Photoexcitation Dynamics in Solution-Processed Formamidinium Lead Iodide Perovskite Thin Films for Solar Cell Applications
Maria Antonietta Loi a
a University of Groningen, The Netherlands, Nijenborgh, 4, Groningen, Netherlands
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Swansea, United Kingdom, 2016 June 29th - July 1st
Organizers: James Durrant, Henry Snaith and David Worsley
Invited Speaker Session, Maria Antonietta Loi, presentation 185
Publication date: 28th March 2016

Hybrid perovskites are one of the most promising materials for low-cost photovoltaic technology. However, the understanding of their physical properties has lagged behind the impressive improvement of power-conversion efficiency (>20%). In my presentation I will report about the optical properties of FAPbI3 perovskite films based on different precursor systems (the formamidinium iodide (FAI)/HPbI3, FAI/PbI2, and FAI/PbI2 with HI additive) are comparatively investigated as a function of temperature. Exciton binding energies of 8.1 meV for the high temperature phase and 18 meV for the low temperature phase are extracted. At room temperature, we found the lifetimes to vary from tens to hundreds nanoseconds. FAPbI3 film made from the new precursor, exhibits the longest lifetime of 439 ns, suggesting a lower number of defects and lower non-radiative recombination losses compared with FAPbI3 obtained with the other two precursors set. Importantly, photoluminescence spectra at room temperature show single peak, while, at liquid helium temperature, the emission features two peaks, the one at higher energy displaying a fast decay (



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