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Related Concept Videos

Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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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.
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Enhanced Higher Harmonic Generation in Modified MAPbBr3-Cl Single Crystal by Additive Engineering.

Sarvani Jowhar Khanam1, Srinivasa Rao Konda2, Ravi Ketavath1

  • 1Solar Cells and Photonics Research Laboratory, School of Chemistry, University of Hyderabad, Hyderabad 500046, Telangana, India.

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This study explores how nitrogen-based additives affect higher harmonic generation in mixed-halide perovskite solar cells (MHSCs). Additives enhance crystal quality and optical properties, potentially improving device stability and performance.

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Area of Science:

  • Materials Science
  • Photonics
  • Solid-State Physics

Background:

  • Mixed-halide perovskite solar cells (MHSCs) offer tunable bandgaps and facile processing for photonics.
  • Commercialization is hindered by environmental instability (humidity, oxygen).
  • Higher harmonic generation (HHG) is a key optical property influenced by material characteristics.

Purpose of the Study:

  • To investigate the impact of nitrogen-based additives on HHG in MAPbBr3-xClx single crystals.
  • To understand how additives influence nanolevel crystallinity and morphology.
  • To explore additive engineering as a strategy for enhancing MHSC properties.

Main Methods:

  • Synthesis of MAPbBr3-xClx single crystals with varying nitrogen-based additives.
  • Characterization of morphological and optical properties.
  • Measurement of higher harmonic generation (HHG) under controlled conditions.

Main Results:

  • Nitrogen-based additives act as passivating agents, improving nanolevel crystallinity.
  • Additive engineering significantly impacts the morphological and optical properties of MHSCs.
  • Changes in additives alter the higher harmonic generation (HHG) efficiency.

Conclusions:

  • Additive engineering is a viable strategy to enhance the performance of mixed-halide perovskite materials.
  • Improved crystallinity and tailored optical properties through additives can mitigate stability issues.
  • This research paves the way for more robust and efficient perovskite-based photonic devices.