Reduced ion migration and enhanced photoresponse in cuboid crystals of methylammonium lead iodide perovskite
AuthorsZhumekenov, Ayan A
Mohammed, Omar F.
KAUST DepartmentChemical Science Program
Functional Nanomaterials Lab (FuNL)
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Material Science and Engineering
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Ultrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
Online Publication Date2018-11-28
Print Publication Date2019-01-30
Permanent link to this recordhttp://hdl.handle.net/10754/629852
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AbstractThe optoelectronic and photocatalytic properties of a number of semiconductor materials, including halide perovskites, have recently been found to be facet-dependent. While methylammonium lead iodide (CH3NH3PbI3) perovskite – an important material for energy applications – has shown facet-dependent electronic properties as well, most studies on CH3NH3PbI3 perovskite were performed on rhombo-dodecahedral (or rhombic) single crystals with the (200) and (112) facets exposed. In contrast, less is known about the electronic properties, including mixed conductivity behavior and possible in-plane anisotropy, of the (002) facet. Thus, we report a facile method for the growth of cuboid crystals of CH3NH3PbI3 perovskite with the (002) and (110) facets exposed. Two-terminal devices fabricated on the (002) facet demonstrate significantly improved charge transport and optoelectronic characteristics compared to those on the (200) facet of typical rhombic crystals, including: reduced ion migration, low dark current, and temporally-stable high photocurrents. These desirable characteristics of cuboid crystals are linked to their favorable growth conditions and preferred facet orientations. Our results provide a guidance for utilizing facets and crystal growth to achieve more efficient in-plane halide perovskite devices.
CitationZhumekenov AA, Haque MA, Yin J, El-Zohry AM, Lee KJ, et al. (2018) Reduced ion migration and enhanced photoresponse in cuboid crystals of methylammonium lead iodide perovskite. Journal of Physics D: Applied Physics. Available: http://dx.doi.org/10.1088/1361-6463/aaefdf.
SponsorsThe authors gratefully acknowledge the funding support provided by King Abdullah University of Science and Technology (KAUST).