%0 Journal Article %1 doi:10.1021/acs.jpclett.7b01156 %A Ivanovska, Tanja %A Dionigi, Chiara %A Mosconi, Edoardo %A De Angelis, Filippo %A Liscio, Fabiola %A Morandi, Vittorio %A Ruani, Giampiero %D 2017 %J The Journal of Physical Chemistry Letters %K perovskite %N 13 %P 3081-3086 %R 10.1021/acs.jpclett.7b01156 %T Long-Lived Photoinduced Polarons in Organohalide Perovskites %U http://dx.doi.org/10.1021/acs.jpclett.7b01156 %V 8 %X 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 experimental PIA. Positive and negative charges are confined in different varieties of the perovskites coherent with the low recombination and long diffusion length of photogenerated carriers.

@article{doi:10.1021/acs.jpclett.7b01156, abstract = { 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 experimental PIA. Positive and negative charges are confined in different varieties of the perovskites coherent with the low recombination and long diffusion length of photogenerated carriers. }, added-at = {2017-07-24T14:27:17.000+0200}, author = {Ivanovska, Tanja and Dionigi, Chiara and Mosconi, Edoardo and De Angelis, Filippo and Liscio, Fabiola and Morandi, Vittorio and Ruani, Giampiero}, biburl = {https://www.bibsonomy.org/bibtex/2484b2a509212427d8de31d336acdf6a4/woepps}, doi = {10.1021/acs.jpclett.7b01156}, eprint = {http://dx.doi.org/10.1021/acs.jpclett.7b01156}, interhash = {f789b2dc1ce1c8a869655e904f8fd6ad}, intrahash = {484b2a509212427d8de31d336acdf6a4}, journal = {The Journal of Physical Chemistry Letters}, keywords = {perovskite}, note = {PMID: 28621140}, number = 13, pages = {3081-3086}, timestamp = {2017-07-24T14:27:17.000+0200}, title = {Long-Lived Photoinduced Polarons in Organohalide Perovskites}, url = {http://dx.doi.org/10.1021/acs.jpclett.7b01156}, volume = 8, year = 2017 }