​Latest Nat. Mater.: Using vibration to promote electronic resonance for ultrafast vibration control of perovskite optoelectronic devices

• Vibrational control (VC) of photochemistry through optical stimulation of structural dynamics is an emerging concept that has only recently been demonstrated in model molecules in solution. Expanding VC into state-of-the-art materials may lead to new applications and improve the performance of optoelectronic devices. Metal halide perovskites are promising targets for VC due to their mechanical softness and rich vibrational motions in inorganic and organic sublattices.

  
  

  Artem A. Bakulin and others at Imperial College London demonstrated ultrafast VC for FAPbBr3 perovskite solar cells through intramolecular vibrations of formamidine cations using spectroscopy technology based on vibration-promoted electron resonance. The short (approximately 300 fs) time window of VC observed by the researchers highlights the rapid dynamics of coupling between cations and inorganic sublattices.

  
  

  
  

  First-principles modeling suggests that this coupling is mediated by hydrogen bonds that regulate the lead halide lattice and electronic states. Tuning the cation dynamics of this coupling can suppress nonradiative recombination in perovskites, thereby reducing voltage losses in photovoltaic cells. In the future, VC could be used to unlock new functionalities in ultrafast optical switches that time-division multiplex optical signals, as well as a powerful tool for studying electron-phonon coupling in perovskites and wider optoelectronic systems.

  
  
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• Gallop, N.P., Maslennikov, D.R., Mondal, N. et al. Ultrafast vibrational control of organohalide perovskite optoelectronic devices using vibrationally promoted electronic resonance. Nat. Mater. (2023).

  
  

  DOI：10.1038/s41563-023-01723-w

  
  

  https://doi.org/10.1038/s41563-023-01723-w

  
  

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