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Nat Commun. 2016 Aug 1;7:12253. doi: 10.1038/ncomms12253.

Extended carrier lifetimes and diffusion in hybrid perovskites revealed by Hall effect and photoconductivity measurements.

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Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA.
Department of Chemistry, Columbia University, New York, New York 10027, USA.
Department of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USA.
The Institute for Theoretical and Applied Electrodynamics, The National University of Science and Technology, MISIS, Moscow 119049, Russia.
Landau Institute for Theoretical Physics, Moscow 119334, Russia.
Institute for Adv. Mater. and Devices for Nanotech., Rutgers University, Piscataway, New Jersey 08854, USA.


Impressive performance of hybrid perovskite solar cells reported in recent years still awaits a comprehensive understanding of its microscopic origins. In this work, the intrinsic Hall mobility and photocarrier recombination coefficient are directly measured in these materials in steady-state transport studies. The results show that electron-hole recombination and carrier trapping rates in hybrid perovskites are very low. The bimolecular recombination coefficient (10(-11) to 10(-10) cm(3) s(-1)) is found to be on par with that in the best direct-band inorganic semiconductors, even though the intrinsic Hall mobility in hybrid perovskites is considerably lower (up to 60 cm(2) V(-1) s(-1)). Measured here, steady-state carrier lifetimes (of up to 3 ms) and diffusion lengths (as long as 650 μm) are significantly longer than those in high-purity crystalline inorganic semiconductors. We suggest that these experimental findings are consistent with the polaronic nature of charge carriers, resulting from an interaction of charges with methylammonium dipoles.

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