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dc.contributor.authorSharada, G.
dc.contributor.authorMahale, Pratibha
dc.contributor.authorKore, Bhushan P.
dc.contributor.authorMukherjee, Somdutta
dc.contributor.authorPavan, Mysore S.
dc.contributor.authorDe, Chandan
dc.contributor.authorGhara, Somnath
dc.contributor.authorSundaresan, A.
dc.contributor.authorPandey, Anshu
dc.contributor.authorRow, Tayur N. Guru
dc.contributor.authorSarma, D. D.
dc.identifier.citationSharada, 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
dc.identifier.citationJournal of Physical Chemistry Lettersen_US
dc.descriptionRestricted Accessen_US
dc.description.abstractIn 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.en_US
dc.publisherAmerican Chemical Societyen_US
dc.rights@American Chemical Society, 2016en_US
dc.subjectMaterials Scienceen_US
dc.subjectPerovskite Solar-Cellsen_US
dc.subjectOrganometal Halide Perovskitesen_US
dc.subjectMethylammonium Lead Iodideen_US
dc.subjectOrganic-Inorganic Perovskiteen_US
dc.subjectFerroelectric Polarizationen_US
dc.subjectHybrid Perovskitesen_US
dc.titleIs CH3NH3PbI3 Polar?en_US
Appears in Collections:Research Articles (Sundaresan A.)

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