title: Extended carrier lifetimes and diffusion in hybrid perovskites revealed by Hall effect and photoconductivity measurements.
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.
authors.affiliation: Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: H T
authors.initials: HT
authors.lastname: Yi
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA.
authors.forename: X
authors.initials: X
authors.lastname: Wu
authors.affiliation: Department of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USA.
authors.forename: R
authors.initials: R
authors.lastname: Haroldson
authors.affiliation: Department of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USA.
authors.forename: Y N
authors.initials: YN
authors.lastname: Gartstein
authors.affiliation: The Institute for Theoretical and Applied Electrodynamics, The National University of Science and Technology, MISIS, Moscow 119049, Russia.
authors.forename: Y I
authors.initials: YI
authors.lastname: Rodionov
authors.affiliation: Landau Institute for Theoretical Physics, Moscow 119334, Russia.
authors.forename: K S
authors.initials: KS
authors.lastname: Tikhonov
authors.affiliation: 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.
authors.forename: A
authors.initials: A
authors.lastname: Zakhidov
authors.affiliation: Department of Chemistry, Columbia University, New York, New York 10027, USA.
authors.forename: X-Y
authors.initials: XY
authors.lastname: Zhu
authors.affiliation: Department of Physics, Rutgers University, Piscataway, New Jersey 08854, USA.|Institute for Adv. Mater. and Devices for Nanotech., Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: V
authors.initials: V
authors.lastname: Podzorov