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A molecular interaction-diffusion framework for predicting organic solar cell stability.

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Morphological stability in organic solar cells (OSCs) is improved by understanding how non-fullerene small-molecule acceptors (NF-SMAs) interact with donor polymers. Higher thermodynamic instability leads to greater kinetic stabilization, enhancing device lifetime.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Organic solar cells (OSCs) efficiency has rapidly increased due to non-fullerene small-molecule acceptors (NF-SMAs).
  • Morphological stability is crucial for OSC device lifetime, but intermolecular interactions governing this are not well understood.
  • Understanding these interactions is key to improving NF-SMA based OSCs.

Purpose of the Study:

  • Investigate the fundamental intermolecular interactions in NF-SMA/polymer blends.
  • Elucidate the relationship between these interactions, material properties, and morphological stability in OSCs.
  • Develop predictive models for device stability.

Main Methods:

  • Studied the diffusion of NF-SMAs in donor polymers using Arrhenius behavior analysis.
  • Quantified enthalpic interaction parameters (χH) between polymers and NF-SMAs.
  • Correlated diffusion activation energy (Ea) with molecular self-interaction properties and thermal/mechanical characteristics.

Main Results:

  • NF-SMA diffusion follows Arrhenius behavior, with activation energy (Ea) linearly scaling with enthalpic interaction parameters (χH).
  • Thermodynamically unstable (high χ) systems demonstrated enhanced kinetic stabilization.
  • Established quantitative property-function relationships linking material properties to diffusion and morphological stability.

Conclusions:

  • Intermolecular interactions significantly influence the kinetic stabilization and morphological stability of NF-SMA based OSCs.
  • Material's thermal and mechanical properties can predict diffusion rates and device stability.
  • This work provides a framework for designing more stable and efficient organic solar cells.