Article

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

Y. ChenDepartment of Physics, Rutgers University, Piscataway, New Jersey 08854, USAHee Taek YiDepartment of Physics, Rutgers University, Piscataway, New Jersey 08854, USAXiaoxi WuDepartment of Chemistry, Columbia University, New York, New York 10027, USARoss HaroldsonDepartment of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USAYuri N. GartsteinDepartment of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USAYaroslav RodionovThe Institute for Theoretical and Applied Electrodynamics, The National University of Science and Technology, MISIS, Moscow 119049, RussiaK. S. TikhonovLandau Institute for Theoretical Physics, Moscow 119334, RussiaAnvar ZakhidovDepartment of Physics and NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75080, USAXiaoyang ZhuDepartment of Chemistry, Columbia University, New York, New York 10027, USAVitaly PodzorovDepartment of Physics, Rutgers University, Piscataway, New Jersey 08854, USA

2016en

ABI

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.

Identifiers

DOI: 10.1038/ncomms12253

Citations and references

Cited by 20 references

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