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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.

Author information

1
Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA.
2
Department of Chemistry, Columbia University, New York, New York 10027, USA.
3
Department of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USA.
4
The Institute for Theoretical and Applied Electrodynamics, The National University of Science and Technology, MISIS, Moscow 119049, Russia.
5
Landau Institute for Theoretical Physics, Moscow 119334, Russia.
6
Institute for Adv. Mater. and Devices for Nanotech., Rutgers University, Piscataway, New Jersey 08854, USA.

Abstract

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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