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Title: Is CH3NH3PbI3 Polar?
Authors: Sharada, G.
Mahale, Pratibha
Kore, Bhushan P.
Mukherjee, Somdutta
Pavan, Mysore S.
De, Chandan
Ghara, Somnath
Sundaresan, A.
Pandey, Anshu
Row, Tayur N. Guru
Sarma, D. D.
Keywords: Chemistry
Materials Science
Perovskite Solar-Cells
Organometal Halide Perovskites
Methylammonium Lead Iodide
Organic-Inorganic Perovskite
Ferroelectric Polarization
Hybrid Perovskites
Issue Date: 2016
Publisher: American Chemical Society
Citation: Sharada, G.; Mahale, P.; Kore, B. P.; Mukherjee, S.; Pavan, M. S.; De, C. D.; Ghara, S.; Sundaresan, A.; Pandey, A.; Row, T. N. G.; Sarma, D. D., Is CH3NH3PbI3 Polar? Journal of Physical Chemistry Letters 2016, 7 (13), 2412-2419
Journal of Physical Chemistry Letters
Abstract: In view of the continued controversy concerning the polar/nonpolar nature of the hybrid perovskite system, CH3NH3PbI3, we report the first investigation of a time resolved pump probe measurement of the second harmonic generation efficiency as well as using its more traditional form as a sensitive probe of the absence/presence of the center of inversion in the system both in its excited and ground states, respectively. Our results clearly show that SHG efficiency, if nonzero, is below the limit of detection, strongly indicative of a nonpolar or centrosymmetric structure. Our results on the same samples, based on temperature dependent single crystal X-ray diffraction and P-E loop measurements, are entirely consistent with the above conclusion of a centrosymmetric structure for this compound in all three phases, namely the high temperature cubic phase, the intermediate temperature tetragonal phase and the low temperature orthorhombic phase. It is important to note that all our experimental probes are volume averaging and performed on bulk materials, suggesting that basic material properties of CH3NH3PbI3 are consistent with a centrosymmetric, nonpolar structure.
Description: Restricted Access
ISSN: 1948-7185
Appears in Collections:Research Articles (Sundaresan A.)

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