MAPbBr3 Perovskite Prepared by Halide Exchange
Ivan Mora-Sero a, Eva M. Barea a, Rafael S. Sanchez a, Bruno Clasen Hames a, Marta Valles-Pelarda a, Eya Belarbi a b, Hager Maghraoui-Meherzi b
a Université de Tunis El-Manar, Campus Universitaire de Tunis El-Manar 2092, Tunis
nanoGe Perovskite Conferences
Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
València, Spain, 2017 March 1st - 2nd
Organizers: Henk Bolink and David Cahen
Poster, Marta Valles-Pelarda, 017
Publication date: 18th December 2016

In the last few years, hybrid halide perovskites have awakened interest due to their great properties for the development of photovoltaic devices. On the other hand, these materials present uncommon properties compared with other photovoltaic materials as a fast ionic diffusion coefficient. In order to benefit from this property in the growth of the perovskite and to control the morphological and optoelectronic properties, we report a two-step deposition method involving not just organic cation migration but anion migration. In this work, methylammonium lead bromide (MAPbBr3) film is formed after dipping separately three different lead salts (PbI2, PbBr2, PbCl2) in a MABr solution. This method results in films with different morphological and optoelectronic properties depending on the initial lead halide salt and also produces different performances of the photovoltaic devices. On one hand, in the devices prepared using PbI2 and PbCl2 salts the charge recombination is reduced and so they have a higher open circuit potential, especially with PbI2. On the other hand, the photocurrent increases using PbBr2. The final films and devices are characterized by measuring photoluminescence, light absorption and J-V curves. In addition, they are analyzed by X-Ray Diffraction, Impedance Spectroscopy, Scanning Electron Microscopy and Energy Dispersive X-ray spectroscopy.



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