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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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.
Spin decoupling is usually achieved by...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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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.
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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1.1K
Deactivation Processes: Jablonski Diagram01:25

Deactivation Processes: Jablonski Diagram

637
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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Related Experiment Video

Updated: Jun 23, 2025

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
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Right On Time: Ultrafast Charge Separation Before Hybrid Exciton Formation.

Lukas Gierster1,2, Olga Turkina3, Jan-Christoph Deinert2

  • 1Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 14, 2024
PubMed
Summary

Organic/inorganic hybrid solar cells show promise, but ZnO performance lags. This study reveals delayed electron recapture at the ZnO interface, explaining low charge separation efficiency and suggesting design improvements for hybrid solar cells.

Keywords:
charge transferexcitonshybrid systemultrafast

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Physical Chemistry

Background:

  • Organic/inorganic hybrid systems are promising for solar cells, merging organic light absorption with inorganic charge transport.
  • Zinc oxide (ZnO) possesses ideal properties for light harvesting but shows lower charge separation efficiency compared to titanium dioxide (TiO2).
  • The reasons for ZnO's underperformance in hybrid solar cells have been a subject of ongoing research.

Purpose of the Study:

  • To investigate the fundamental processes limiting charge separation efficiency at organic/ZnO interfaces.
  • To identify and quantify the elementary steps responsible for suppressed charge separation in hybrid solar cells.
  • To provide insights for improving ZnO-based hybrid solar cell design.

Main Methods:

  • Utilized femtosecond time-resolved photoelectron spectroscopy to probe ultrafast dynamics.
  • Employed many-body ab initio calculations to model interfacial processes.
  • Quantified elementary steps governing charge separation and recombination at the organic/ZnO interface.

Main Results:

  • Confirmed efficient charge separation on ultrafast timescales (350 fs).
  • Identified delayed electron recapture at the interface occurring on a 100 ps timescale.
  • Observed subsequent trapping in a long-lived ( > 5 µs) hybrid exciton state (0.7 eV binding energy).

Conclusions:

  • Delayed electron recapture and trapping in hybrid excitons, not initial separation, cause apparent low efficiencies in organic/ZnO systems.
  • The findings offer a viable timeframe for implementing design modifications to enhance ZnO-based solar cell performance.
  • This research encourages re-evaluation of other hybrid systems previously dismissed due to poor charge separation.