; Mora-Sero, I.; Bisquert, J. Photoinduced Giant Dielectric Constant in Lead Halide Perovskite Solar Cells. J. Phys. Chem. Lett. 2014, 5, 2390-2394. Sanchez, R.S.; Gonzalez-Pedro, V.; Lee, J.-W.; Park, N.-G.; Kang, Y.S.; Mora-Sero, I.; Bisquert, J. Slow Dynamic Processes in Lead Halide Perovskite Solar Cells. Characteristic Times and Hysteresis. J. Phys. Chem. Lett., 2014, 5, 2357−2363. Bisquert, J.; Bertoluzzi, L.; Mora-Sero, I.; Garcia-Belmonte, G. Theory of Impedance and Capacitance Spectroscopy of Solar Cells with Dielectric Relaxation, Drift-Diffusion Transport, and Recombination. J. Phys. Chem. C 2014, 118, 18983-18991. Betoluzzi, L.; Sanchez, R. S.; Liu, L.; Lee, J.-W.; Mas-Marza, E.; Han, H.; Park, N.-G.; Mora-Sero, I.; Bisquert, J.; Depolarization Kinetics of CH3NH3PbI3 Perovskite Solar Cells. Energy Environ. Sci. 2015, DOI: 10.1039/C4EE03171G.

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