Third-order nonlinear optical properties of methylammonium lead halide perovskite films

Custom DOE used
Published on:
Authors: J. Mater. Chem. C, Volume 4; Pages 4847-4852; 2016
Abstract:

“We report third-order nonlinear coefficient values and decay time kinetics vs. halide composition (CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> and CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>2</sub>I), temperature, and excitation wavelength. The maximum values of the third-order nonlinear susceptibility χ<sup>(3)</sup> (∼1.6 × 10<sup>−6</sup> esu) are similar to or larger than many common third-order materials. The source of the nonlinearity is shown to be primarily excitonic in the tribromide film by virtue of its strong enhancement near the exciton resonance. Nonresonant excitation reduces the nonlinearity significantly, as does increasing the temperature. Substitution of one I for one Br also reduces the nonlinearity by at least one order of magnitude, presumably due to the lack of strong exciton resonance in the substituted form. The thin films are stable, highly homogenous (lacking significant light scattering), and simple and inexpensive to fabricate, making them potentially useful in a variety of optoelectronic applications in which wavelength selectivity is important.”

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Publication: Journal of Materials Chemistry C
Issue/Year: Johnson, Justin C.; Li, Zhen; Ndione, Paul F. & Zhu, Kai
DOI: 10.1039/C6TC01436D
Link: https://doi.org/10.1039/C6TC01436D

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