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Related Concept Videos

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

674
Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.3K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
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Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
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Charge Carrier Recombination Dynamics in MAPb(BrCl1-)3 Single Crystals.

Zijie Xiao1, Tingting Tao2, Jingting Shu2

  • 1School of Physics and Materials Science, Guangzhou University, Guangzhou510006, China.

The Journal of Physical Chemistry Letters
|January 3, 2023
PubMed
Summary

Carrier recombination in mixed-halide perovskite crystals is key for optoelectronics. This study reveals hole trapping dominates photoluminescence, while electron trapping influences photoconductivity, with rates varying by bromine content.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Photochemistry

Background:

  • Understanding carrier recombination dynamics in metal-halide perovskites is crucial for advancing their photovoltaic and optoelectronic applications.
  • MAPb(BrxCl1-x)3 crystals are promising materials for these applications, but their charge carrier behavior requires detailed investigation.

Purpose of the Study:

  • To elucidate the carrier recombination mechanisms in MAPb(BrxCl1-x)3 single crystals.
  • To investigate the influence of bromine content on carrier trapping and detrapping processes.
  • To characterize the energy levels of trap states within the band gap.

Main Methods:

  • Steady-state photoluminescence (PL) spectroscopy.
  • Time-resolved photoluminescence (TRPL) spectroscopy.
  • Time-resolved microwave photoconductivity (TRMC) measurements.
  • Temperature-dependent PL studies.

Main Results:

  • TRPL in MAPb(BrxCl1-x)3 (x < 0.98) is primarily governed by hole trapping, whereas TRMC is influenced by electron trapping.
  • Both electron and hole trapping rates decrease with increasing bromine content in these crystals.
  • Temperature-dependent PL reveals shallow trap states (detrapping activation energy ~0.1 eV) and deep trap states (trapping activation energy ~0.4 eV) for holes.

Conclusions:

  • Carrier recombination in MAPb(BrxCl1-x)3 is a complex process involving distinct electron and hole trapping mechanisms.
  • Bromine incorporation tunes the trapping rates, offering a pathway for material optimization.
  • The presence of multiple trap states impacts charge carrier lifetimes and transport properties.