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The long diffusion length of charge carriers in the CH3NH3PbI3 perovskite is one of the most relevant properties for explaining the high photovoltaic efficiency of perovskite solar cells. As a possible mechanism for the large diffusion length of electrons and holes, several authors suggested a reduced coulomb attraction of the carriers due to the formation of polarons. Here we performed continuous wave far-infrared photoinduced absorption (PIA) experiments on CH3NH3PbI3; spectral changes are associated with local deformation of the lattice around the photogenerated long-lived charges, a typical signature of photoinduced polarons. Ab initio calculations show confinement of charge carriers at the interface between structural domains characterized by a different tilting of the PbI6 octahedra. The differential IR spectrum between unperturbed and perturbed simulated structures shows a close pattern to the …
American Chemical Society
Publication date: 
22 Jun 2017

Tanja Ivanovska, Chiara Dionigi, Edoardo Mosconi, Filippo De Angelis, Fabiola Liscio, Vittorio Morandi, Giampiero Ruani

Biblio References: 
Volume: 8 Issue: 13 Pages: 3081-3086
The Journal of Physical Chemistry Letters