Pure crystal orientation and anisotropic charge transport in large-area hybrid perovskite films

Namchul Cho, Feng Li, Bekir Turedi, Lutfan Sinatra, Smritakshi P. Sarmah, Manas R. Parida, Makhsud I. Saidaminov, Banavoth Murali, Victor M. Burlakov, Alain Goriely, Omar F. Mohammed, Tom Wu and Osman M. Bakr ()
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Namchul Cho: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Feng Li: Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Bekir Turedi: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Lutfan Sinatra: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Smritakshi P. Sarmah: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Manas R. Parida: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Makhsud I. Saidaminov: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Banavoth Murali: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Victor M. Burlakov: Mathematical Institute, University of Oxford
Alain Goriely: Mathematical Institute, University of Oxford
Omar F. Mohammed: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Tom Wu: Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)
Osman M. Bakr: KAUST Solar Center, Materials Science and Engineering, King Abdullah University of Science and Technology (KAUST)

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract Controlling crystal orientations and macroscopic morphology is vital to develop the electronic properties of hybrid perovskites. Here we show that a large-area, orientationally pure crystalline (OPC) methylammonium lead iodide (MAPbI3) hybrid perovskite film can be fabricated using a thermal-gradient-assisted directional crystallization method that relies on the sharp liquid-to-solid transition of MAPbI3 from ionic liquid solution. We find that the OPC films spontaneously form periodic microarrays that are distinguishable from general polycrystalline perovskite materials in terms of their crystal orientation, film morphology and electronic properties. X-ray diffraction patterns reveal that the film is strongly oriented in the (112) and (200) planes parallel to the substrate. This film is structurally confined by directional crystal growth, inducing intense anisotropy in charge transport. In addition, the low trap-state density (7.9 × 1013 cm−3) leads to strong amplified stimulated emission. This ability to control crystal orientation and morphology could be widely adopted in optoelectronic devices.

Date: 2016
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DOI: 10.1038/ncomms13407

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