Proceedings of Perovskite Thin Film Photovoltaics (ABXPV17)
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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