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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Related Experiment Video

Updated: Dec 24, 2025

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films

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Nonlinear refraction in CH3NH3PbBr3 single crystals.

Christian Kriso, Markus Stein, Tobias Haeger

    Optics Letters
    |April 15, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We measured nonlinear optical properties of methylammonium lead bromide perovskite single crystals using femtosecond laser pulses. Results indicate that large nonlinear refractive indices in perovskites may stem from free carriers or quantum confinement, not just intrinsic electronic properties.

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    Area of Science:

    • Materials Science
    • Optics and Photonics
    • Solid-State Physics

    Background:

    • Methylammonium lead bromide (CH3NH3PbBr3) is an emerging perovskite material with potential applications in optoelectronics.
    • Understanding its nonlinear optical properties is crucial for device development.
    • Previous studies have indicated significant nonlinear responses in perovskite nanostructures.

    Purpose of the Study:

    • To quantitatively measure the nonlinear absorption and nonlinear refraction of CH3NH3PbBr3 single crystals.
    • To investigate the origin of the large nonlinear refractive index observed in perovskite materials.
    • To compare experimental results with theoretical models.

    Main Methods:

    • Utilized the Z-scan technique with femtosecond laser pulses to probe nonlinear optical phenomena.
    • Performed measurements at a wavelength of 1000 nm.
    • Employed the two-band model for theoretical analysis.

    Main Results:

    • Obtained a nonlinear absorption coefficient of 5.2 cm/GW.
    • Measured a nonlinear refractive index of +9.5 × 10-14 cm2/W.
    • The two-band model accurately reproduced the sign and magnitude of the experimental refractive nonlinearity.

    Conclusions:

    • The large nonlinear refractive index in perovskite nanostructures is unlikely due to intrinsically high bound-electronic nonlinearity.
    • Free carriers or quantum confinement effects are potential explanations for the observed large nonlinear refractive index.
    • Further research is needed to elucidate the precise mechanisms contributing to nonlinear optical properties in perovskites.