期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 22, 页码 4847-4852出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc01436d
关键词
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资金
- Department of Energy, Basic Energy Sciences, Division of Chemical Sciences, Biosciences, and Geosciences [DE-AC36-08GO28308]
- NREL
- hybrid perovskite solar cell program of the National Center for Photovoltaics - U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, Solar Energy Technologies Office
We report third-order nonlinear coefficient values and decay time kinetics vs. halide composition (CH3NH3PbBr3 and CH3NH3PbBr2I), temperature, and excitation wavelength. The maximum values of the third-order nonlinear susceptibility chi((3)) (similar to 1.6 x 10(-6) 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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