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G S, Mahale P, Kore BP, et al. Is CH3NH3PbI3 Polar?. J Phys Chem Lett. 2016;7(13):2412-9doi: 10.1021/acs.jpclett.6b00803.
G, S., Mahale, P., Kore, B. P., Mukherjee, S., Pavan, M. S., De, C., Ghara, S., Sundaresan, A., Pandey, A., Guru Row, T. N., & Sarma, D. D. (2016). Is CH3NH3PbI3 Polar?. The journal of physical chemistry letters, 7(13), 2412-9. https://doi.org/10.1021/acs.jpclett.6b00803
G, Sharada, et al. "Is CH3NH3PbI3 Polar?." The journal of physical chemistry letters vol. 7,13 (2016): 2412-9. doi: https://doi.org/10.1021/acs.jpclett.6b00803
G S, Mahale P, Kore BP, Mukherjee S, Pavan MS, De C, Ghara S, Sundaresan A, Pandey A, Guru Row TN, Sarma DD. Is CH3NH3PbI3 Polar?. J Phys Chem Lett. 2016 Jul 07;7(13):2412-9. doi: 10.1021/acs.jpclett.6b00803. Epub 2016 Jun 15. PMID: 27282976.
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J Phys Chem Lett. 2016 Jul 07;7(13):2412-9. doi: 10.1021/acs.jpclett.6b00803. Epub 2016 Jun 15.

Is CH3NH3PbI3 Polar?.

The journal of physical chemistry letters

Sharada G, Pratibha Mahale, Bhushan P Kore, Somdutta Mukherjee, Mysore S Pavan, Chandan De, Somnath Ghara, A Sundaresan, Anshu Pandey, Tayur N Guru Row, D D Sarma

Affiliations

  1. Solid State and Structural Chemistry Unit, Indian Institute of Science , Bengaluru-560012, India.
  2. Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru-560064, India.

PMID: 27282976 DOI: 10.1021/acs.jpclett.6b00803

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.

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